The pair of reactions show the formation of ozone (O₃). What is the role of ultraviolet (UV) rays in the reaction?

The ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet's surface. Most importantly, it absorbs the portion of UV light called UVB. UVB is a kind of ultraviolet light from the sun (and sun lamps) that has several harmful effects. In the given reaction UV rays helps in the splitting oxygen molecules into free oxygen.

Alisha digs a pit in her garden and puts the following items in it. paper cups glass bowls fruit peels rubber slippers She then covers the pit with soil. Which item will decompose first?

Alisha digs a pit in her garden and puts paper cups, glass bowls, fruit peel, and rubber slippers, and then covers the pit with soil. Among these substances, biodegradable substances have been decomposed by the activity of microorganisms present in the soil and in the surrounding atmosphere and have been converted into compost. Among these substances fruit peels will decompose first due to the rate of decomposition.

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Science Textbook of Competency Based Questions for Class X>Chapter 15 - Our Environment>Exercise>Q 1

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The table shows some organisms and their food sources in an ecosystem.

Organism Food source

Frog Cricket, Grasshopper

Cricket Grass

Snake Frog, Shrew

Shrew Cricket, Grasshopper

Grasshopper Grass

Eagle Snake, Shrew

Identify the primary consumer(s) in the ecosystem.

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Important Questions on Our Environment

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Science Textbook of Competency Based Questions for Class X>Chapter 15 - Our Environment>Exercise>Q 2

A snake eats a frog. What percentage of energy of the frog is transferred to the snake?

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Science Textbook of Competency Based Questions for Class X>Chapter 15 - Our Environment>Exercise>Q 3

Which of these represents the complete and correct food web of the ecosystem?

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Science Textbook of Competency Based Questions for Class X>Chapter 15 - Our Environment>Exercise>Q 4

Which organism has the largest biomass in the ecosystem?

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Science Textbook of Competency Based Questions for Class X>Chapter 15 - Our Environment>Exercise>Q 5

The picture shows the different trophic levels of an ecosystem.

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Which level consists of herbivores?

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Science Textbook of Competency Based Questions for Class X>Chapter 15 - Our Environment>Exercise>Q 6

The pair of reactions show the formation of ozone (O₃).

Question Image

What is the role of ultraviolet (UV) rays in the reaction?

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Science Textbook of Competency Based Questions for Class X>Chapter 15 - Our Environment>Exercise>Q 7

The ozone layer of the atmosphere shields the Earth’s surface from the ultraviolet radiations of the Sun. Which of these is likely to increase in humans with depletion of the ozone layer?

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Science Textbook of Competency Based Questions for Class X>Chapter 15 - Our Environment>Exercise>Q 8

Alisha digs a pit in her garden and puts the following items in it.