How Nature Works in Harmony Class 8 MCQ Questions Science Chapter 12

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Class 8 How Nature Works in Harmony MCQ with Answers

MCQ on How Nature Works in Harmony Class 8

Class 8 Science Chapter 12 How Nature Works in Harmony MCQ Questions with Answers

Question 1.
Which of the following ecosystems is human made?
(a) Forest
(b) Pond
(c) Grassland
(d) Agricultural field
Answer:
(d) Agricultural field

Question 2.
Given below are names of some animals:
(i) Goat
(ii) Human beings
(iii) Cockroach
(iv) Eagle
Which of the above animals form a pair of omnivores?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iv)
Answer:
(b) (ii) and (iii)

Question 3.
What does a food web represent? (NCERT Exemplar)
(a) A single food chain
(b) All producers in an ecosystem
(c) Interconnected food chains in an ecosystem
(d) Only carnivores and herbivores
Answer:
(c) Interconnected food chains in an ecosystem

Question 4.
Why do elephants enter villages and farms?
(a) To migrate to another country
(b) For rest and shelter
(c) Due to the scarcity of food and water in their natural habitat
(d) Because they like human company
Answer:
(c) Due to the scarcity of food and water in their natural habitat

Question 5.
Choose the set that represents only the biotic components of a habitat.
(a) Tiger, Deer, Grass, Soil
(b) Rocks, Soil, Plants, Air
(c) Sand, Turtle, Crab, Rocks
(d) Aquatic plant, Fish, Frog, Insect
Answer:
(d) Aquatic plant, Fish, Frog, Insect

Question 6.
What is the correct sequence in the ecological levels from smallest to largest?
(a) Ecosystem → Community → Population
(b) Population → Community → Ecosystem
(c) Community → Population → Ecosystem
(d) Population → Ecosystem → Community
Answer:
(b) Population → Community → Ecosystem

Question 7.
What is monoculture in farming?
(a) Using only organic compost
(b) Growing many crops at once
(c) Growing the same crop repeatedly on the same land
(d) Raising animals and crops together
Answer:
(c) Growing the same crop repeatedly on the same land

How Nature Works in Harmony Class 8 Assertion-Reason Type Questions

Use the following key to choose the appropriate answer.
(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.

Question 1.
Assertion (A): Overuse of pesticides can lead to a decrease in soil fertility.
Reason (R): Pesticides increase the number of soil microbes.
Answer:
(c) A is true but R is false

Question 2.
Assertion (A): Fox is an omnivore.
Reason (R): Fox feeds on both plants and animals.
Answer:
(a) Both A and R are true and R is the correct explanation of A

Question 3.
Assertion (A): Deforestation increases the number of wild animals.
Reason (R): Forests provide shelter and food to wildlife.
Answer:
(d) A is false but R is true

Question 4.
Assertion (A): A single change in an ecosystem can lead to multiple effects.
Reason (R): All components in an ecosystem are interlinked.
Answer:
(a) Both A and R are true and R is the correct explanation of A

Question 5.
Assertion (A): Commensalism means both organisms benefit equally.
Reason (R): In commensalism, nejther organism is harmed.
Answer:
(d) A is false but R is true

How Nature Works in Harmony Class 8 Fill in the blanks

Question 1.
A ……….. is a simple sequence showing ‘who eats whom’ in an ecosystem.
Answer:
food chain

Question 2.
The small green leafy structures of flowers are known as …………
Answer:
sepals

Question 3.
Sea water, hot air, and sand are ……….. components of a habitat.
Answer:
abiotic

Question 4.
Organisms that cannot make their food and depend on others are called …………
Answer:
consumers or heterotrophs

Question 5.
A group of organisms of the same species living together in a habitat is called a …………
Answer:
population

How Nature Works in Harmony Class 8 True or False

Question 1.
Producers (like green plants) are at the second trophic level in a food pyramid.
Answer:
False

Question 2.
Water, temperature, and sunlight are abiotic factors.
Answer:
True

Question 3.
Orchids growing on trees is an example of parasitism.
Answer:
False

Question 4.
Pesticide overuse can kill helpful soil organisms.
Answer:
True

Question 5.
Overfishing in a pond can lead to an increase in dragonflies and a decrease in pollinators.
Answer:
True

How Nature Works in Harmony Class 8 Match the following

Question 1.

Column A	Column B
(i) Producer	(p) Breaks down dead matter
(ii) Consumer	(q) Non-living part (e.g., water, soil)
(iii) Decomposer	(r) Makes its food (e.g., tree)
(iv) Abiotic	(s) Living part (e.g., bird, plant)
(v) Biotic component	(t) Depends on other organisms for food

Answer:

Column A	Column B
(i) Producer	(r) Makes its food (e.g., tree)
(ii) Consumer	(t) Depends on other organisms for food
(iii) Decomposer	(p) Breaks down dead matter
(iv) Abiotic	(q) Non-living part (e.g., water, soil)
(v) Biotic component	(s) Living part (e.g., bird, plant)