Sexual reproduction in plants

Question 1

Megagometogenesis

Answer 1

• diploid nucleus goes through meiosis to produce 4 haploid megaspore
• than mitosis to produce megaspore + 3 disintegrate

mitosis again to produce: - 7 cells with 8 nuclei
- 1 egg cell
- 3 antipodal cell - for nutrients
- 2 synergid cell - direct the pollen tube growth
- 2 polar nucleus

Question 2

Microgametogenesis

Answer 2

• diploid microspore goes through meiosis to produce 2 haploid microspore
• than meiosis 2 to produce 4 haploid microspore

mitosis again to produce: - 1 pollen
- tube cell - fuses with the embryo sac
- generative cell - mitosis occurs 1 fuses with 2 polar polar nucleus - triploid endosperm than the other fuses with female egg cell which produces diploid zygote

Question 3

what is pollination ?

Answer 3

when a pollen grain lands on the stigma of a plant of the same species

Question 4

what are the two types of pollination called ?

Answer 4

• self pollination
• cross pollination

Question 5

Self pollination

Answer 5

occurs when pollen is transferred from the anther to stigma of the same plant

Question 6

Cross pollination

Answer 6

occurs when pollen is transferred from the anther of one plant to the stigma of another plant