SCIENCE CLASS -7
WORKSHEET
A. Tick the correct option.
1. Dissolving the substance in a solvent is:
a. Synthesis b. Physical change
c. Chemical change d. Decomposition
2. Rusting of iron nail is a:
a. Chemical change b. Physical change
c. Temporary change d. Magnetic change
3. Which of these is a physical change?
a. Burning of a candle b. Rotting of fruit
c. Baking pancakes d. Water changing to ice
4. The process of coating zinc on iron article is:
a. Greasing b. Oiling
c. Galvanising d. Painting
5. The three states of matter are:
a. Solid, Gas, Sugar b. Sugar, Liquid, Gas
c. Salt, Liquid, Gas d. Solid, Liquid, Gas
B. Classify the following changes into physical and chemical change.
i. Bursting of cracker ______________________________
ii. Boiling of water ______________________________
iii. Photosynthesis ______________________________
iv. Respiration ______________________________
v. Inflation of balloon ______________________________
C. Match the following:
Column A Column B
i. Rusting a. Steel
ii. Neutralisation b. Smallest part of a substance
iii. Alloy c. Moist air
iv. Solvent d. Acid + Base
v. Molecule e. Water
D. ANSWER THE FOLLOWING QUESTIONS
1. Why setting of curd and burning of the paper considered as chemical change? Explain.
2. What is crystallization?
3. write the word equation for the following
a. Neutralization
b. Rusting of iron
c. Burning of magnesium.
WORKSHEET - RESPIRATION
A. Tick the correct option.
1. Fermentation is caused by:
a. Cockroach b. Human beings
c. Earthworm d. Yeast
2. The blind air sacs of bronchiole are:
a. Alveoli b. Spiracles
c. Bronchi d. Epiglottis
3. The muscular flap which guards the opening of windpipe:
a. Diaphragm b. Epiglottis
c. Glottis d. Alveoli
4. Inhalation and Exhalation are components of:
a. Respiration b. Circulation
c. Transpiration d. Breathing
5. Organisms that live without oxygen :
a. Bacteria b. Plants
c. Cockroach d. Human beings
B. Match the animals with their respiratory organ.
Column A Column B
i. Cockroach a. Gills
ii. Earthworm b. Lungs
iii. Fish c. Spiracles
iv. Amoeba d. Moist skin
v. Human beings e. Cell membrane
C. Fill the correct option:
i. __________ aerobic respiration/anaerobic respiration produces more energy.
ii. During exhalation, diaphragm __________ (relaxes/contracts).
iii. __________ (coughing/asthma) is an allergic disease.
iv. __________ (Gills/lungs) help the animals living in water to use the oxygen
dissolved in water.
v. Stomata help the plants __________ (to exchange gases/carries air to lungs).
D. Write ‘T’ for true and ‘F’ for false statement:
i. During inspiration, the ribcage moves upward and outward. ( )
ii. Breathing rate slows down during the time of exercise. ( )
iii. The thin walls of alveoli are richly supplied with blood. ( )
iv. During respiration, ADP is converted to ATP. ( )
v. In plants, all living cells take in oxygen independently and give
out carbon dioxide. ( )
WORKSHEET
A. Tick the correct option.
1. Dissolving the substance in a solvent is:
a. Synthesis b. Physical change
c. Chemical change d. Decomposition
2. Rusting of iron nail is a:
a. Chemical change b. Physical change
c. Temporary change d. Magnetic change
3. Which of these is a physical change?
a. Burning of a candle b. Rotting of fruit
c. Baking pancakes d. Water changing to ice
4. The process of coating zinc on iron article is:
a. Greasing b. Oiling
c. Galvanising d. Painting
5. The three states of matter are:
a. Solid, Gas, Sugar b. Sugar, Liquid, Gas
c. Salt, Liquid, Gas d. Solid, Liquid, Gas
B. Classify the following changes into physical and chemical change.
i. Bursting of cracker ______________________________
ii. Boiling of water ______________________________
iii. Photosynthesis ______________________________
iv. Respiration ______________________________
v. Inflation of balloon ______________________________
C. Match the following:
Column A Column B
i. Rusting a. Steel
ii. Neutralisation b. Smallest part of a substance
iii. Alloy c. Moist air
iv. Solvent d. Acid + Base
v. Molecule e. Water
D. ANSWER THE FOLLOWING QUESTIONS
1. Why setting of curd and burning of the paper considered as chemical change? Explain.
2. What is crystallization?
3. write the word equation for the following
a. Neutralization
b. Rusting of iron
c. Burning of magnesium.
WORKSHEET - RESPIRATION
A. Tick the correct option.
1. Fermentation is caused by:
a. Cockroach b. Human beings
c. Earthworm d. Yeast
2. The blind air sacs of bronchiole are:
a. Alveoli b. Spiracles
c. Bronchi d. Epiglottis
3. The muscular flap which guards the opening of windpipe:
a. Diaphragm b. Epiglottis
c. Glottis d. Alveoli
4. Inhalation and Exhalation are components of:
a. Respiration b. Circulation
c. Transpiration d. Breathing
5. Organisms that live without oxygen :
a. Bacteria b. Plants
c. Cockroach d. Human beings
B. Match the animals with their respiratory organ.
Column A Column B
i. Cockroach a. Gills
ii. Earthworm b. Lungs
iii. Fish c. Spiracles
iv. Amoeba d. Moist skin
v. Human beings e. Cell membrane
C. Fill the correct option:
i. __________ aerobic respiration/anaerobic respiration produces more energy.
ii. During exhalation, diaphragm __________ (relaxes/contracts).
iii. __________ (coughing/asthma) is an allergic disease.
iv. __________ (Gills/lungs) help the animals living in water to use the oxygen
dissolved in water.
v. Stomata help the plants __________ (to exchange gases/carries air to lungs).
D. Write ‘T’ for true and ‘F’ for false statement:
i. During inspiration, the ribcage moves upward and outward. ( )
ii. Breathing rate slows down during the time of exercise. ( )
iii. The thin walls of alveoli are richly supplied with blood. ( )
iv. During respiration, ADP is converted to ATP. ( )
v. In plants, all living cells take in oxygen independently and give
out carbon dioxide. ( )
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