CLASS 7 LESSON : RESPIRATION IN ORGANISMS.

I. Fill in the blanks:

1. Breathing is a part of _________________.

2. Breathing involves the movement of the ___________ and ______________.

3. The food has ____________ which is released during respiration.

4. The accumulation of ___________ causes muscle cramps.

5. Yeast can survive in absence of oxygen, they are called ___________.

6. The taking in of air rich in oxygen into the body is called ____________.

7. _____________is the food which is broken down in respiration to release energy.

II. Write true or false:

1. Cellular respiration takes place in all the cells of living organisms.

2. All living organisms respire to get energy from food.

3. Our muscle cells do anaerobic respiration only when there is temporary deficiency of oxygen.

4. Breathing involves the movement of the diaphragm and the rib cage.

5. Whales and dolphins have gills for breathing.

6. Gills are projections of the skin.

7. The percentage of carbon dioxide is higher in inhaled air in comparision to exhaled air.

8. We often feel hungry after a physical exercise.

9. Increased physical activity reduces the rate of breathing.

10. Elephants, snakes and birds have lungs for breathing

III Name the following:-

       a) Inside the cells the breaking of food into water and carbon di oxide

       b) Cockroach breathe by these structures

       c) In fishes these are the breathing structures.

       d) The products formed as a result of glucose breakdown

       e) The type of respiration taking place in our muscles.

        f) A large muscular sheet that forms the floor of the chest cavity

IV Fill in the blanks:-

       i)I f the food is broken with the help of oxygen , it is called as ------------.

       ii) In earthworm exchange of gases takes place through----------

       iii) A cell is the smallest ------- and ----------- unit.

       iv) during breathing ----------- and ------------ take place alternately.

       v) Leaves have tiny pores called ----------.

V Why do all organisms respire?

VI What is the difference between aerobic and anaerobic respiration .Write equations for both.

VII Why are yeasts used to make wine and bear?

VIII Why do we get muscle cramps after heavy exercise?

IX Draw and label a neat diagram of human respiratory system.

X What would happen if a potted plant is over watered

XI.How is respiration different from breathing?