Short Class Notes On Angiosperms
ANGIOSPERMS
- Group of plants having covered seeds in fruits.
- Produce flowers having reproductive organs.
- Most evolved plants.
- Large no. of plants in varied habitats, small microscopic plants (Wolfia) to large trees.
- Reproduction by vegetative and sexual methods.
- In sexual reproduction pollens shed off and reach to stigma of Gynoecium by pollination.
- Pollen germinates to form pollen tube with two male gametes and one tube nucleus.
- One gamete fuses with egg (Syngamy) and other with secondary nucleus to form PEN (primary endosperm nucleus). The whole process is called Double fertilization.
- Zygote forms embryo and PEN forms Endosperm in ovule which changes into seed inside fruit.
- Ovary wall changes into Pericarp (fruit wall).
- Alternation of generation occours.
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