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2.
The sequence of reproductive stages in the plant: gamete formation (ovule and pollen), pollen reaches the stigma of flower (pollination), pollen germinates and forms pollen tube that reaches to the ovary and then male gamete is released. Male gamete fuses with female gamete and forms zygote. The zygote divides several times to form an embryo. Then, there is seed development. Flowering plant's seeds have three parts, embryo formed from zygote, endosperm formed by double fertilization and seed coat formed by maternal tissue of ovule. The seeds under favorable conditions, germinate to give a seedling.
3.
Good personal hygiene is one of the best ways to protect yourself from getting illnesses such as gastroenteritis and the common cold. Washing your hands with soap removes germs that can make you ill. Maintaining good personal hygiene will also help prevent you from spreading diseases to other people.
4.
a: Tikka disease of groundnut
b: fungi, bacteria
c: fungi
d: Through insects
Friend first one i dont know but other all i answered..