Even after killing the generative cell with a laser beam, the pollen grain of a flowering plant germinates and produces normal pollen tube because

Options

A. Laser beam stimulates pollen germination and pollen tube growth
B. The laser beam does not damage the region from which pollen tube emerges
C. The contents of killed generative cell permit germination and pollen tube growth
D. The vegetative cell has not been damaged

Answer

D

Explanation

Even after killing the germinative cell with a laser beam the pollen grain of a flowering plant germinates because the vegetative cell has not been damaged. Vegetative nuclei enter into pollen tube and assume terminal position. It also has sporopollenin which protects it from high temperature certain enzymes.