Activity 11.13 Class 9 Science Chapter 11
Activity 11.13 Class 9 Science
belongs to Chapter 11 Work and Energy Class 9 Science. You will get a
complete solution with an explanation and conclusion. After reading activity
11.13, you will be able to answer the questions based on the activity.
Activity 11.13 Class 9 Science Work and Energy
You are suggested to study NCERT activity 11.13 class 9 science
chapter 11Work and Energy explanation with a conclusion so that you can attempt
questions based on activity 11.13 class 9 science.
Activity 11.13 Class 9 Science
· Sit
in small groups.
· Discuss
various ways of energy conversions.
· Discuss the following questions in your group:
a. How
do green plants produce food?
b. Where
do they get their energy from?
c. Why
does the air move from place to place?
d. How
are fuels such as coal and petroleum formed?
e. What
type of energy conversions sustain the water cycle?
Observation and explanation of activity 11.13 class 9 science
a. Green
plants produce food by photosynthesis.
b. Green
plants get their energy direct from the sun and convert it into chemical energy.
c. The
air moves from one place to the other because of differences in air pressure of
two regions on the earth.
d. Coal
and petroleum are the products of dead remains of plants, and animals that died
millions of years ago and got buried under the earth where due to the action of bacteria
and physical factors like pressure and temperature, they got converted into
coal and petroleum.
e. Conversion
of solar energy into potential energy of water vapour and conversion of the potential energy of clouds into the kinetic
energy of water flowing in rivers.
Conclusion of activity 11.13 class 9 science
It can be concluded that different forms of energy can
be interconverted. These conversions are responsible for various functions of nature.
Related Topics
1. Activity 11.14 Class 9 Science
2. Activity 11.12 Class 9 Science
2. NCERT Solutions of chapter 11
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