Question

1)In flowers what parts produce pollen? How many soerms does each pollen grain contain?

2) In flowers what part acceots the sperm? How does the sperm reach the egg?

3) what is the purpose of double fertilization in angiosperm?

4) What part of the flower developes into fruit? What is the purpose of fruit

5) which are the vwctors that can perform in angiosperm

6) Which types of meristematic tissue can we identify in plants(speify if they are primary or secondary)

Answer 1

1) anther in the flower produces the pollen, each pollen contains 2 sperms, the male gamete divides to a vegetative cell and generative cell. the vegetative cell in the pollen produces the pollen tube the generative cell divides to produce 2 sperms so pollen contains 2 sperms.

2) pollen grains reach the stigma of the flower, that is stigma accepts the pollen, sperm reach the egg by forming pollen tube, a pollen tube grows through style to reach stigma.

3) double fertilization produces a zygote and a triploid endosperm, one sperm fertilizes the egg to produce a zygote and another sperm fertilizes the central cell to form endosperm, which is triploid, it nourishes the growing embryo.

4) The ovary develops into the fruit. fruit protects the developing seed.