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Free download in PDF CBSE Class 10 Science Quiz and Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE Class 10 Students.
161
We should reduce the use of the plastic bags, bottles etc. because:
[A]
They are not durable
[B]
They are non-biodegradable
[C]
They are made of toxic materials
[D]
They react with the atmospheric gases
Answer: They are non-biodegradable
162
Every food chain in the ecosystem begins with………. which are the original source of food.
[A]
Producers
[B]
Herbivores
[C]
Saprophytes
[D]
Parasites
163
If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be:
[A]
1 J
[B]
0.01 J
[C]
10 J
[D]
0.1 J
164
The substance which is chiefly responsible for the depletion of ozone layer is:
[A]
CFCs
[B]
O3
[C]
CH4
[D]
DDT
165
The quality of environment can be improved by-
[A]
Conservation
[B]
Erosion
[C]
Deforestation
[D]
Overuse of natural environment
166
Which of the following does not lead to the depletion of groundwater?
[A]
Process of afforestation
[B]
Process of deforestation
[C]
Establishing thermal power plants
[D]
Cultivation of high yielding varieties of crops
Answer: Process of afforestation
167
Sardar Sarovar Dam is situated on river:
[A]
Ganga
[B]
Narmada
[C]
Yamuna
[D]
Godavari
168
A chemical reaction does not involve:
[A]
Formation of new substances having entirely different properties than that of the reactants
[B]
Breaking of old chemical bonds and formation of new chemical bonds
[C]
Rearrangement of the atoms of reactants to form new products
[D]
Changing of the atoms of on element into those of another element to form new products
Answer: Changing of the atoms of on element into those of another element to form new products
169
Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of:
[A]
Lactic acid
[B]
Carbon dioxide
[C]
Hydrochloric acid
[D]
Fat
170
The plant hormone which triggers the fall of mature leaves and fruits from the plant body is:
[A]
Abscisic acid
[B]
Cytokinin
[C]
Auxin
[D]
Gibberellin
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