Biology MCQs

Question 1

Complete oxidation of sucrose in presence of oxygen into CO2, water and energy is called

Accepted Answer

Aerobic respiration

Answer

Anaerobic respiration

Answer

Glycolysis

Answer

Hydrolysis

Question 2

When the diaphragm and external intercostal muscles contract,

Accepted Answer

The volume of the thorax increases

Answer

The volume of the thorax decreases

Answer

The volume of the lungs decreases

Answer

The lungs shrink

Question 3

Blood leaving lungs, is rich in

Accepted Answer

Oxygen

Answer

Carbondioxide

Answer

Haemoglobin

Answer

Number of RBC

Question 4

The organs protected by the thoracic cage include the

Accepted Answer

Both a & b

Answer

Lungs

Answer

Heart

Answer

None of the above

Question 5

By complete oxidation of glucose number of ATP molecule formed is

Accepted Answer

38

Answer

2

Answer

28

Answer

48

Question 6

If CO2 concentration in the blood increases, the breathing will

Accepted Answer

Increase

Answer

Decrease

Answer

Stop

Answer

No effect

Question 7

Which of the following is the cellular respiratory centre?

Accepted Answer

Mitochondria

Answer

Nucleus

Answer

Ribosome

Answer

Golgi body

Question 8

The first root produced from a seed is known as

Accepted Answer

Radicle

Answer

Conical root

Answer

Fusiform root

Answer

None of the above

Question 9

The site in ovule where funicle is attached

Accepted Answer

Hilum

Answer

Nucellus

Answer

Chalaza

Answer

Raphe