Free Plant Growth And Development (Daily Quiz: 15) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

During seed germination, its stored food is mobilized by

(a) gibberellin

(b) ABA

(c) ethylene

(d) cytokinin

Question-2

Auxin regulates cell growth by which of the following mechanisms ?

(a) Altering the plasticity of cell walls

(b) Altering the elasticity of cell walls

(c) Synthesizing new cell walls

(d) Breaking down cell walls in growing cells

Question-3

The wavelength of light absorbed by $P_r$ form of phytochrome is

(a) 720 nm

(b) 680 nm

(c) 620 nm

(d) 640 nm.

Question-4

Cells of maturative phase show

(a) Protoplasmic modification

(b) Thickening of walls

(c) Both (a) and (b)

(d) None of these

Question-5

Gibberellic acid induces flowering

(a) in day-neutral plants under dark conditions

(b) in short day plants under long day conditions

(c) in some gymnospermic plants only

(d) in long day plants under short day conditions.