Biology 2nd Paper MCQ-Cumilla Board-2017

1. What is the name of the response of an animal due to the difference in $\mathrm{O}_{2}$ density?

2. Which animal is bilaterally symmetrical?

3. If the $\mathrm{CO}_{2}$ level increases in the blood-

i. chemoreceptors are stimulated

ii. respiratory rate decreases.

iii. the enzymes and proteins of the body are destroyed.

Which one is correct?

4. Which hormone helps in the formation of the fetal lung during embryogenesis?

5. What will be the ratio of the second generation according to the stem?