Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Give three reasons as to why prokaryotes are not given any figures for their diversity.

Name any four drugs that are used as medicines to help patients cope with mental illness.

State the stage at which oogonia reach their maximum number.

Which layer of uterus undergoes cyclic changes during the menstrual cycle?

A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters.

1. Work out the cross with the help of a Punnet square.
2. Name the type of the cross carried out.

Name the phenomenon that leads to situations like ‘XO’ abnormality in humans. How do humans with ‘XO’ abnormality suffer? Explain.

Name the type of immunity a baby is born with. How is it different from the one he gets from the mother’s milk after birth?

'Resource partitioning' is one of the mechanisms by which competitors can co exist. Explain with example.