Page 86 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

Exercise

A. Tick (3) the correct answer.

1. Anaerobic respiration takes place in our skeletal muscles and produce .................. .
(a) Lactic acid (b) Ethyl alcohol (c) Glucose (d) None of these

Ans. (a)

2. In which pair of cell structures does cellular respiration take place?
(a) Cytoplasm, endoplasmic reticulum

(b) Mitochondria, chloroplast
(c) Cytoplasm, mitochondria

(d) Endoplasmic reticulum, mitochondria

Ans. (c)
3. Which of the following forms of carbohydrates is broken down during respiration?

(a) Fructose (b) Sucrose (c) Glucose (d) Lactose

Ans. (c)
4. During exhalation, the ribs .................. .

(a) Move down and inwards (b) Move upwards

(c) Move outwards (d) Do not move at all
Ans. (a)

5. Yeast is used in wine and beer industries because it respires .................. .
(a) Aerobically, producing oxygen

(b) Aerobically, producing alcohol

(c) Anaerobically, producing alcohol
(d) Anaerobically, producing carbon dioxide

Ans. (c)
B. Fill in the blanks.

1. .................. and .................. are the two by-products of aerobic respiration.

Ans. Carbon dioxide, water
2. The accumulation of .................. causes muscle cramps during exercise (due to

anaerobic respiration).

Ans. lactic acid
3. Woody stems have tiny openings called ............... .

Ans. lenticels

4. Fishes respire through ............... .
Ans. gills

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