STD 12 - 8. microbes in human welfare — Biology STD 12 Science — Question

Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?

A universal phenomenon in sexually reproducing organisms is the formation of:

Genetically active area of chromosome is called

The branch of biology which deals with the improvement of plant variety is:

If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be:

Assertion : Species are groups of potentially interbreeding natural populations which are isolated from other such groups.

Reason : Distinctive morphological characters are displayed due to reproductive isolation.

In malignant tumors, the cells proliferate, grow rapidly and move to other parts of the body to form new tumors. This stage of disease is called:

Degeneracy of genetic code was discovered by:

Pollen grain is liberated at: