Human Health and Disease — BIOLOGY STD 12 Science — Question

Sometimes cattle or even human beings give birth to their young ones that are having extremely different sets of organs like limbs/ position of eye(s) etc. Comment.

What is incubation period? How long it is for AIDS virus?

Name two types of interspecific interactions, in which one species is benefitted and the other is harmed.

Name an IUD that you would recommend to promote the cervix hostility to the sperms.

Observe the relationship between first two words and suggest suitable word for the fourth one:

1. Ovary : Mesovarium :: Uterus: A.
2. Male : Penis :: Female : B.
3. Male gametes: Sperms:: Female gametes: C.

1. Give two examples of Indian endangered species.
2. Name the region of biosphere reserve which is legally protected and where no human activity is allowed.

Thymus of a new-born child was degenerating right from birth due to a genetic disorder. Predict its two impacts on the health of the child.

Mention the causes of thinning of ozone layer.

What is studied in genetics?

The carbon atoms fixed by producers have to pass through three species. Mention the trophic level of the third species.