Human Reproduction — BIOLOGY STD 12 Science — Question

What is meant by 10% law?

Which traits of the pea plant were considered by Mendel?

State the reasons of chromosomal disorders.

Where is found maximum Biodiversity in world?

Give the categories of species mentioned in Red list.

Government of India has raised the marriageable age of female to 18 years and of males to 21 years. Suggest any two more measures adopted by Government for the purpose.

Write the equation that helps in deriving the net primary productivity of an ecosystem.
OR
How is the net primary productivity of an ecosystem derived?

Write the phenotypic ratio of Mendel's dihybrid cross?

Write the significance of adding proteases at the time of isolation of genetic materials.

Answer the following questions:
Colonisation of a rocky terrain is a natural process. Mention the group of organisms which invade this area first. Give an example.