A. Tick the correct answer:-

1. C 2. A 3. A 4. D 5. C 

B. Differentiate between the following:-

1. Photosynthesis produces Oxygen and its opposite respiration gives carbon dioxide.

2. Breathing is an external process and respiration is inner one.

3. Aerobic respiration takes place in presence of Oxygen and produces carbon dioxide.

       Anaerobic respiration produces ethyl alcohol or lactic acid.

4. Trachea is an organ outside lungs and bronchioles exist inside lungs.

5. Stroma are stomata in plants and diffusion from body surface of earthworm.

C. Give one word answer for each of the following:-

1. Aerobic respiration 2. Spiracles 3. Respiration 4. Aerobic 5. Epiglottis 

D. Match column A with column B:-

1. Spiracles 2. Skin 3.Lungs and skin 4. Lungs

5. Gills 

E. Make the diagrams for the following:-

1. 



2.  



3. 




F. Give reasons for each of the following:-

1. It support aerobic respiration.

2. Microorganism will not exist.

3. Helps in respiration of aquatic animals and plant.

4. Frogs breathing organ remain over skin is called glottis i.e larynx.

G. Write true or false:-

1. False 2. False 3. False 4. True 5. False 6. True 

H. Circle the odd one out:-

1. Giils 2. Amoeba 3. Frog 4. Energy 

I. Fill in the blanks:-

1. Breathing 2. The sun 3. Fermentation 4. Cockroach 5. Grill 

J. Short answer questions:-

1. Inhaled means intake and exheld air is its opposite.

2. All living organisms get energy from oxidation of glucose.

3. Stomata is opening in guard cells through which air and water can move.

4. The number of times a person breathe in one minute is called breathing rate. Normal breathing rate is 15 to 18 per minute.

5. Plants can respire through leaves, branch or stem.

6. Fish respire through gills.

7. Organs are-

a. Nasal cavity 

b. Pharynx 

c.Windpipe 

d. Trachea

e. Bronchus 

f. Bronchiole.

K. Long answers questions:-

1. Aerobic respiration

Occurs in presence of oxygen ,releases more energy.

Anaerobic respiration 

Text place in absence of oxygen, releases less energy.

2. Plants also need energy to grow and perform life functions. Plants that this energy through respiration. Plants use atmospheric oxygen to break down glucose  into carbon dioxide and water, with release of energy. The exchange of gases in plants is done by simple process of diffusion. Which stomata is enclosed by two guard cells. Entry and removal of Oxygen and Carbon dioxide takes place by opening and closing of guard cells.

3. 




4. Breathing

It is a physical process ,no energy is released 

Cellular respiration

It is a chemical process 

example glucose + oxygen ---> carbon dioxide + water + energy

Energy is released.

5.