Class 10 Biology Master Quiz: Our Environment (CBSE 2024-25)

Question 1

Which of the following is an abiotic component of an ecosystem?

Accepted Answer

Humus

Answer

Bacteria

Answer

Plants

Answer

Fungi

Question 2

In a food chain, the third trophic level is always occupied by:

Accepted Answer

Carnivores

Answer

Herbivores

Answer

Producers

Answer

Decomposers

Question 3

According to the $10\%$ Law, if $1000	ext{ J}$ of solar energy is trapped by producers, how much energy will be available to the next trophic level?

Accepted Answer

$10	ext{ J}$

Answer

$100	ext{ J}$

Answer

$1	ext{ J}$

Answer

$1000	ext{ J}$

Question 4

Which of the following is a non-biodegradable waste?

Accepted Answer

Plastic bottles

Answer

Paper

Answer

Vegetable peels

Answer

Cotton cloth

Question 5

The formation of Ozone ($O_3$) in the upper atmosphere is a result of:

Accepted Answer

Action of $UV$ rays on $O_2$

Answer

Action of $IR$ rays on $O_2$

Answer

Combination of $O_2$ and $CO_2$

Answer

Accumulation of $CFCs$

Question 6

What happens if all the deer are removed from a food chain: Grass $\rightarrow$ Deer $\rightarrow$ Tiger?

Accepted Answer

The population of tigers decreases and grass increases

Answer

The population of tiger increases

Answer

The population of grass decreases

Answer

The tiger starts eating grass

Question 7

Biological magnification refers to:

Accepted Answer

Increase in the concentration of harmful chemicals at successive trophic levels

Answer

Increase in body size of organisms in a food chain

Answer

Increase in the number of organisms in a population

Answer

Growth of plants due to fertilizers

Question 8

Which of the following groups contain only biodegradable items?

Accepted Answer

Fruit peels, cake, and lime juice

Answer

Grass, flowers, and leather

Answer

Grass, wood, and plastic

Answer

Cake, wood, and grass

Question 9

The flow of energy in an ecosystem is always:

Accepted Answer

Unidirectional

Answer

Bidirectional

Answer

Cyclic

Answer

Multidirectional

Question 10

Ozone layer depletion is mainly caused by:

Accepted Answer

Chlorofluorocarbons ($CFCs$)

Answer

Carbon monoxide

Answer

Methane

Answer

Pesticides

Question 11

If an organism is a producer, it belongs to the:

Accepted Answer

First trophic level

Answer

Second trophic level

Answer

Third trophic level

Answer

Fourth trophic level

Question 12

In an ecosystem, herbivores represent:

Accepted Answer

Primary consumers

Answer

Secondary consumers

Answer

Tertiary consumers

Answer

Producers

Question 13

Which of the following is an artificial ecosystem?

Accepted Answer

Crop field

Answer

Forest

Answer

Pond

Answer

Lake

Question 14

The percentage of solar energy captured by autotrophs for synthesis of food is about:

Accepted Answer

$1\%$

Answer

$10\%$

Answer

$100\%$

Answer

$50\%$

Question 15

Decomposers in an ecosystem:

Accepted Answer

Convert organic material to inorganic forms

Answer

Convert inorganic material to organic compounds

Answer

Trap solar energy and convert it into chemical energy

Answer

Do not depend on other organisms for food

Question 16

Global warming is mainly due to the accumulation of:

Accepted Answer

$CO_2$

Answer

$O_3$

Answer

$SO_2$

Answer

$N_2$

Question 17

What is the functional unit of the environment?

Accepted Answer

Ecosystem

Answer

Genotype

Answer

Population

Answer

Community

Question 18

Excessive exposure of humans to $UV$ rays results in:

Accepted Answer

Both (A) and (B)

Answer

Damage to the immune system

Answer

Skin cancer

Answer

Peptic ulcers

Question 19

Which of the following limits the number of trophic levels in a food chain?

Accepted Answer

Decrease in energy at higher trophic levels

Answer

Deficient food supply

Answer

Polluted air

Answer

Water availability

Question 20

A food web is:

Accepted Answer

Interlinked food chains

Answer

A straight chain of organisms

Answer

A list of endangered species

Answer

A group of producers

Question 21

Calculate the energy available to a hawk (fourth trophic level) if the grass (first trophic level) has $10,000	ext{ J}$ of energy.

Accepted Answer

$10	ext{ J}$

Answer

$100	ext{ J}$

Answer

$1	ext{ J}$

Answer

$0.1	ext{ J}$

Question 22

Which chemical was banned to prevent ozone depletion?

Accepted Answer

$CFCs$

Answer

$DDT$

Answer

$CH_4$

Answer

$CO_2$

Question 23

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the:

Accepted Answer

Food web

Answer

Ecological pyramid

Answer

Ecosystem

Answer

Food chain

Question 24

Why should we use paper bags instead of plastic bags?

Accepted Answer

Paper is biodegradable

Answer

Paper is stronger than plastic

Answer

Plastic is cheaper

Answer

Paper bags can be made in different colors

Question 25

In the following food chain, who gets the maximum energy?
Grass $\rightarrow$ Insects $\rightarrow$ Frog $\rightarrow$ Snake $\rightarrow$ Eagle

Accepted Answer

Grass

Answer

Insects

Answer

Snake

Answer

Eagle

Question 26

Which of the following is responsible for the movement of $DDT$ in the food chain?

Accepted Answer

Biomagnification

Answer

Biodegradation

Answer

Eutrophication

Answer

Photosynthesis

Question 27

Disposable plastic cups were replaced by "Kulhads" (clay cups) and then by paper cups in trains. What is the main reason for using paper cups over "Kulhads"?

Accepted Answer

Making Kulhads uses topsoil which is fertile

Answer

Paper cups are cheaper

Answer

Paper cups are more hygienic

Answer

Kulhads are heavy

Question 28

If the energy available at the producer level is $100\%$, what is the percentage of energy available at the secondary consumer level?

Accepted Answer

$1\%$

Answer

$10\%$

Answer

$0.1\%$

Answer

$0.01\%$

Question 29

Which of the following is an example of a scavenger?

Accepted Answer

Vulture

Answer

Lion

Answer

Cow

Answer

Green plant

Question 30

What is the primary cause of the "Ozone hole" discovered over Antarctica?

Accepted Answer

Use of $CFCs$ in refrigeration

Answer

Volcanic eruptions

Answer

Deforestation

Answer

Global warming

Questions in this Quiz

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Class 10 Biology Master Quiz: Our Environment (CBSE 2024-25)

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