Page 73 - Science Class 07

5. Breathing is completed in the phase namely _______________ and _______________ .
6. _______________ is released from the lungs into the atmosphere during exhala on.

C. Match the following columns.
Column I Column II
1. Trachea a. Pink sponges

2. Larynx b. Respiratory exchanges
3. Bronchi c. Wind pipe
4. Lungs d. Rectangular chambers
5. Alveoli e. Lower part of tracheae

D. Very short answer ques ons.
1. Why do plants take in CO ?
2
2. What do you mean by stomata?

3. What is aerobic respira on?
4. What is nasal cavity?
5. What is alveoli?
6. What is exhala on?

E. Short answer ques ons.
1. Why respira on is important for human beings?
2. Differen ate between aerobic and anaerobic respira on.
3. What is fermenta on ? Write its uses.

4. Describe the organs which our lungs contain.
5. Describe the process of internal respira on.
F. Long answer ques ons.
1. Describe breathing with diagram.

2. How many types of respira on are there? Explain.
3. Explain the mechanism of respira on.
4. How does the respira on take place in animals? Explain with examples.

5. Explain the respira on in plants.

Project ActivityActivityActivity
Project
Project
Project Activity
Take a glass tumbler filled with water. Put some lime stone into it. S r the water with the help of a
wooden stick. Now, take a glass straw and blow air into the glass tumbler. You will observe that the
column of water turns white. This ac vity shows that we release CO during respira on. Carry on
2
this ac vity at home and write your observa on.

HO
HO
HOTSTSTS
HOTS
A. Why do you think we yawn when we are sleepy or drowsy?
B. When you run, your breathing becomes faster, as you need more oxygen, but why does your
rate of heartbeat also increase?

Science-7 73