Question 1: Palette 1/91

NEET 2026 MCQ

Which of the following equations depicts Verhulst-Pearl logistic population growth?

A

$\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left(\frac{\mathrm{K}+\mathrm{N}}{\mathrm{K}}\right)$.

B

$\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left(\frac{\mathrm{K}-\mathrm{N}}{\mathrm{K}}\right)$

C

$\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left(\frac{\mathrm{K}-\mathrm{N}}{\mathrm{N}}\right)$

D

$\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left(\frac{\mathrm{K}}{\mathrm{K}-\mathrm{N}}\right)$

Question 2: Palette 2/91

NEET 2026 MCQ

Which one of the following is an appropriate example of sexual deceit?

A

Female wasp and fig

B

Ophrys and bumblebee

C

Sea anemone and clown fish

D

Cuckoo and crow

Question 3: Palette 3/91

NEET 2026 MCQ

Choose the correct statements regarding population interactions between two species.

A. In both parasitism and commensalism, only one species benefits and the other species is harmed.

B. Both species benefit in mutualism.

C. Both species benefit in commensalism.

D. In parasitism, only one species benefits and the other species is harmed.

E. In amensalism, one species is harmed and the other is unaffected.

Choose the correct answer from the options given below:

A

B and E only

B

A and B only

C

B, D and E only

D

A and D only

Question 4: Palette 4/91

NEET 2026 MCQ

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason $\mathbf{R}$.

Assertion A : Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced.

Reason R: Goats were more efficient at browsing than Abingdon tortoise.

In the light of the above statements, choose the most appropriate answer from the options given below:

A

$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct

B

Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

C

Both $\mathbf{A}$ and $\mathbf{R}$ are correct but $\mathbf{R}$ is not the correct explanation of $\mathbf{A}$

D

$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct

Question 5: Palette 5/91

NEET 2026 MCQ

Consider a population of 10 million cells. Given the per-capita birth rate of 0.002 (per unit time) and the percapita death rate of 0.002 (per unit time), the expected number of cells after 10 generations is $\_\_\_\_$ .

A

100 million

B

1 million

C

5 million

D

10 million

Question 6: Palette 6/91

NEET 2026 MCQ

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : The logistic growth model of populations is considered more realistic than the exponential growth model.

Reason R: Resources are finite.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct

B

Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

C

Both $\mathbf{A}$ and $\mathbf{R}$ are correct but $\mathbf{R}$ is not the correct explanation of $\mathbf{A}$

D

$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct

Question 7: Palette 7/91

NEET 2026 MCQ

$ \text { Match List-I with List-II. } $

	List-I		List-II
A.	Both species are harmed	I.	Predation
B.	One species is harmed and the other is benefited	II.	Mutualism
C.	Both species are benefited	III.	Competition
D.	One is benefited while the other has no effect	IV.	Commensalism

Choose the correct answer from the options given below:

A

A-III, B-I, C-II, D-IV

B

A-III, B-IV, C-II, D-I

C

A-I, B-II, C-III, D-IV

D

A-II, B-I, C-IV, D-III

Question 8: Palette 8/91

NEET 2025 MCQ

Epiphytes that are growing on a mango branch is an example of which of the following?

A

Predation

B

Amensalism

C

Commensalism

D

Mutualism

Question 9: Palette 9/91

NEET 2025 MCQ

Which one of the following equations represents the Verhulst-Pearl Logistic Growth of population?

A

$\frac{d N}{d t}=r N\left(\frac{N-K}{N}\right)$

B

$\frac{d N}{d t}=N\left(\frac{r-K}{K}\right)$

C

$\frac{d N}{d t}=r\left(\frac{K-N}{K}\right)$

D

$\frac{d N}{d t}=r N\left(\frac{K-N}{K}\right)$

Question 10: Palette 10/91

NEET 2024 MCQ

When will the population density increase, under special conditions? When the number of :

A

Deaths exceeds number of births and also number of emigrants equals number of immigrants.

B

Births plus number of immigrants equals number of deaths plus number of emigrants.

C

Births plus number of emigrants is more than the number of deaths plus number of immigrants.

D

Births plus number of immigrants is more than the sum of number of deaths and number of emigrants.

Question 11: Palette 11/91

NEET 2024 MCQ

Match List-I with List-II:

	List - I		List - II
(A)	Predator	(I)	Ophrys
(B)	Mutualism	(II)	Pisaster
(C)	Parasitism	(III)	Female wasp and fig
(D)	Sexual deceit	(IV)	Plasmodium

Chose the correct answer from the options given below:

A

A-III, B-II, C-I, D-IV

B

A-IV, B-I, C-II, D-III

C

A-II, B-III, C-I, D-IV

D

A-II, B-III, C-IV, D-I

Question 12: Palette 12/91

NEET 2024 MCQ

Match List-I with List-II.

	List - I		List - II
(A)	Migratory flamingoes and resident fish in South American lakes	(I)	Interference competition
(B)	Abingdon tortoise became extinct after introduction of goats in their habitat	(II)	Competitive release
(C)	Chathamalus expands its distributional range in the absence of Balanus	(III)	Resource Partitioning
(D)	Five closely related species of Warblers feeding in different locations on same tree	(IV)	Interspecific competition

Choose the correct answer from the options given below:

A

A-I, B-IV, C-III, D-II

B

A-IV, B-I, C-II, D-III

C

A-III, B-1, C-II, D-IV

D

A-II, B-IV, C-III, D-I

Question 13: Palette 13/91

NEET 2024 MCQ

What do 'a' and 'b' represent in the following population growth curve?

A

‘a’ represents exponential growth when responses are not limiting the growth; and ‘b’ represents logistic growth when responses are limiting the growth.

B

‘a’ represents logistic growth when responses are not limiting the growth; ‘b’ represents exponential growth when responses are limiting the growth.

C

‘a’ represents carrying capacity and ‘b’ shows logistic growth when responses are limiting the growth.

D

‘a’ represents exponential growth when responses are not limiting the growth and ‘b’ shows carrying capacity.

Question 14: Palette 14/91

NEET 2024 MCQ

The equation of Verhulst-Pearl logistic growth is $\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left[\frac{\mathrm{K}-\mathrm{N}}{\mathrm{K}}\right]$. From this equation, $\mathrm{K}$ indicates:

A

Intrinsic rate of natural increase

B

Biotic potential

C

Carrying capacity

D

Population density

Question 15: Palette 15/91

NEET 2024 MCQ

Which one of the following factors will not affect the Hardy-Weinberg equilibrium?

A

Genetic recombination

B

Genetic drift

C

Gene migration

D

Constant gene pool

Question 16: Palette 16/91

NEET 2024 MCQ

Given below are two statements:

Statement I: Gause's competitive exclusion principle states that two closely related species competing for different resources cannot exist indefinitely.

Statement II: According to Gause's principle, during competition, the inferior will be eliminated. This may be true if resources are limiting.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are true.

B

Both Statement I and Statement II are false.

C

Statement I is true but Statement II is false.

D

Statement I is false but Statement II is true.

Question 17: Palette 17/91

NEET 2023 MCQ

Plants offer rewards to animals in the form of pollen and nectar and the animals facilitate the pollination process. This is an example of :

A

Amensalism

B

Competition

C

Commensalism

D

Mutualism

Question 18: Palette 18/91

NEET 2023 MCQ

If there are 250 snails in a pond, and within a year their number increases to 2500 by reproduction. What should be their birth rate per snail per year ?

A

10

B

9

C

25

D

15

Question 19: Palette 19/91

NEET 2023 MCQ

Given below are two statements:

Statement I : Gause’s ‘Competitive Exclusion Principle’ states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually.

Statement II : In general, carnivores are more adversely affected by competition than herbivores.

In the light of the above statements, choose the correct answer from the options given below:

A

Both Statement I and Statement II are false.

B

Statement I is correct Statement II is false.

C

Statement I is incorrect but Statement II is true.

D

Both Statement I and Statement II are true.

Question 20: Palette 20/91

NEET 2023 MCQ

Match List I with List II.

	List I (Interacting species)		List II (Name of interaction)
(A)	A Leopard and a Lion in a forest/grassland	(I)	Competition
(B)	A Cuckoo laying egg in a Crow's nest	(II)	Brood parasitism
(C)	Fungi and root of a higher plant in Mycorrhizae	(III)	Mutualism
(D)	A cattle egret and a Cattle in a field	(IV)	Commensalism

Choose the correct answer from the options given below.

A

A-I, B-II, C-IV, D-III

B

A-III, B-IV, C-I, D-II

C

A-II, B-III, C-I, D-IV

D

A-I, B-II, C-III, D-IV

Question 21: Palette 21/91

NEET 2023 MCQ

Match List I with List II.

	List I		List II
(A)	Logistic growth	(I)	Unlimited resource availability condition
(B)	Exponential growth	(II)	Limited resource availability condition
(C)	Expanding age pyramid	(III)	The percent individuals of pre-reproductive age is largest followed by reproductive and post reproductive age groups
(D)	Stable age pyramid	(IV)	The percent individuals of pre-reproductive and reproductive age group are same

Choose the correct answer from the options given below:

A

A-II, B-III, C-I, D-IV

B

A-II, B-IV, C-I, D-III

C

A-II, B-IV, C-III, D-I

D

A-II, B-I, C-III, D-IV

Question 22: Palette 22/91

NEET 2022 MCQ

Which one of the following statements cannot be connected to Predation?

A

It helps in maintaining species diversity in a community

B

It might lead to extinction of a species

C

Both the integrating species are negatively impacted

D

It is necessitated by nature to maintain the ecological balance

Question 23: Palette 23/91

NEET 2022 MCQ

While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, ($-$) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one specifies and ($-$) for another specifies involved in the interaction?

A

Predation

B

Amensalim

C

Commensalism

D

Competition

Question 24: Palette 24/91

NEET 2022 MCQ

If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is ___________ individuals per Drosophila per week.

A

0.1

B

10

C

1.0

D

zero

Question 25: Palette 25/91

NEET 2021 MCQ

Match List-I with List-II

	List-I		List-II
(a)	Allen's Rule	(i)	Kangaroo rat
(b)	Physiological adaptation	(ii)	Desert lizard
(c)	Behavioural adaptation	(iii)	Marine fish at depth
(d)	Biochemical adaptation	(iv)	Polar seal

Choose the correct answer from the options given below.

A

(a)	(b)	(c)	(d)
(iv)	(iii)	(ii)	(i)

B

(a)	(b)	(c)	(d)
(iv)	(ii)	(iii)	(i)

C

(a)	(b)	(c)	(d)
(iv)	(i)	(iii)	(ii)

D

(a)	(b)	(c)	(d)
(iv)	(i)	(ii)	(iii)

Question 26: Palette 26/91

NEET 2021 MCQ

Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

A

Predation

B

Resource partitioning

C

Competitive release

D

Mutualism

Question 27: Palette 27/91

NEET 2021 MCQ

Amensalism can be represented as :

A

Species A (+) ; Species B (0)

B

Species A ($-$); Species B (0)

C

Species A (+); Species B (+)

D

Species A ($-$); Species B ($-$)

Question 28: Palette 28/91

NEET 2021 MCQ

In the exponential growth equation
N_t = N₀e^rt, e represents

A

The base of geometric logarithms

B

The base of number logarithms

C

The base of exponential logarithms

D

The base of natural logarithms

Question 29: Palette 29/91

NEET 2020 MCQ

The process of growth is maximum during

A

Log phase

B

Lag phase

C

Dormancy

D

Senescence

Question 30: Palette 30/91

NEET 2020 MCQ

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

A

Nutritive value

B

Growth response

C

Effect on reproduction

D

Defence action

Question 31: Palette 31/91

NEET 2020 MCQ

Which of the following is not an attribute of a population?

A

Natality

B

Sex ratio

C

Mortality

D

Species interaction

Question 32: Palette 32/91

NEET 2019 MCQ

The Earth summit held in Rio de Janeiro in 1992 was called :

A

to assess threat posed to native species by invasive weed species

B

for immediate steps to discontinue use of CFCs that were damaging the ozone layer

C

to reduce CO₂ emissions and global warming

D

for conservation of biodiversity and sustainable utilization of its benefits

Question 33: Palette 33/91

NEET 2019 MCQ

Match Column-I with Column –II.

Column - I	Column - II
(a) Saprophyte	(i) Symbiotic association or fungi with plant roots
(b) Parasite	(ii) Decomposition of dead organic materials
(c) Lichens	(iii)Living on living plants of animals
(d) Mycorrhiza	(iv) Symbiotic association of algae and fungi

Choose the correct answer from the options given below :

A

(a)	(b)	(c)	(d)
(i)	(ii)	(iii)	(iv)

B

(a)	(b)	(c)	(d)
(iii)	(ii)	(i)	(iv)

C

(a)	(b)	(c)	(d)
(ii)	(i)	(iii)	(iv)

D

(a)	(b)	(c)	(d)
(ii)	(iii)	(iv)	(i)

Question 34: Palette 34/91

NEET 2018 MCQ

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

A

Hydrilla

B

Yucca

C

Banana

D

Viola

Question 35: Palette 35/91

NEET 2018 MCQ

Which one of the following population interactions is widely used in medical science for the production of antibiotics?

A

Commensalism

B

Mutualism

C

Parasitism

D

Amensalism

Question 36: Palette 36/91

NEET 2018 MCQ

In a growing population of a country,

A

pre-reproductive individuals are more than the reproductive individuals

B

reproductive individuals are less than the post-reproductive individuals

C

reproductive and pre-reproductive individuals are equal in number

D

pre-reproductive individuals are less than the reproductive individuals.

Question 37: Palette 37/91

NEET 2018 MCQ

Natality refers to

A

death rate

B

birth rate

C

number of individuals leaving the habitat

D

number of individuals entering a habitat

Question 38: Palette 38/91

NEET 2018 MCQ

Niche is

A

all the biological factors in the organism’s environment

B

the physical space where an organism lives

C

the range of temperature that the organism needs to live

D

the functional role played by the organism where it lives

Question 39: Palette 39/91

NEET 2018 MCQ

Pneumatophores occur in

A

halophytes

B

free-floating hydrophytes

C

carnivorous plants

D

submerged hydrophytes

Question 40: Palette 40/91

NEET 2017 MCQ

Asymptote in a logistic growth curve is obtained when :

A

K > N

B

The value of 'r' approaches zero

C

K< N

D

K = N

Question 41: Palette 41/91

NEET 2017 MCQ

Plants which produce characteristic pneumatophores and show vivipary belong to :

A

Halophytes

B

Psammophytes

C

Hydrophytes

D

Mesophytes

Question 42: Palette 42/91

NEET 2017 MCQ

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :

A

Grassland

B

Tropical Savannah

C

Temperate Forest

D

Tropical Rain Forest

Question 43: Palette 43/91

NEET 2017 MCQ

Mycorrhizae are the example of :

A

Fungistasis

B

Antibiosis

C

Mutualism

D

Amensalism

Question 44: Palette 44/91

NEET 2016 MCQ

Which of the following is correct for r-selected species ?

A

Small number of progeny with small size

B

Small number of progeny with large size

C

Large number of progeny with small size

D

Large number of progeny with large size

Question 45: Palette 45/91

NEET 2016 MCQ

If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to

A

parasitism

B

commensalism

C

mutualism

D

amensalism

Question 46: Palette 46/91

NEET 2016 MCQ

The principle of competitive exclusion was stated by

A

MacArthur

B

G. F. Gause

C

Verhulst & Pearl

D

C. Darwin

Question 47: Palette 47/91

NEET 2016 MCQ

It is much easier for a small animals to run uphill than for a large animal, because -

A

The efficiency of muscles in large animals is less than in the small animals

B

Smaller animals have a higher metabolic rate

C

It is easier to carry a small body weight

D

Small animals have a lower O₂ requirement

Question 48: Palette 48/91

NEET 2016 MCQ

When does the growth rate of a population following the logistic model equal zero?
The logistic model is given as dN/dt = rN(1-N/K)

A

When death rate is greater than birth rate.

B

When N/K equals zero.

C

When N/K is exactly one.

D

When N nears the carrying capacity of the habitat.

Question 49: Palette 49/91

NEET 2016 MCQ

Gause's principle of competitive exclusion states that -

A

Larger organisms exclude smaller ones through competition

B

More abundant species will exclude the less abundant species through competition

C

Competition for the same resources excludes species having different food preferences

D

No two species can occupy the same niche indefinitely for the same limiting resources

Question 50: Palette 50/91

NEET 2015 MCQ

In which of the following interactions both partners are adversely affected?

A

Competition

B

Predation

C

Mutualism

D

Parasitism

Question 51: Palette 51/91

NEET 2015 MCQ

An association of individuals of different species living in the same habitat and having functional interactions is -

A

Ecological niche

B

Ecosystem

C

Population

D

Biotic community

Question 52: Palette 52/91

NEET 2015 MCQ

The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that:

A

Population B competed more successfully for food than population A

B

Population A consumed the members of population B

C

Both plant populations in this habitat decreased

D

Population A produced more offspring than population B

Question 53: Palette 53/91

NEET 2014 MCQ

Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:

A

Keolado National Park

B

Meghalaya

C

Corbett National Park

D

Western Ghat

Question 54: Palette 54/91

NEET 2013 MCQ

Benthic organisms are affected most by :

A

Surface turbulence of water

B

Water-holding capacity of soil

C

Light reaching the forest floor

D

Sediment characteristics of aquatic ecosystems

Question 55: Palette 55/91

NEET 2013 MCQ

Which one of the following is not a parasitic adaptation ?

A

Loss of digestive organs

B

Loss of unnecessary sense organs

C

Development of adhesive organs

D

Loss of reproductive capacity

Question 56: Palette 56/91

NEET 2013 MCQ

The age pyramid with broad base indicates :

A

high percentage of young individuals

B

high percentage of old individuals

C

a stable population

D

low percentage of young individuals

Question 57: Palette 57/91

NEET 2013 MCQ

A biologist studied the population of rats in a barn, He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

A

15

B

05

C

10

D

zero

Question 58: Palette 58/91

NEET 2013 MCQ

Besides paddy fields, cyanobacteria are also found inside vegetative part of :

A

Cycus

B

Psilotum

C

Pinus

D

Equisetum

Question 59: Palette 59/91

NEET 2013 MCQ

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

A

Commensalism

B

Commensalism

C

Ectoparasitism

D

Symbiosis

Question 60: Palette 60/91

NEET 2012 MCQ

Cuscuta is an example of :

A

Ectoparasitism

B

Predation

C

Endoparasitism

D

Brood parasitism

Question 61: Palette 61/91

NEET 2011 MCQ

The logistic population growth is expressed by the equation :

A

$dt/dN = Nr\left( {{{K - N} \over K}} \right)$

B

$dN/dt = rN\left( {{{K - N} \over K}} \right)$

C

$dN/dt = rN\left( {{{N - K} \over N}} \right)$

D

$dN/dt = rN$

Question 62: Palette 62/91

NEET 2011 MCQ

Which one of the following is categorised as a parasite in true sense ?

A

The female anopheles bites and sucks blood from humans

B

Head louse living on the human scalp as well as laying eggs on human hair

C

The cuckoo (koel) lays its eggs in crow's nest

D

Human foetus developing inside the uterus draws nourishment from the mother

Question 63: Palette 63/91

NEET 2011 MCQ

What type of human population is represented by the following age pyramid ?

A

Declining population

B

Vanishing population

C

Expanding population

D

Stable population

Question 64: Palette 64/91

NEET 2011 MCQ

Consider the following four conditions (a – d) and select the correct pair of them as adaptation to environment in desert lizards.
The conditions :
(a) burrowing in soil to escape high temperature
(b) losing heat rapidly from the body during high temperature
(c) bask in sun when temperature is low
(d) insulating body due to thick fatty dermis

A

(c), (d)

B

(b), (d)

C

(a), (c)

D

(a), (b)

Question 65: Palette 65/91

NEET 2011 MCQ

Large Woody Vines are more commonly found in

A

Mangroves

B

Tropical rainforests

C

Alpine forests

D

Temperate forests

Question 66: Palette 66/91

NEET 2010 MCQ

Which one of the following is most appropriately defined ?

A

Parasite is an organism which always lives inside the body of other organism and may kill it.

B

Host is an organism which provides food to another organism.

C

Amensalism is a relationship in which one species is benefited where as the other is unaffected

D

Predator is an organism that catches and kills other organism for food.

Question 67: Palette 67/91

NEET 2010 MCQ

Which one of the following is one of the characteristics of a biological community?

A

Mortality

B

Sex-ratio

C

Stratification

D

Natality

Question 68: Palette 68/91

NEET 2010 MCQ

The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do a, b and c represent respectively –

A

(a) $ \to $ partial regulator, (b) $ \to $ regulator, (c) $ \to $ conformer

B

(a) $ \to $ conformer, (b) $ \to $ regulator, (c) $ \to $ partial regulator

C

(a) $ \to $ regulator, (b) $ \to $ conformer, (c) $ \to $ partial regulator

D

(a) $ \to $ regulator, (b) $ \to $ partial regulator, (c) $ \to $ conformer

Question 69: Palette 69/91

NEET 2009 MCQ

A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations A and B twenty years apart. Select the correct interpretation about them : –

A

"A" is more recent shows slight reduction in the growth rate

B

"B" is more recent showing that population is very young

C

"A" is the earlier pyramid and no change has occurred in the growth rate

D

"B" is earlier pyramid and shows stabilized growth rate

Question 70: Palette 70/91

NEET 2009 MCQ

Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of :

A

Xerophytes

B

Epiphytes

C

Hydrophytes

D

Mesophytes

Question 71: Palette 71/91

NEET 2008 MCQ

Consider the following four statements (1-4) about certain desert animals such as kangaroo-rat.
(i) They have dark colour and high rate of reproduction and excrete solid urine
(ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs
(iii) They feed on dry seeds and do not required drinking water
(iv) They excrete very concentrated urine and do not use water to regulate body temperature
Out of these four, which two are correct-

A

(i) and (ii)

B

(ii) and (iii)

C

(iii) and (i)

D

(iii) and (iv)

Question 72: Palette 72/91

NEET 2008 MCQ

Quercus species are the dominant component in:

A

Temperate deciduous forests

B

Alpine forests

C

Scrub forests

D

Tropical rain forests

Question 73: Palette 73/91

NEET 2007 MCQ

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:-

A

A normal distribution

B

a T-shaped curve

C

A skewed curve

D

A bi-modal distribution

Question 74: Palette 74/91

NEET 2007 MCQ

The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show ?

A

The food plants mature and die at the end of the rainy season

B

The population of its predators increases enormously

C

Its population growth curve is of J-type

D

S-shaped or sigmoid growth of this insect

Question 75: Palette 75/91

NEET 2007 MCQ

Geometric representation of age structure is a characteristic of :-

A

Biotic community

B

Landscape

C

Ecosystem

D

Population

Question 76: Palette 76/91

NEET 2007 MCQ

A high density of elephant population in an area can result in :-

A

Mutualism

B

Interspecific competition

C

Predation on one another

D

Intraspecific competition

Question 77: Palette 77/91

NEET 2006 MCQ

Niche overlap indicates-

A

Sharing of one or more resources between the two species

B

Mutualism between two species

C

Active cooperation between two species

D

Two different parasites on the same host

Question 78: Palette 78/91

NEET 2006 MCQ

The formula for exponential population growth is-

A

dN/dt = rN

B

dt/dN = rN

C

rN/dN = dt

D

dN/rN = dt

Question 79: Palette 79/91

NEET 2005 MCQ

Which one of the following pairs in mismatched ?

A

Tundra - permafrost

B

Savanna - acacia trees

C

Prairie - epiphytes

D

Coniferous forest - evergreen trees

Question 80: Palette 80/91

NEET 2005 MCQ

At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation -

A

40^o North and South

B

42${1 \over 2} ^ o$ North and South

C

66^o North and South

D

22${1 \over 2} ^ o$ North and South

Question 81: Palette 81/91

NEET 2005 MCQ

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example

A

Poison fangs in snakes

B

Enlargement of body size by swallowing air in puffer fish

C

Colour change in chameleon

D

Melanism in moths

Question 82: Palette 82/91

NEET 2005 MCQ

More than 70% of world's fresh water is contained in –

A

Polar ice

B

Greenland

C

Antarctica

D

Glaciers and Mountains

Question 83: Palette 83/91

NEET 2004 MCQ

The maximum growth rate occurs in :-

A

Exponential phase

B

Stationary phase

C

Senescent phase

D

Lag phase

Question 84: Palette 84/91

NEET 2004 MCQ

What is a keystone species ?

A

A dominant species that constitutes a large proportion of the biomass and which affects many other species

B

A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival

C

A common species that has plenty of biomass, yet has a fairly low impact on the community's organization

D

A rare species that has minimal impact on the biomass and on other species in the community

Question 85: Palette 85/91

NEET 2004 MCQ

Certain characteristic demographic features of developing countries are -

A

High fertility, low or rapidly falling mortality rate, rapid population growth and a very young age distribution

B

High mortality high density, uneven population growth and a very old age distribution

C

High fertility, high density, rapidly rising mortality rate and very young age distribution

D

High infant mortality, low fertility, uneven population growth and a very young age distribution

Question 86: Palette 86/91

NEET 2004 MCQ

In which one of the following habitats does the diurnal temperature of soil surface vary most ?

A

Grassland

B

Desert

C

Shrub land

D

Forest

Question 87: Palette 87/91

NEET 2004 MCQ

In which of the following pairs is the specific characteristic of a soil not correctly matched ?

A

Chernozems – Richest soil in the world

B

Laterite – Contains aluminium compound

C

Terra rossa – Most suitable for roses

D

Black soil – Rich in calcium carbonate

Question 88: Palette 88/91

NEET 2003 MCQ

Mycorrhiza is an example of :-

A

Ectoparasitism

B

Decomposers

C

Endoparasitism

D

Symbiotic relationship

Question 89: Palette 89/91

NEET 2002 MCQ

What is true for individuals of same species ?

A

Live in same habitat

B

Live in different habitat

C

Interbreeding

D

Live in same niche

Question 90: Palette 90/91

NEET 2002 MCQ

Two different species can not live for long duration in the same niche or habitat. This law is : -

A

Competitive exclusion principal

B

Weiseman's theory

C

Allen's law

D

Gause's hypothesis

Question 91: Palette 91/91

NEET 2002 MCQ

Which type of association is found in between entomophilous flower and pollinating agent ?

A

Coperation

B

Co-evolution

C

Mutualism

D

Commonsalism