PODAR INTERNATIONAL SCHOOL | ||
Revision Question Bank (2021-22) | ||
Std: VII | Answer Scheme | Subject: Science |
Portion:
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Section A | ||||
The full form of MCB is: | 1 | |||
Mini Circuit Breaker | ||||
Mini Connection Breaker | ||||
Miniature Connection Breaker | ||||
Miniature Circuit Breaker | ||||
ans: | (d) Miniature Circuit Breaker | |||
Ch 15: Electricity and its effects, Pg-254 | ||||
Read the statements given below and identify X and Y. X is a tiny pore in the seed coat through which water and oxygen enter during germination. Y is a part on the embryo beneath the cotyledons directly above the root. | 1 | |||
X-Micropyle, Y- Hypocotyl | ||||
X-Epicotyl , Y- Hypocotyl | ||||
X-Micropyle, Y- Epicotyl | ||||
X- Hypocotyl, Y- Micropyle | ||||
ans: | (a) X-Micropyle, Y- Hypocotyl | |||
Ch 11: Reproduction in plants, Pg-183 | ||||
Identify the part labelled as X in the given figure. | 1 | |||
Gong | ||||
Electromagnet | ||||
Soft iron strip | ||||
Spring | ||||
ans: | (b) Electromagnet | |||
Ch 15: Electricity and its effects, Pg-257 | ||||
Study the given passage and answer the following question. | 1 | |||
Tropical rainforests are characterised by heavy rainfall. The most abundant rainforests are situated on the south-western coast of Kerala. Some other parts in India where rainforests can be found are in the states of Assam, West Bengal, Meghalaya, Arunachal Pradesh, Nagaland, Tripura, Western Ghats and the Andaman and Nicobar Islands. Deciduous forests are so called because the trees of these forests seasonally shed all their leaves for about six to eight weeks. Trees in tropical deciduous forests lose their leaves in the dry season and regrow them in the rainy season. The deciduous forests are most commonly found on the eastern slopes of the Western Ghats, Kerala, Chotta Nagpur plateau, East Madhya Pradesh, South Bihar and West Odisha. | ||||
In which of the following place will you find deciduous forests? | ||||
Meghalaya | ||||
South Bihar | ||||
Arunachal Pradesh | ||||
Nagaland | ||||
ans: | (b) South Bihar | |||
Ch 17: Forests - Our Lifeline -285 | ||||
Study the given passage and answer the following question. | 1 | |||
Tropical rainforests are characterised by heavy rainfall. The most abundant rain forests are situated on the south-western coast of Kerala. Some other parts in India where rain forests can be found are in the states of Assam, West Bengal, Meghalaya, Arunachal Pradesh, Nagaland, Tripura, Western Ghats and the Andaman and Nicobar Islands. Deciduous forests are so called because the trees of these forests seasonally shed all their leaves for about six to eight weeks. Trees in tropical deciduous forests lose their leaves in the dry season and regrow them in the rainy season. The deciduous forests are most commonly found on the eastern slopes of the Western Ghats, Kerala, Chotta Nagpur plateau, East Madhya Pradesh, South Bihar and West Odisha. | ||||
Which of the given statement/s best describes tropical rainforests?
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Only I | ||||
Only II | ||||
Both I and II | ||||
Neither I and nor II | ||||
ans: | (b) Only II | |||
Ch 17: Forests - Our Lifeline -285 | ||||
Section B | ||||
For question number (i) and (ii), two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (I), (II), (III) and (IV) as given below: | ||||
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Assertion: It is very important that seeds get scattered away from the parent plant. Reason: Seeds of a plant compete with the parent plant for essential nutrients, space, sunlight, water and air. | 1 | |||
ans: | (I) Both A and R are true, and R is correct explanation of the assertion. | |||
Ch 11: Reproduction in Plants, Pg- 183 | ||||
Assertion: Air conditioners are fitted at the top in a room. Reason: When an air conditioner fitted at the top, is switched on, the air molecules close to the floor get cooled, they rise upwards and the hot air from the top sinks towards the floor. | 1 | |||
ans: | (III) A is true, but R is false. | |||
Ch 4: Heat and its transfer, Pg-61 | ||||
What is an aquifer? | 1 | |||
ans: | The reservoir of water that gets collected in the empty spaces between the water table and the bedrock is called the aquifer. | |||
Ch 16: Water - A precious Treasure, Pg-266 | ||||
Name the process of conversion of vapour into a liquid. | 1 | |||
ans: | Condensation | |||
Ch 16: Water - A precious Treasure, Pg-264 | ||||
What is the complex feeding system of interlocking and interdependent food chains called? | 1 | |||
ans: | Food web | |||
Ch 17: Forests - Our Lifeline -282 | ||||
Define the following terms: | 2 | |||
Reproduction | ||||
ans: | The process of producing offsprings (young ones) of their own kind is known as reproduction. | |||
1 mark | ||||
Ch 11: Reproduction in Plants, Pg- 170 | ||||
Perfect flower | ||||
ans: | A flower having both male and female reproductive parts is called a perfect flower. | |||
1 mark | ||||
Ch 11: Reproduction in Plants, Pg- 179 | ||||
State any three advantages of using mercury in a thermometer. | 3 | |||
ans: |
(accept any three points) | |||
3 marks | ||||
Ch 4: Heat and its transfer, Pg-52 | ||||
What is an electromagnet? | 5 | |||
ans: | An electromagnet is a device which behaves like a magnet until current is flowing through a solenoid. | |||
1 mark | ||||
Ch 15: Electricity and its effects, Pg-256 | ||||
Why are strong electromagnets used in heavy industrial cranes? | ||||
ans: | Strong electromagnets are used in heavy industrial cranes to lift, move and drop heavy iron and steel objects like cars. | |||
1 mark | ||||
Ch 15: Electricity and its effects, Pg-257 | ||||
State any three factors on which the amount of heat produced by the flow of current through a wire depends on. | ||||
ans: | The amount of heat produced by the flow of current through a wire depends upon the following factors.
(accept any three points) | |||
3 marks | ||||
Ch 15: Electricity and its effects, Pg-253 | ||||
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