Question 1: Palette 1/48

NEET 2023 MCQ

Which of the following mineral ion is not remobilized in plants?

A

Potassium

B

Calcium

C

Nitrogen

D

Phosphorus

Question 2: Palette 2/48

NEET 2023 MCQ

Match Column I with Column II.

	Column - I		Column - II
(A)	Nitrococcus	(I)	Denitrification
(B)	Rhizobium	(II)	Conversion of ammonia to nitrite
(C)	Thiobacillus	(III)	Conversion of nitrite to nitrate
(D)	Nitrobacter	(IV)	Conversion of atmospheric nitrogen to ammonia

A

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

B

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

C

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

D

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

Question 3: Palette 3/48

NEET 2023 MCQ

Which micronutrient is required for splitting of water molecule during photosynthesis?

A

Molybdenum

B

Magnesium

C

Copper

D

Manganese

Question 4: Palette 4/48

NEET 2023 MCQ

Match List I with List II:

	List I		List II
(A)	Iron	(I)	Synthesis of auxin
(B)	Zinc	(II)	Component of nitrate reductase
(C)	Boron	(III)	Activator of catalase
(D)	Molybdenum	(IV)	Cell elongation and differentiation

Choose the correct answer from the options given below:

A

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

B

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

C

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

D

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

Question 5: Palette 5/48

NEET 2022 MCQ

Which of the following protects nitrogenase inside the root nodule of a leguminous plant?

A

Glutamate dehydrogenase

B

Catalase

C

leg haemoglobin

D

Transaminase

Question 6: Palette 6/48

NEET 2022 MCQ

Match List-I with List-II

	List - I		List - II
(a)	Manganese	(i)	Activates the enzyme catalase
(b)	Magnesium	(ii)	Required for pollen germination
(c)	Boron	(iii)	Activates enzymes of respiration
(d)	Iron	(iv)	Functions in splitting of water during photosynthesis

Choose the correct answer from the options given below:

A

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

B

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

C

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

D

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

Question 7: Palette 7/48

NEET 2022 MCQ

Which one of the following produces nitrogen fixing nodules on the roots of Alnus?

A

Rhizobium

B

Frankia

C

Rhodospirillum

D

Beijerinckia

Question 8: Palette 8/48

NEET 2021 MCQ

Match Column - I with Column - II.

	Column-I		Column-II
(a)	Nitrococcus	(i)	Denitrification
(b)	Rhizobium	(ii)	Conversion of ammonia to nitrite
(c)	Thiobacillus	(iii)	Conversion of nitrite to nitrate
(d)	Nitrobacter	(iv)	Conversion of atmospheric nitrogen to ammonia

Choose the correct answer from options given below.

A

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

B

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

C

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

D

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

Question 9: Palette 9/48

NEET 2020 MCQ

Match the following concerning essential elements and their functions in plants

(a) Iron               (i) Photolysis of water
(b) Zinc              (ii) Pollen germination
(c) Boron            (iii) Required for chlorophyll biosynthesis
(d) Manganese    (iv) IAA biosynthesis

Select the correct option

A

(A) $ \to $ (iv), (B) $ \to $ (iii), (C) $ \to $ (ii), (D) $ \to $ (i)

B

(A) $ \to $ (iv), (B) $ \to $ (i), (C) $ \to $ (ii), (D) $ \to $ (iii)

C

(A) $ \to $ (iii), (B) $ \to $ (iv), (C) $ \to $ (ii), (D) $ \to $ (i)

D

(A) $ \to $ (ii), (B) $ \to $ (i), (C) $ \to $ (iv), (D) $ \to $ (iii)

Question 10: Palette 10/48

NEET 2020 MCQ

The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are

A

Ammonia alone

B

Nitrate alone

C

Ammonia and oxygen

D

Ammonia and hydrogen

Question 11: Palette 11/48

NEET 2018 MCQ

Which of the following elements is responsible for maintaining turgor in cells?

A

Sodium

B

Calcium

C

Magnesium

D

Potassium

Question 12: Palette 12/48

NEET 2018 MCQ

In which of the following forms is iron absorbed by plants?

A

Ferrous

B

Both ferric and ferrous

C

Ferric

D

Free element

Question 13: Palette 13/48

NEET 2016 MCQ

Which is essential for the growth of root tip?

A

Zn

B

Fe

C

Ca

D

Mn

Question 14: Palette 14/48

NEET 2016 MCQ

In which of the following all three are macronutrients?

A

Molybdenum, magnesium, manganese

B

Nitrogen, phosphorus, sulphur

C

Boron, Zinc, manganese

D

Iron, copper, molybdenum

Question 15: Palette 15/48

NEET 2015 MCQ

The oxygen evolved during photosynthesis, comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

A

Magnesium and Molybdenum

B

Magnesium and Chlorine

C

Manganese and chlorine

D

Manganese and Potassium

Question 16: Palette 16/48

NEET 2015 MCQ

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

A

carotene

B

cytochrome

C

leghaemoglobin

D

xanthophyll.

Question 17: Palette 17/48

NEET 2015 MCQ

Minerals known to be required in large amounts for plant growth include

A

potassium, phosphorus, selenium, boron

B

magnesium, sulphur, iron, zinc

C

phosphorus, potassium, sulphur, calcium

D

calcium, magnesium, manganese, copper.

Question 18: Palette 18/48

NEET 2014 MCQ

Deficiency symptoms of nitrogen and potassium are visible first in

A

senescent leaves

B

young leaves

C

roots

D

buds.

Question 19: Palette 19/48

NEET 2013 MCQ

Specialized cells for fixing atmospheric nitrogen in Nostoc are

A

heterocysts

B

hormogonia

C

modules

D

akinetes.

Question 20: Palette 20/48

NEET 2013 MCQ

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N₂) to the atmosphere?

A

Aerobic nitrate oxidation and nitrate reduction

B

Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds

C

Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes

D

Anaerobic ammonium oxidation and denitrification

Question 21: Palette 21/48

NEET 2013 MCQ

Which of the following elements is a constituent of biotin?

A

Magnesium

B

Calcium

C

Phosphorus

D

Sulphur

Question 22: Palette 22/48

NEET 2013 MCQ

The first stable product of fixaation of atmospheric nitrogen in leguminous plants is

A

NO$_3^ - $

B

glutamate

C

NO$_2^ - $

D

ammonia.

Question 23: Palette 23/48

NEET 2012 MCQ

For its action, nitrogenase requires

A

high input of energy

B

light

C

Mn²⁺

D

super oxygen radicals.

Question 24: Palette 24/48

NEET 2012 MCQ

Which one of the following is correctly matched?

A

Passive transport of nutrients $-$ ATP

B

Apoplast $-$ Plasmodesmata

C

Potassium $-$ Readily immobilisation

D

Bakane of rice seedlings $-$ F. Skoog.

Question 25: Palette 25/48

NEET 2012 MCQ

Best defined function of manganese in green plants is

A

photolysis of water

B

Calvin cycle

C

nitrogen fixation

D

water absorption.

Question 26: Palette 26/48

NEET 2011 MCQ

Which one of the following is not an essential mineral element for plants while the remaining three are?

A

Iron

B

Manganese

C

Cadmium

D

Phosphorus

Question 27: Palette 27/48

NEET 2011 MCQ

Which one of the following elements in plants is not remobilised?

A

Phosphorus

B

Calcium

C

Potassium

D

Sulphur

Question 28: Palette 28/48

NEET 2011 MCQ

Which one of the following helps in absorption of phosphorus from soil by plants?

A

Glomus

B

Rhizobium

C

Frankia

D

Anabaena

Question 29: Palette 29/48

NEET 2011 MCQ

Nitrifying bacteria

A

oxidize ammonia to nitrates

B

convert free nitrogen to nitrogen compounds

C

convert proteins into ammonia

D

reduce nitrates to free nitrogen.

Question 30: Palette 30/48

NEET 2011 MCQ

The function of leghaemoglobin in the root nodules of legumes is

A

inhibition of nitrogenase activity

B

oxygen differentiation

C

nodule differentiation

D

expression of nif gene.

Question 31: Palette 31/48

NEET 2010 MCQ

Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D.

A

A		B		C		D
Nitrification		Ammoni fication		Animals		Plants

B

A		B		C		D
Denitrification		Ammoni fication		Plants		Animals

C

A		B		C		D
Nitrification		Denitrification		Animals		Plants

D

A		B		C		D
Denitrification		Nitrification		Plants		Animals

Question 32: Palette 32/48

NEET 2010 MCQ

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen through the process of symbiotic nitrogen fixation. which one of the following statements is not correct during this process of nitrogen fixation?

A

Leghaemoglobin scavenges oxygen and is pinkish in colour.

B

Nodules act as sites for nitrogen fixation.

C

The enzyme nitrogenase catalyses the conversion of atmospheric N₂ to NH₃

D

Nitrogenase is insensitive to oxygen.

Question 33: Palette 33/48

NEET 2010 MCQ

Which one of the following is not a micronutrient?

A

Molybdenum

B

Magnesium

C

Zinc

D

Boron

Question 34: Palette 34/48

NEET 2010 MCQ

An element playing important role in nitrogen fixation is

A

molybdenum

B

copper

C

manganese

D

zinc.

Question 35: Palette 35/48

NEET 2009 MCQ

Manganese is required in

A

plant cell wall formation

B

photolysis of water during photosynthesis

C

chlorophyll synthesis

D

nucleic acid synthesis.

Question 36: Palette 36/48

NEET 2007 MCQ

A plant requires magnesium for

A

protein synthesis

B

chlorophyll synthesis

C

cell wall development

D

holding cells together.

Question 37: Palette 37/48

NEET 2007 MCQ

Which one of the following elements is not an essential micronutrient for plant growth?

A

Zn

B

Cu

C

Ca

D

Mn

Question 38: Palette 38/48

NEET 2006 MCQ

Sulphur is an important nutrient for optimum growth and productivity in

A

oilseed crops

B

pulse crops

C

cereals

D

fibre crops.

Question 39: Palette 39/48

NEET 2005 MCQ

The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport?

A

Co, Ni, Mo

B

Ca, K, Na

C

Mn, Co, Ca

D

Cu, Mn, Fe

Question 40: Palette 40/48

NEET 2004 MCQ

If by radiation all nitrogenase enzyme are inactivated, then there will be no

A

fixation of nitrogen in legumes

B

fixation of atmospheric nitrogen

C

conversion from nitrate to nitrite in legumes

D

conversion from ammonium to nitrate in soil.

Question 41: Palette 41/48

NEET 2003 MCQ

Gray spots of oat are caused by deficiency of

A

Cu

B

Zn

C

Mn

D

Fe

Question 42: Palette 42/48

NEET 2003 MCQ

Boron in green plants assists in

A

activation of enzymes

B

acting as enzyme co-factor

C

photossynthesis

D

sugar transport.

Question 43: Palette 43/48

NEET 2002 MCQ

Choose the correct match.
Bladderwort, sundew, Venus flytrap

A

Nepenthes, Dionea, Drosera

B

Nepenthes, Utricularia, Vanda

C

Uricularia, Drosera, Dionea

D

Dionea, Trapa, Vanda.

Question 44: Palette 44/48

NEET 2001 MCQ

Roots of which plant contains a red pigment which have affinity for oxygen?

A

Carrot

B

Soybean

C

Mustard

D

Radish

Question 45: Palette 45/48

NEET 2001 MCQ

Which aquatic fern performs nitrogen fixation?

A

Azolla

B

Nostoc

C

Salvia

D

Salvinia

Question 46: Palette 46/48

NEET 2000 MCQ

When the plants are grown in magnesium deficient but urea rich soil, the symptoms expressed are

A

yellowish leaves

B

colourless petiole

C

dark green leaves

D

shoot apex die.

Question 47: Palette 47/48

NEET 2000 MCQ

Plants take zinc in the form of

A

ZnSO₄

B

Zn⁺⁺

C

ZnO

D

Zn.

Question 48: Palette 48/48

NEET 2000 MCQ

Mg is a component of

A

chlorophyll

B

cytochrome

C

haemoglobin

D

haemocyanin