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Q:

Which one of the following statements regarding haemoglobin is correct?

A) Haemoglobin present in RBC can carry only oxygen but not carbon dioxide B) Haemoglobin of RBC can carry both oxygen and carbon dioxide
C) Haemoglobin of RBC can carry only carbon dioxide D) Haemoglobin is only used for blood clotting and not for carrying gases.
 
Answer & Explanation Answer: B) Haemoglobin of RBC can carry both oxygen and carbon dioxide

Explanation:

During respiration, about 97% of oxygen is transported by Red Blood Cells in blood and the remaining 3% gets dissolved in the plasma.Around 20-25% of carbon dioxide is carried by haemoglobin as carbamino-haemoglobin.

Oxygen enters the blood from the lungs and carbon dioxide is expelled out of the blood into the lungs. The blood serves to transport both gases. Oxygen is carried to the cells. Carbon dioxide is carried away from the cells.

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Q:

What produces the striations of a skeletal muscle cell?

Answer

The striations are a result of the A bands of sarcomeres appearing as relatively wide, dark stripes under the microscope, which alternate with narrower, lighter colored stripes formed by the I bands. 


The striations of skeletal muscle are created by the organization of actin and myosin filaments resulting in the banding pattern of myofibrils.

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Q:

Fishes have a ........ chambered heart.

A) Single B) Three
C) Four D) Two
 
Answer & Explanation Answer: D) Two

Explanation:
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Q:

In each testes in a male reproductive system, there are ________ compartments called testicular lobules.

A) 150 B) 200
C) 250 D) 300
 
Answer & Explanation Answer: C) 250

Explanation:
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Q:

The cell walls of many organisms of Fungi kingdom are made of a tough complex sugar called ______.

A) Pectin B) Suberin
C) Cellulose D) Chitin
 
Answer & Explanation Answer: D) Chitin

Explanation:
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Q:

Which of the following organisms does not fit into the Cell Theory?

A) Bacteria B) Virus
C) Fungi D) Plants
 
Answer & Explanation Answer: B) Virus

Explanation:
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Q:

Who discovered Nitrogen?

A) Faraday B) Heisenberg
C) Hooke D) Rutherford
 
Answer & Explanation Answer: D) Rutherford

Explanation:
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Q:

In mammals, an important role of excretion is played by________

A) Large intestine B) Kidneys
C) Lungs D) Liver
 
Answer & Explanation Answer: B) Kidneys

Explanation:
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