2 Marks Questions

Question 12 Marks

Write the name of the bioactive molecules produced by the microbes listed below, and their role in the field of medical sciences.
a. Monascus purpureus
b. Trichoderma polysporum

Answer

a. Monascus purpureus: Statins
b. Trichoderma polysporum: Cyclosporin A

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Question 22 Marks

A patient who has undergone an organ transplant is put on immunosuppressant. Name the immunosuppressant and its source organism.

Answer

i. Cyclosporin A
ii. Trichoderma polysporum

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Question 32 Marks

Given below is an incomplete chart showing the influence of hormones on gametogenesis in males. Observe the chart carefully and fill in the blanks A, B, C and D

Answer

A - Testosterone
B - Spermatogenesis
C- Sertoli cells
D - Spermiogenesis

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Question 42 Marks

a. Draw a neat diagram of a mature angiospermic embryo sac and label any four cellular components.
b. Write the function of filiform apparatus.

Answer

b. Function of filiform apparatus - Guide pollen tube into synergids.

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Question 52 Marks

i. Look at the above sequence and mention the event A, B and C.
ii. What does central dogma state in molecular biology? How does it differ in some viruses?

Answer

i. A Replication of DNA
B - Transcription
C-Translation
ii. Central dogma states that the genetic information flows from DNA to RNA and then to proteins. In some viruses the flow of information is reversed in direction, i.e. from RNA to DNA.
It is called reverse transcription.

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Question 62 Marks

Lactic Acid Bacteria $ \text{(LAB)}$ sets milk into curd and also plays a very beneficial role for human health. Give any two suitable reasons.

Answer

$i.$ Improves nutritional quality by increasing Vitamin $B_{12}$
$ii.$ Beneficial role in checking disease causing microbes in stomach.

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BIOLOGY 2 Marks Questions

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