NEET (Phase-II) 2016
Q1
Errorless
Angiosperm
Numerical
In majority of angiosperms
(a) A small central cell is present in the embryo sac (b) Egg has a filiform apparatus (c) There are numerous antipodal cells 111
Correct Answer: D
Explanation:
Megaspore Mother Cell (MMC) undergoes meiosis to form megaspore.
Odisha JEE 2002
Q2
Errorless
Spirogyra and Ulothrix
Numerical
In Spirogyra
(a) The filaments showing scalariform conjugation are homothallic (b) The filaments showing lateral conjugation are homothallic (c) The filaments showing lateral conjugation are heterothallic
Correct Answer: B
Explanation:
The filament showing lateral conjugation are homothallic because both male and female gametes are found in same filament.
AFMC 1995
Q3
Errorless
Selaginella
Numerical
Number of megaspore in Selaginella rupestris is
(a) One (b) Two (c)Six (d) Seven
(a) One (b) Two (c)Six (d) Seven
Correct Answer: A
Explanation:
The four megaspores derived from a megaspore mother cell may not always be functional. e.g., In. S. rupestris single megaspore is functional. In male gametophyte the first division leads to formation of a small prothallial cell and a large antheridial cell.