(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Give reason for the following:

The walls of the left ventricle are thicker than the walls of all other chambers.

Give reason for the following:

Blood flowing away from the stomach and intestines is put into circulation via the liver and
not directly.

Give reason for the following:

The blood groups of both the donor and recipient must be known before transfusing blood.

Give reason for the following:

Only the veins and not the arteries are provided with valves.

Give reason for the following:

Atrial wall is less muscular than the ventricular wall.

Give reason for the following:

The arteries are deep seated in the body

Mention whether the following statement is (T) Or (F). Give reason in support of your answer. 

Nuclear membrane in mitotically dividing cells remains intact up to the metaphase and disappears only in the telophase. 

Given below is a highly schematic diagram of the human blood circulatory system.

1. Which part (state the number) represents the heart? Give reason in support of your answer.
2. Which numbers represent the following, respectively?
   

   Aorta	Superior vena cava
   Hepatic portal vein	Renal Vein
   Pulmonary artery	Stomach

Given diagram shows a simple diagram of the circulation of blood in a mamma showing the
main blood vessels, the heart, lungs and body tissues. The blood vessel, labelled 6, contains
deoxygenated blood and the valve leading to it has three semi-lunar pockets.

(a) Name the blood vessels and organs marked by numbers 1 to 8.
(b) What is meant by the term ‘double circulation’ of blood in mammals?
(c) what is diastole?
[There is an “error” in the diagram. According to the usual practice the pulmonary (lung)
circulation is shown upward and the systemic downward, but here it is reversed].

Differentiate between following pair with reference to the aspect in bracket.

cerebrum and spinal cord (arrangement of cytons and exons of neurons).

 Match the items given in Column A with the most appropriate ones in Column B and REWRITE the correct matching pairs : 
Column A                     Column B 

(i) Cranial nerves            Testosterone
(ii) Leydig cells                Natural reflex 
(iii) Acetylcholine            12 pairs 
(iv) Spinal nerves             Prolactin
(v) Sneezing                     Neurotransmitter
                                         - 18 pairs

                                         - 31 pairs
                                         - Conditioned reflex                         

Define the following:

Cytokinesis

Choose the correct answer:

Cytokinesis involves

Choose the correct answer:
If after karyokinesis, cytokinesis does not occur, then result would be ___________

Choose the correct answer:
Nuclear membrane reappears in _________________

Explain the following:
Why is the closed circulatory system more efficient than the open system?