Which cell does a HIV virus initially invade? Give the other cell where HIV replication takes place? How many days can it survive? List the routes of transmission.

In which phase of cell cycle, does replication of DNA take place?

HIV survives ……… days inside a cell

Answer the following questions in concern with TCA cycle. (a) Where does it takes place ? (b) When and by whom it was discovered ? (c ) Name the first formed product of the cycle. (d) How many ATP molecules are generated per cycle ? (e ) TCA cycle is a amphibolic pathway. Say yes or no. Why ?

With regards to toxicity and the need for dilution in water, how different are ureotelic and uricotelic excretions? Give examples of animals that use these types of excretion. Ureotelism: 1. The process of excreting urea is called ureotelism. 2.Animals which are found in places where water availability is not abundant have this mode of excretion. 3. They convert Ammonia produced in the body into urea in the liver and release it to the blood. This is filtered and excreted by the kidneys, Eg: Mammals, many terrestrial amphibians and marine fishes. 4.In terms of toxicity urea is more toxic than uric acid but it is soluble in water and is thus excreted as urine.

(i) A person went to a restaurant for dinner. In the menu card, the person saw 10 Indian and 7 Chinese food items. In how many was the person can select either an Indian or a Chinese food? (ii) There are 3 typesof toy car and 2 types of toy train available in a shop. Find the number of ways a baby can buy a toy car and a toy train? (iii) How many of two-digit numbers can be formed using 1,2,3,4,5 without repetiton of digits? (iv) There persons enter in to a conference hall in which there are 10 seats, In how many ways they can take their place? (v) In how many ways 5 persons can be seated in a row?

The list given below includes various stages of HIV infection. Arrange them according to correct sequence Viral replication - Macrophage - Helper T cell - Formation of DNA - Progeny virus - Viral particle - Release of progeny virus.

Meiosis cell division does not take place during the gametes formation of drone bee. Give reason.

Given below is the sketch of a plant for carrying out a process. (i) Name the process occuring in the above plant. (ii) To which containeer does the net flow of solvent take place ? (iii) Name one SPM which can be used in this plant. (iv) Give one practical use of the plant.