MCQ Questions for Class 10 Science Chapter 15 Our Environment with Answers

If you’re looking for a way to enhance your Class 10 Science Biology, then look no further than the NCERT MCQ Questions for Class 10 Science Chapter 15 Our Environment with Answers. MCQ Questions for Class 10 Science with Answers is perfect for those who are in Class 10 Biology and want to get ahead of everyone else by mastering their subject skills as soon as possible!

Our Environment Class 10 MCQs Questions with Answers

Solving Our Environment Multiple Choice Questions of Class 10 Science Chapter 15 MCQ can be of great help to students as they will be aware of all the concepts. These MCQ Questions on Our Environment Class 10 with answers pave for a quick revision, thereby helping you learn more about this subject.

Question 1.
Assertion: Vegetarian food habit is more beneficial to organisms.
Reason: Only 10% energy is available as food from one trophic level to next.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

(a) Both A and R are true and R is the correct explanation of A.


Question 2.
In natural ecosystems, decomposers include-
(a) only bacteria and fungi
(b) only microscopic animals
(c) herbivores and carnivores
(d) both (b) and (c)

Answer

(a) only bacteria and fungi


Question 3.
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about-
(a) 1%
(b) 8%
(c) 5%
(d) 10%

Answer

(a) 1%


Question 4.
The second trophic level is always of-
(a) herbivores
(b) autotrophs
(c) carnivores
(c) producers

Answer

(a) herbivores


Question 5.
The decomposers in an ecosystem-
(a) convert organic material to inorganic forms
(b) convert inorganic material to simpler forms
(c) convert inorganic material into organic compound
(d) do not break down organic compound

Answer

(a) convert organic material to inorganic forms


Question 6.
Which of the following is an abiotic component of an ecosystem?
(a) Humus
(b) Bacteria
(c) Plants
(d) Fungi

Answer

(a) Humus


Question 7.
What will happen if all the deer are killed in the given food chain?
Grass → Deer → Lion
(a) The population of grass decreases.
(b) The population of lions increases.
(c) The population of lions remains unchanged.
(d) The population of lions decreases and grass increases.

Answer

(d) The population of lions decreases and grass increases.


Question 8.
Which of the following is not a terrestrial ecosystem-
(a) forest
(b) desert
(c) aquarium
(d) grassland

Answer

(c) aquarium


Question 9.
In the garden ecosystem, which of the following are producers?
(a) Insects
(b) Snakes
(c) Grasses
(d) Rabbits

Answer

(c) Grasses


Question 10.
Which of the following is biodegradable?
(a) Plastic mugs
(b) Leather belts
(c) Silver foil
(d) Iron nails

Answer

(b) Leather belts


Question 11.
Which of the following is an autotroph?
(a) Lion
(b) Insect
(c) Tree
(d) Mushroom

Answer

(c) Tree


Question 12.
Which of the following is a logical sequence of food chain
(a) producer → consumer → decomposer
(b) producer → decomposer → consumer
(c) consumer → producer → decomposer
(d) decomposer → producer → consumer

Answer

(a) producer → consumer → decomposer


Question 13.
A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in
(a) green plants
(b) man
(c) birds
(d) fish

Answer

(b) man


Question 14.
Ozone layer is damaged by-
(a) methane
(b) carbon-dioxide
(c) Sulphur-dioxide
(d) CFCs

Answer

(d) CFCs


Question 15.
In an ecosystem, herbivores represent
(a) producers
(b) primary consumers
(c) secondary consumers
(d) decomposers

Answer

(b) primary consumers


Question 16.
Which one of the following will undergo fastest bio-degradation?
(a) Mango seed
(b) Wood
(c) Mango peel
(d) Mango pulp

Answer

(d) Mango pulp


Question 17.
Assertion: Biodegradable waste and non biodegradable waste should be discarded separately,
Reason: Biodegradable waste are not harmful.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

(c) A is true but R is false.


Question 18.
Assertion: Ozone layer is getting depleted at upper atmosphere which is a cause of concern.
Reason: CFC reacts with ozone and breaks it.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

(a) Both A and R are true and R is the correct explanation of A.


Question 19.
Flow of energy in an ecosystem is always-
(a) unidirectional
(b) bidirectional
(c) multidirectional
(d) no specific direction.

Answer

(a) unidirectional


Question 20.
The ecosystem of earth is known as-
(a) biome
(b) community
(c) biosphere
(c) association

Answer

(c) biosphere


Question 21.
Which of the two in the following sets belong to the same trophic level?
(a) Grass : Grasshopper
(b) Goat : Spider
(c) Hawk : Rat
(d) Frog : Lizard

Answer

(d) Frog : Lizard


Question 22.
Acid rain is caused by the oxides of
(a) carbon
(b) nitrogen only
(c) sulphur only
(d) sulphur and nitrogen

Answer

(d) sulphur and nitrogen


Question 23.
The depletion of the ozone layer causes
(a) global wanning
(b) earthquakes
(c) increased UV radiations
(d) acid rain

Answer

(c) increased UV radiations


Question 24.
Which one of the following pairs belong to the category of primary consumers?
(a) Eagle and snake
(b) Grasshoppers & cattle
(c) Snake and frog
(d) Water beetles & fish

Answer

(b) Grasshoppers & cattle


Question 25.
Which of the following is biodegradable?
(a) Aluminium can
(b) Polythene bag
(c) Cowdung
(d) DDT

Answer

(c) Cowdung


Question 26.
Which of the following is non-biodegradable-
(a) paper
(b) wood
(c) cloth
(d) plastic

Answer

(d) plastic


Question 27.
Trophic level in an ecosystem represents
(a) oxygen level
(b) water level
(c) energy level
(d) salt level

Answer

(c) energy level


Question 28.
Excessive exposure to ultraviolet radiation causes
(a) inflammation of liver
(b) cancer of skin
(c) damage to the lungs
(d) jaundice

Answer

(b) cancer of skin


Question 29.
Which of the following limits the number of trophic levels in a food chain?
(a) water
(b) polluted air
(c) deficient food supply
(d) decrease in energy at higher trophic levels

Answer

(d) decrease in energy at higher trophic levels


Question 30.
A food chain always starts with
(a) respiration
(b) photosynthesis
(c) decay
(d) nitrogen fixation

Answer

(b) photosynthesis


Question 31.
Which of the following is non- biodegradable?
(a) Wool
(b) Nylon
(c) Animal bones
(d) Tea leaves

Answer

(b) Nylon


Question 32.
First link in any food chain is usually green plants because
(a) they are widely distributed
(b) they are fixed at one place in the soil
(c) they alone have the capacity to synthesise food using sunlight
(d) there are more herbivores than carnivores

Answer

(c) they alone have the capacity to synthesise food using sunlight


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