NEET Biology: Sexual Reproduction in Flowering Plants — Practice Set 12 (10 MCQs)

NEET Biology: Sexual Reproduction in Flowering Plants — Practice Set 12

Q1. Which of the following statements about the effect of temperature on pollen viability is correct?

A. Extreme temperatures, both high and low, can reduce pollen viability.
B. Pollen viability remains unaffected by ambient temperature.
C. Only high temperatures affect pollen viability, while low temperatures enhance it.
D. Optimal pollen viability is achieved only at temperatures above 40°C.

A. Floral longevity is influenced by environmental factors and pollinator availability, affecting reproductive success.
B. Floral longevity is identical in all flowering plants regardless of environmental conditions.
C. Longer floral longevity always guarantees more pollination.
D. Floral longevity is solely genetically determined with no environmental influence.

A. The exine is the outer, resistant layer of the pollen grain that protects it from environmental stresses.
B. The exine is the inner, flexible layer that directly participates in fertilization.
C. The exine transports nutrients to the developing pollen tube.
D. The exine fuses with the ovule during fertilization.

A. Callose forms a protective barrier around the pollen tube to prevent cytoplasmic leakage.
B. Callose deposition slows down the growth of the pollen tube.
C. Callose is responsible for initiating pollen tube rupture.
D. Callose is not present in the pollen tube.

Biology — Sexual Reproduction in Flowering Plants

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Which of the following statements about the effect of temperature on pollen viability is correct?

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