MCQs on Photoperiodism and Vernalization for NEET

The physiological reaction of entities or developmental responses to the length of dark or night period is known as Photoperiodism which takes place in both animals and plants. While vernalization is the induction of the flowering process in plants as a result of exposure to the prolonged winter or cold or by an artificial equivalent.

1. This influences the flowering process

(a) Photoperiod

(b) amount of green pigment

(c) acidity of the soil

(d) water in the soil

Answer: (a)

2. Pigment phytochrome is involved in

(a) Geotropism

(b) Photoperiodism

(c) Phototropism

(d) Photorespiration

Answer: (b)

3. Phytochrome is found in

(a) Fungi

(b) Algae

(c) Flowering plants

(d) Vascular cryptograms

Answer: (c)

4. The change over from vegetative to reproductive phase in many plants takes place in response to

(a) Oxygen content in the air

(b) severity of temperature

(c) length of the day

(d) mainly the food material available in the soil

Answer: (c)

5. Reversal of etiolation effect by light is called

(a) Red-far red light interaction

(b) Photomorphogenesis

(c) Anisotropic wall expansion

(d) Richmond Lang effect

Answer: (b)

6. A plant that needs not less than 10 hours of light to flower is

(a) Day neutral plant

(b) Long day plant

(c) Short day plant

(d) None of the above

Answer: (b)

7. This hormone can replace vernalization

(a) Cytokinins

(b) Gibberellins

(c) Auxin

(d) Ethylene

Answer: (b)

8. When the dark period of short day plants is interrupted by a brief exposure of light, then the plant

(a) flowers immediately

(b) will not flower at all

(c) turns into a long day plant

(d) gives more flowers

Answer: (b)

9. The pigment involved in red-far red light interconversion is

(a) Lycopen

(b) Phytochrome

(c) Cytochrome

(d) Xanthophyll

Answer: (b)

10. With which of the following process Cholodny-Went theory is concerned

(a) Photorespiration

(b) Photoperiodism

(c) Phototropism

(d) Photomorphogenesis

Answer: (c)

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