Organisms and Populations — BIOLOGY STD 12 Science — Question

Mention any two reasons why the primary productivity varies in different types of ecosystems?

What type of charged molecules are DNA segments?

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?

Give an example of a human disorder that is caused due to a single gene mutation.

Name the dominant producers in a deep aquatic ecosystem. What other name could you give to a primary consumer?

Name any two extinct forms of life.

Somatic chromosome number is 40. What shall be the chromosome number in the cells of seminiferous tubules?

Write one benefit of using condom.

If the testis fail to descend in scrotal sac, which activity of adult for reproduction will be affected? Give reason.

How do the tRNA molecules appear in
(i) two-dimensional, and (ii) three-dimensional views?