MEDIUM
7th CBSE
IMPORTANT
Earn 100

Describe a food web using an example. The web should contain at least three food chains. Each food chain should begin with producers and end with decomposers.

Important Questions on Forests: Our Lifeline

EASY
7th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 23 - Forests: Our Lifeline>EXERCISE>Q 3
Can we say that the sun is the ultimate source of energy for all living organisms? Explain.
EASY
7th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 23 - Forests: Our Lifeline>EXERCISE>Q 4
Discuss ways to bring about the conservation of forests.
EASY
7th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 23 - Forests: Our Lifeline>EXERCISE>Q 1

Two types of organisms found in a forest are A and B. Both organisms clean the forests in their own ways. Organism A eats the dead and decaying animals in the forest and organism B decomposes the plant and animal remains lying on the forest floor.

a. What is the term used to represent organism A? Give some examples.
b. What is the term used to represent organism B? Give one example.
c. Which of the two categories of organisms, A or B helps to release nutrients back in soil?

EASY
7th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 23 - Forests: Our Lifeline>EXERCISE>Q 2
Hunting and poaching of some animals such as rhinoceros in the forest have brought them on the verge of extinction. Is their extinction going to have any major impact on the environment as they are herbivores and do not have any predators.
EASY
7th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 23 - Forests: Our Lifeline>EXERCISE>Q 3
Why does the reduction in green cover result in floods?
EASY
7th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 23 - Forests: Our Lifeline>EXERCISE>DISCUSS
Is the land for agriculture that is prepared by clearing forest areas more important for human beings or the forests themselves? Give reasons for your choice.
MEDIUM
7th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 23 - Forests: Our Lifeline>EXERCISE>FUN ACTIVITIES
Draw lines to match different animals as different food chains to form a food web.
Question Image
MEDIUM
7th CBSE
IMPORTANT
Sciwise - A coursebook of Science>Chapter 23 - Forests: Our Lifeline>EXERCISE>SUBJECT CONNECT
A tree plantation drive was organized by a school. Students of the school and local people participated in the drive, and they planted different plant varieties in the nearby areas which were cleared off the trees due to human activities. The table given below shows the number and types of trees planted.
Plant type Number of trees planted
Populus trees 5000
Pine trees 3500
Eucalyptus 4000
Neem 1500