NCERT Solutions For Class 10 Science Chapter 15: Our Environment

The NCERT Solutions for Class 10 Science Chapter 15 Our Environment are provided in the article below. It covers all the important definitions, concepts, and methodologies that will be really beneficial for the students. The important topics that are included in this chapter are:

Eco-system
Environmental problems
Ozone depletion
Biodegradable and non-biodegradable substances

Expected no. of Questions: 2-3 questions of around 5 marks.

Download PDF: NCERT Solutions for Class 10 Science Chapter 15 Our Environment

NCERT Solutions for Class 10 Science Chapter 15

Class 10 Science Chapter 15 Our Environment: Important Topics

The word environment originated from the French word “environ” which means surrounding. Thus, the environment can be defined as all the living and nonliving things that surround us and are responsible for nourishing the life that exists on earth. All the organisms, plants, human beings and natural resources such as water, soil, and physical interactions form an important aspect of our environment. Due to rising concerns such as global warming, pollution, deforestation and climate change, there is a need to conserve and protect our environment from further destruction.

Ecosystem

An ecosystem is referred to as a geographic area where plants, animals, and other organisms, even weather, and landscape, work together to form a life. Ecosystems comprise biotic or living, parts, as well as abiotic factors, or nonliving parts. Biotic factors include plants, animals, and other organisms.

Biodegradable and non-biodegradable substances

Biodegradable substances are substances that can be easily broken down by the action of bacteria. Other substances or materials like plastics, metallic cans, and pesticides that cannot be broken down easily by biological processes are named non-biodegradable substances.

Chapter Related Links:

Ecosystems	Types of Ecosystem	Components of the ecosystem
Food Web	Food Chain	Difference Between Food Chain and Food Web
Ozone Layer and How it is getting depleted	Biodegradable and non-biodegradable substances	Ozone Layer

Science Study Guides:

Physics Constants	Periodic Table	Named Reactions
Difference between in physics	Class 10 Science Notes	Difference between in chemistry

CBSE X Related Questions

1.
Due to change in length and area of cross-section of a conductor, resistance of conductor changes while resistivity does not change. Why ?
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2.
How many bulbs of resistance \( 8 \ \Omega \) each should be connected in parallel combination to draw a current of \( 2 \text{ A} \) from a battery of \( 4 \text{ V} \) ?
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3.
(a) Study the given electric circuit in which 2 A electric current is flowing between points X and Y.

(i) Using the battery, key, voltmeter and ammeter in this given electric circuit, redraw a circuit diagram in which 2 \(\Omega\) and 4 \(\Omega\) resistors are connected between X and Y in parallel combination.
(ii) Circuit drawn by you, in which resistors are connected in parallel combination, calculate the electric current flowing through 4 \(\Omega\) resistor.
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4.
Assertion (A): Reflex actions do not involve thinking.
Reason (R): Most reflex actions are controlled by the spinal cord.
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Assertion (A) is false, but Reason (R) is true.
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5.
Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ?
Gamete carrying X chromosome from female parent.
Gamete carrying X chromosome from male parent.
Gamete carrying Y chromosome from male parent.
- (ii) and (iii)
- (i) only
- (i) and (iii)
- (iii) only
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6.
A convex lens of focal length 15 cm, is forming a real image. If the size of image is same as the size of object, then position of object and position of image will be, respectively :
- \(-15 \, \text{cm and} -15 \, \text{cm from lens}\)
- \(-15 \, \text{cm and} +15 \, \text{cm from lens}\)
- \(-30 \, \text{cm and} +30 \, \text{cm from lens}\)
- \(-30 \, \text{cm and} -30 \, \text{cm from lens}\)
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