Human Reproduction — BIOLOGY STD 12 Science — Question

Give information about Cannabinoids.

On which observation, the law of segregation is based?

Do eukaryotic cells have restriction endonucleases? Justify your answer.

Given below is the relationship between the HIV levels in the blood and helper T cell count in a person detected with AIDS. Study the relationship and answer the questions that follow.

A. What kind of relationship is observed in the virus levels and the immune response after some days of the initial infection?
B. Does it completely clear the virus from the body permanently? Give reason for your answer.

Name the bacterium responsible for the large holes seen in “Swiss Cheese”. What are these holes due to?

Which species of Penicillium produces roquefort cheese?

During the secondary treatment of the primary effluent how does the significant decrease in BOD occur?

OR

During the secondary treatment of the primary effluent how does the significant decrease in BOD occur?

The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:
i. Bacteria
ii. Banyan
iii. Deer
iv. Fish

Fill in the blank (i), (ii), (iii), (iv) with name of the mammals of Australia.

S. No	Placental mammal	Marsupial mammal
(i)	Anteater	(i)
(ii)	(ii)	Spotted cuscus
(iii)	Bob cat	(iii)
(iv)	(iv)	Tasmanian wolf