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CBSE Class 7 Biology (Demo)

By Swathi T / 25/02/2025

CBSE CLASS 7 (PCMB) (Demo) CBSE Class 7 Biology (Demo)

Marking Scheme: +1 for correct answers, 0 for incorrect answers, 0 for unattempted questions. Option deselection is not available.

-Prepared by U Bala Tripura Sundari, MSc, BEd.

Time limit: 0

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Question 1 of 25

1. Question
1 point(s)
(i) respiration occurs in the presence of oxygen. In this process, the food is completely oxidized
into (ii) and water. Select the correct option for (i) and (ii).
- (i)-Aerobic; (ii)-carbon dioxide
- (i)-Anaerobic; (ii)-ethanol
- (i)-Aerobic; (ii)-ethanol
- (i)-Anaerobic; (ii)-carbon dioxide
Correct

Incorrect
Question 2 of 25

2. Question
1 point(s)
In human beings, muscle cramps occur after heavy exercise. It is because
- partial breakdown of glucose produces lactic acid
- complete breakdown of glucose produces lactic acid
- muscle cells respire in the presence of oxygen
- supply of oxygen to muscle cells increases.
Correct

Incorrect
Question 3 of 25

3. Question
1 point(s)
Breathing involves inspiration (inhalation) and expiration (exhalation) processes. During inspiration, ribs moves
- downward and outward
- upward and inward
- downward and inward
- upward and outward.
Correct

Incorrect
Question 4 of 25

4. Question
1 point(s)
Given figure illustrates the internal structure of lungs.

The exchange of gases takes place at which labelled structure?
- I
- II
- III
- IV
Correct

Incorrect
Question 5 of 25

5. Question
1 point(s)
When a person breathes in, what happens to the diaphragm and to the ribs?
- Diaphragm becomes flattened, ribs move downwards and inwards
- Diaphragm becomes flattened, ribs move outwards and upwards
- Diaphragm becomes more curved, ribs move downwards and inwards
- Diaphragm becomes more curved, ribs move outwards and upwards
Correct

Incorrect
Question 6 of 25

6. Question
1 point(s)
Accumulation of which acid causes muscular cramps?
- Acetic acid
- Formic acid
- Lactic acid
- Hydrochloric acid
Correct

Incorrect
Question 7 of 25

7. Question
1 point(s)
Which of the following statements is correct?
- Inhaled air contains more oxygen than that of exhaled air.
- Exhaled air contains more oxygen than that of inhaled air.
- Inhaled air contains equal amount of carbon dioxide and oxygen.
- Exhaled air contains equal amount of carbon dioxide and oxygen.
Correct

Incorrect
Question 8 of 25

8. Question
1 point(s)
Match column I with column II and select the correct option.
- A – (iii), B – (ii), C – (iv), D – (i)
- $$\mathrm{A}-$$ (ii), B – (iii), C – (iv), D – (i)
- A – (iii), B – (i), C – (ii), D – (iv)
- A – (ii), B – (iv), C – (i), D – (iii)
Correct

Incorrect
Question 9 of 25

9. Question
1 point(s)
Fitness training increases the concentration of lactic acid that athletes can tolerate in their muscles. What is a consequence of this increase?
- Aerobic respiration in muscles can be more rapid
- Blood flow to the muscles is increased
- More anaerobic respiration can take place in muscles
- None of these
Correct

Incorrect
Question 10 of 25

10. Question
1 point(s)
Which of the following options contains correct equation for aerobic respiration?
- $$\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}+\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+$$ Energy
- $$\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2} \rightarrow 6 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O}+$$ Energy
- $$\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2}+$$ Energy
- $$\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2} \rightarrow \mathrm{H}_{2} \mathrm{O}+6 \mathrm{O}_{2}+$$ Energy
Correct

Incorrect
Question 11 of 25

11. Question
1 point(s)
Select the correct statement out of the following.
- One breath consists of one inhalation and one exhalation.
- Breathing rate increases during sleeping.
- Breathing rate decreases during fever.
- Number of heart beats per minute is called as breathing rate.
Correct

Incorrect
Question 12 of 25

12. Question
1 point(s)
Breathing rate per minute in humans during heavy exercise can become
- 20-25 times
- 16-18 times
- 10-12 times
- 5-10 times.
Correct

Incorrect
Question 13 of 25

13. Question
1 point(s)
Select the correct statement out of the following.
- Guard cells help in opening and closing of stomata.
- Stomata present on leaf surface help in
- Loss of exchange. occurs through stom transpiration in plants
- All of these
Correct

Incorrect
Question 14 of 25

14. Question
1 point(s)
Given figure represents
- tracheal respiration in insects
- cutaneous respiration in cockroach
- lung respiration in grasshopper
- brachial respiration in insects.
Correct

Incorrect
Question 15 of 25

15. Question
1 point(s)
What are the products of aerobic respiration?
- $$\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+\mathrm{CO}_{2}$$
- $$\mathrm{CO}_{2}+\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$$
- $$\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}$$
- $$\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}$$
Correct

Incorrect
Question 16 of 25

16. Question
1 point(s)
What are the products of anaerobic respiration in yeast?
- Alcohol only
- Lactic acid only
- Both alcohol and carbon dioxide
- Both alcohol and lactic acid
Correct

Incorrect
Question 17 of 25

17. Question
1 point(s)
Breathing is a __________ process and respiration is a ___________ process.
- mechanical, mechanical
- physical, bio-chemical
- bio-chemical, physical
- chemical, chemical
Correct

Incorrect
Question 18 of 25

18. Question
1 point(s)
Which of the following organs serves as the common passage for both food and air?
- Pharynx
- Larynx
- Oesophagus
- Trachea
Correct

Incorrect
Question 19 of 25

19. Question
1 point(s)
During respiration, plants
- release $$\mathrm{O}_{2}$$ and take in $$\mathrm{CO}_{2}$$
- release $$\mathrm{H}_{2} \mathrm{O}$$ and take in $$\mathrm{O}_{2}$$
- release $$\mathrm{CO}_{2}$$ and take in $$\mathrm{O}_{2}$$
- both (b) and (c).
Correct

Incorrect
Question 20 of 25

20. Question
1 point(s)
Which of these is not true about cellular respiration?
- It releases energy.
- It occurs only during the day.
- It utilizes oxygen and liberates carbon dioxide.
- It occurs in most plants and animals.
Correct

Incorrect
Question 21 of 25

21. Question
1 point(s)
The diagram shows some animals and green plants sealed in an aquarium.

What is needed to keep the organisms alive for the longest possible time?
- Carbon dioxide
- Sunlight
- Nitrates
- Oxygen
Correct

Incorrect
Question 22 of 25

22. Question
1 point(s)
Which of the following organs are parts of the human respiratory system?

I. Pharynx

II. Nostrils

III. Gullet

IV. Windpipe

V. Lungs
- II and V only
- II, IV and V only
- I, II, IV and V only
- All of these
Correct

Incorrect
Question 23 of 25

23. Question
1 point(s)
The given figure illustrates the effect of exhaled air on lime water.
- carbon monoxide
- carbon dioxide
- nitrogen
- oxygen
Correct

Incorrect
Question 24 of 25

24. Question
1 point(s)
Select the incorrect statement regarding given structures.
- These are stomata present on leaf surfaces.
- These structures help in gaseous exchange in plants.
- These open and close in response to presence and absence of water.
- These are present in roots also.
Correct

Incorrect
Question 25 of 25

25. Question
1 point(s)
Select the incorrect statement out of the following.
- A tadpole respires through gills.
- Birds and mammals possess lungs for gaseous exchange.
- Gills in fish are richly supplied with blood vessels.
- Amoeba and Paramecium possess spiracles for gaseous exchange.
Correct

Incorrect

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