Vidaara.orgClass 7 · Mathematics
CodeVID-M7-WS
Respiration in Organisms — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
25 × 1 = 25 marks
1.
The process by which cells break down food to release energy is called:
- A.Photosynthesis
- B.Respiration
- C.Digestion
- D.Transpiration
2.
Aerobic respiration takes place in the:
- A.Absence of oxygen
- B.Presence of oxygen
- C.Absence of food
- D.Dark only
3.
Aerobic respiration breaks glucose down into carbon dioxide, energy, and:
- A.Alcohol
- B.Water
- C.Lactic acid
- D.Starch
4.
Anaerobic respiration in muscles during heavy exercise produces:
- A.Alcohol
- B.Lactic acid
- C.Oxygen
- D.Glucose
5.
Anaerobic respiration in yeast produces alcohol and:
- A.Oxygen
- B.Carbon dioxide
- C.Water
- D.Lactic acid
6.
Taking in oxygen-rich air and giving out carbon-dioxide-rich air is called:
- A.Respiration
- B.Breathing
- C.Digestion
- D.Assimilation
7.
During inhalation, the diaphragm:
- A.Relaxes and curves up
- B.Contracts and flattens
- C.Disappears
- D.Stays still
8.
One complete breath consists of one inhalation and one:
- A.Heartbeat
- B.Exhalation
- C.Pulse
- D.Digestion
9.
Compared with inhaled air, exhaled air contains more:
- A.Oxygen
- B.Carbon dioxide
- C.Nitrogen only
- D.Hydrogen
10.
The breathing rate of a person generally ______ during exercise.
- A.Decreases
- B.Increases
- C.Stays the same
- D.Becomes zero
11.
The windpipe that carries air towards the lungs is called the:
- A.Oesophagus
- B.Trachea
- C.Bronchiole
- D.Alveolus
12.
The tiny air sacs in the lungs where gases are exchanged are the:
- A.Bronchi
- B.Alveoli
- C.Nostrils
- D.Villi
13.
Air is filtered, warmed, and moistened in the:
- A.Stomach
- B.Nasal cavity
- C.Trachea
- D.Lungs
14.
The trachea divides into two tubes called:
- A.Alveoli
- B.Bronchi
- C.Bronchioles
- D.Villi
15.
At the alveoli, oxygen passes from the air into the:
- A.Stomach
- B.Blood
- C.Trachea
- D.Nose
16.
Fish breathe using organs called:
- A.Lungs
- B.Gills
- C.Tracheae
- D.Spiracles
17.
Insects take in air through tiny openings called:
- A.Alveoli
- B.Spiracles
- C.Nostrils
- D.Gills
18.
An earthworm breathes through its:
- A.Lungs
- B.Gills
- C.Moist skin
- D.Tracheae
19.
Which animal can breathe through both its skin and its lungs?
- A.Fish
- B.Frog
- C.Cockroach
- D.Earthworm
20.
The network of fine air tubes through which insects breathe is the:
- A.Alveoli
- B.Tracheae
- C.Bronchi
- D.Gills
21.
Plants respire:
- A.Only during the day
- B.Only at night
- C.All the time, day and night
- D.Never
22.
Leaves of plants exchange gases through tiny pores called:
- A.Lenticels
- B.Stomata
- C.Alveoli
- D.Spiracles
23.
The small openings in the stems of woody plants used for gas exchange are:
- A.Stomata
- B.Lenticels
- C.Gills
- D.Tracheae
24.
At night, plants take in oxygen and give out:
- A.Oxygen
- B.Carbon dioxide
- C.Nitrogen
- D.Glucose
25.
Waterlogged soil can harm plant roots because it lacks:
- A.Water
- B.Air (oxygen)
- C.Minerals
- D.Sunlight
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Respiration
- (B) Presence of oxygen
- (B) Water
- (B) Lactic acid
- (B) Carbon dioxide
- (B) Breathing
- (B) Contracts and flattens
- (B) Exhalation
- (B) Carbon dioxide
- (B) Increases
- (B) Trachea
- (B) Alveoli
- (B) Nasal cavity
- (B) Bronchi
- (B) Blood
- (B) Gills
- (B) Spiracles
- (C) Moist skin
- (B) Frog
- (B) Tracheae
- (C) All the time, day and night
- (B) Stomata
- (B) Lenticels
- (B) Carbon dioxide
- (B) Air (oxygen)
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