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CBSE Questions for Class 7 Biology Forests Our Lifeline Quiz 4 - MCQExams.com
CBSE
Class 7 Biology
Forests Our Lifeline
Quiz 4
Which of the following is not the name of a tree?
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Teak
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Sal
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Porcupine
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Kachnar
Explanation
Teak, Sal and Kachnar all are trees whereas Porcupine is a wild animal.
Thus, the correct answer is option (c),
Which of the following serve as green lungs?
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Green pigment of the plants
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Forests
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Kitchen gardens
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Green house gases
Explanation
Plants and trees work as green lungs because they are giving out oxygen and take carbon dioxide from us. Forests serve as green lungs.
Thus, the correct answer is option (b).
Seed dispersal can take place by
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Wind
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Water
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Animals
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All of the above
Explanation
Seed dispersal is the way seeds get from the parent plant to a new place.
It can take place by the means of:
(A) Wind - Seeds from plants like maple and cottonwood trees are light and have feathery bristles and can be carried long distances by the wind.
(B) Water - Many plants have seeds that use water as a means of dispersal. The seeds float away from the parent plant. If the seeds fall in the water, they are carried away by the tide to grow somewhere else.
(C) Birds/animals - Birds often fly far away from the parent plant and disperse the seeds in their droppings.
Hence, Option D- all of the above is correct.
A series of organisms in which an organism depends on the next organism for food is called _________.
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Food chain
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Food line
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Food wave
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Food production
Explanation
The food chain is the sequence of organisms in which each organism eats the lower member and itself is eaten by a higher member.
The food chain starts with the producer or plants that convert solar energy into the usable form of energy (food) by the process of photosynthesis which is then eaten by primary consumers like deer.
Primary consumers are eaten by secondary consumers like lions.
Thus, Option A is correct.
Which of the following does not lead to the depletion of groundwater?
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Afforestation
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Deforestation
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Cultivation of high yielding varieties of crops
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Establishing thermal power plants
Explanation
The planting of trees does not deplete the groundwater level.
Vegetation slows down the flow of rainwater on land and increases the absorption of water by the soil.
Both crops and thermal plants require a huge amount of water.
So, the correct answer is option A.
The forest keeps on growing, changing and can also they regenerate.
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True
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False
Explanation
The statement is true.
The forests keeps growing with time and energy flow. And can also change and regenerate according to the environmental conditions.
Correct options regarding the importance of forests in the ecosystem are?
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Protect soil and provide habitat to a large number of animals.
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Source of medicinal plants, timber and many other useful products.
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Forests help in bringing good rainfall in neighbouring areas.
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All of the above
Explanation
Forests play an important role in the ecosystem-
They provide oxygen.
Protect soil and provide habitat to a large number of animals.
Source of medicinal plants, timber and many other useful products.
Forests help in bringing good rainfall to neighbouring areas.
Thus, option D is correct.
Home of thousands of birds, animals and insects are lost due to_________.
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afforestation
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deforestation
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Both A and B
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None of the above
Explanation
Deforestation
is the permanent removal of trees to make room for something besides forest.
Therefore, home of thousands of birds, animals and insects are lost due to deforestation. Option B is correct.
Destruction in the Amazon rainforest is caused by?
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Cattle ranching
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Mining
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Logging
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All of the above
Explanation
Cattle ranching is the practice of raising cattle's on large tracts of land.
Cattle ranching depletes the land of nutrients because cattle often eat to the very dirt, destroying all biomass on a piece of land and making it very hard for the habitat to restore itself
Cattle ranching is the leading
cause
of
deforestation in the Amazon rainforest
.
Therefore, Option A is correct.
The forest acts as a natural absorber of rainwater and allows it to seep.
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True
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False
Explanation
The forest acts as a natural absorber of rainwater and allows it to seep. It helps maintain the water table throughout the year.
Forests not only help in controlling floods but also help maintain the flow of water in the streams so that we get a steady supply of water.
Hence, the above statement is true.
Forests must be cleared to make the human life safe and comfortable.
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True
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False
Explanation
There are other ways to lead a safe and comfortable life, rather than clearing forests. Clearing of forests will lead to more climatic and environmental destruction and will again effect the lifestyle of human being.
Therefore, the given statement is false.
Which organism will be affected in the absence of the decomposers?
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Plants
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Animals
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Insects
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All of these
Explanation
Decomposers are the organisms that play a critical role by breaking down and decomposing the body and release the element back to nature for other organisms. Thus they help in recycling the nutrients in the atmosphere. They also act as the cleaning agent of the environment because without them dead organisms will pile up. Thus in their absence all the organisms i.e., plants, animals, and insects will be affected. Thus, the correct answer is option D.
Which of the following shape of the crown is common in plants of cold areas?
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Conical
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Round
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Broad
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None of the above
Explanation
Conical shape is common for plants in cold regions. This shape helps to protect them from snowfall as the snow will slip off the plant quickly during winters, preventing accumulation of snow on the plant and decay of leaves.
So, the correct answer is '
Conical'
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Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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Assertion is correct but Reason is incorrect
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Both Assertion and Reason are incorrect
Explanation
Indian elephants can be found in a wide range of habitats, including grasslands, forests and also cultivated forests and scrubland. They are confined to terai and the foothills because of the availability of succulent grass and plenty of water.
So the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.
Forest floor is known as the floor for the animal habitat. Which of the following animals are present on the forest floor?
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Parrot
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Snakes
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Pigeon
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Dove
Explanation
The forest floor is also called detritus and O horizon. It is one of the features of a forest ecosystem. It is known as the floor of the animal habitat. It consists of shed vegetative parts like leaves, branches, stems. It exists above the soil surface. Usually, insects that feed on the leaf litter are found on it. Examples of animals found on the forest floor include snake, lizards, butterflies.
Thus, the correct answer is option B.
What is canopy?
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Uppermost level of the forest
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Ground level of the forest
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Soil in forest
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Climbers on trees
Explanation
A.Correct option -A
B.Explanation for correct option
-
The uppermost
layers in the forest form a roof-like structure known as canopy.
Which of the following forms the lowest layer of understoreys?
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Herbs
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Shrubs
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Trees
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None of the above
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