Page 95 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

v Phloem connects leaves to all the parts of the plant including roots. It helps in the
transportation of the food prepared by the leaves to all the parts of the plant by a process

called translocation.
v Transpiration is a process by which plants lose excess water in the form of water vapours

through the stomata present on the surface of the leaves.
v The discovery of blood circulation was done by William Harvey in the 17th century.

v Stephen Hales, an English clergyman & amateur physiologist demonstrated that water from
the soil moves up the stems to the leaves where it is lost as water vapour by a process called

transpiration.
Exercise

A. Tick (3) the correct answer.
1. The normal pulse rate in adult human beings is ................... .

(a) 70 to 90 per minute (b) 70 to 80 per minute

(c) 40 to 70 per minute (d) 70 to 100 per minute
Ans. (b)

2. Which among the following contains haemoglobin? zz
(a) Red blood cells (b) White blood cells

(c) Both (a) and (b) (d) none of these

Ans. (a)
3. The organ which controls blood circulation is the ................... .

(a) Liver (b) Lungs
(c) Heart (d) Kidney

Ans. (c)

4. The lower chambers of the heart are called ................... .
(a) Atria (b) Ventricles

(c) Aorta (d) Vena cava

Ans. (b)
5. The filtration of blood is done by ................... .

(a) Heart (b) Kidney

(c) Blood (d) Urethra
Ans. (b)

B. Fill in the blanks.
1. Platelets play a major role in blood ................... .

Ans. clotting

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