BIOLOGY

 

1. Bombyx mori, that produces fine filaments of silk inside the cocoon, is a:

A. Butterfly

B. Dipteran (silkworm)

C. Moth

D. Mulberry plant hemipteran

2.  How many HIV positive infections that are occurring everyday in the world?

A. 6,000

B. 60,000

C. 600,000

D. 1,000,000

3. Why was DDT banned which an organ chlorine compound, used first to control malaria, carried in mosquitoes and later to a variety to insect pests?

A. It brings about a change in sex chromosomes

B. It persists in the environment and bio-accumulates

C. It increases its affinity hundred-fold for haemoglobin preventing its coupling with oxygen

D. All of these

4. What is the reason behind the small shrunken scrotal of an adult bulls straying on Delhi roads?

A. Congenital defect

B. Negative feedback due to extremely high levels of testosterone

C. Castration

D. All of these

5. Which of the following components increases the effectiveness of the Photosynthesis process?

A. Ultraviolet

B. Red

C. Blue

D. Infrared

ANSWERS:

1.ANS.  C

2. ANS. A

3. ANS. B

4. ANS. C

5. ANS. B