Show the alternation of generation in fern with the help of a word diagram.
OR
Show the process of sexual reproduction in flowering plants with the help of a word diagram.
WBBSE
Class X
Life Science
02 (b) Reproduction
02 (c) Sexual Reproduction In Flowering Plants
5
2022
Alternation of Generation in Fern (Word Diagram):
Sporophyte (2n) → Sporangium → Spore (n) → Germination → Gametophyte (n) → Antheridium & Archegonium → Sperm & Egg (fusion) → Zygote (2n) → Young Sporophyte → Adult Sporophyte (2n)
- Sporophyte produces spores by meiosis.
- Spores germinate to form the gametophyte.
- Gametophyte produces gametes (sperm and egg).
- Fusion of gametes forms a zygote.
- Zygote grows into a new sporophyte.
Or
Process:
Anther (microspores, pollen grains) → Pollination → Stigma → Germination of pollen grain → Pollen tube → Style → Ovary → Ovule → Embryo sac (female gametophyte) → Sperm cells travel down pollen tube → Fertilization (fusion of sperm and egg) → Zygote (2n) → Embryo → Seed → Germination → New Plant
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