(1) Lifecycle

Question 1

How do plant and animal reproduction differ?

Answer 1

Plants:
Presence of alteration of generations in plants
Mitosis in order to create gametophyte from micro/mega spores
Animals:
2n cells result in gamete formation in animals

Question 2

Male floral organs?

Answer 2

Stamen - composed of filament and anther

Question 3

Female floral organs?

Answer 3

Pistil - stigma, style, ovary, ovules

Question 4

Explain the process of microgametogenesis?

Answer 4

To produce male gametes
- 2n microspore mother in the anther undergoes meiosis -> four haploid (n) microspores
- microspores divide asymmetrically to produce two cell structure - vegetative cell, generative cell
- only generative cell undergoes mitosis -> two sperm cells

Question 5

At the end of microgametogenesis, what are the three cells a male gametophyte can have?

Answer 5

Two sperm cells and one vegetative cell

Question 6

Explain the process of megagametogenesis

Answer 6

To produce female gametes
- 2n megastore mother cell undergoes meiosis -> four haploid (n) megaspores -> only one survives
-haploid nucleus undergoes three mitosis divisions to produce a cell with eight nuclei
- cell membrane form 7 cell megagametophyte with either nuclei
- one of seven cells becomes an egg

Question 7

Fertilization process in plants?

Answer 7

Pollen grain germinates on the stigma, pollen tube grows through the style to reach the egg in the ovule, sperm fertilizes egg to produce a zygote