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SAI International School

Std -X, Subject- BIOLOGY
Chapter- Life Processes
Sub Topic- Transportation in Human Beings- (II)
Module- 9
Home Assignment- II
Worksheet-3

Q1.
The diagram represents a part of human circulatorysystem. Where is the blood pressure
highest?

Q2. Lack of oxygen in muscles often leads to cramps among cricketers. This results due to
(a) Conversion of pyruvate to ethanol
(b) Conversion of pyruvate to glucose
(c) Non conversion of glucose to pyruvate
(d) Conversion of pyruvate to lactic acid

Q3. Instrument used to measure blood pressure is
(a) barometer (b) potometer
(c) thermometer (d) sphygmomanometer

DIRECTION : Question nos. 4 and 5 consist of two statements –
Assertion (A) and Reason (R). Answer these questions selecting the appropriate option
given below:
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
e) Both Assertion and Reason are false.

Q4. Assertion : In human heart, there is no mixing of oxygenated and deoxygenated
blood.
Reason : Valves are present in the heart which allows the movement of blood in one
direction only.

Q5. Assertion : Alveoli contain an extensive network of blood vessels.
Reason : Alveoli is the site where exchange of gases occurs.

Q6. a) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and