In cockroaches, air enters the body through

1

(a)

lungs

(b)

gills

(c)

spiracles

(d)

skin

During the process of exhalation, the ribs move

1

(a)

down and inwards

(b)

up and inwards

(c)

down and outwards

(d)

up and outwards

Minimum loss of energy takes place while we are

1

(a)

walking

(b)

swimming

(c)

running

(d)

Sleeping

Yeasts are used in

1

(a)

wine and beer industry

(b)

bakery industry

(c)

Both (a) and (b)

(d)

None of these

Which of the following organism can respire anaerobically?

1

(a)

Amoeba

(b)

Yeast

(c)

Paramecium

(d)

Euglena

The roots of a plant take up oxygen from the ......... trapped between the............ particles.

1

(a)

air, soil

................is an essential phenomenon for the survival of living organisms

1

(a)

Breathing

Breathing rate of a person is not always ______

1

(a)

constant

Lungs are very..............organ

1

(a)

delicate

Wind pipe in humans is called_______

1

(a)

trachea

During heavy exercise, the breathing rate of a person slows down.

1

(a) True

(b) False

The fishes have lungs for respiration.

1

(a) True

(b) False

Living organism respire to get energy from food.

1

(a) False

(b) True

We take deep breathes after we hold on breath for the one minute.

1

(a) False

(b) True

The balance between CO₂ and O₂ is maintained by the plants.

1

(a) False

(b) True

Name the tiny pores is the leaves through which exchange of gases takes place.

1

(a)

Stomata.

What happens when breathed air is passed through lime water?

1

(a)

The lime water becomes milky because carbon dioxide changes limewater into milky limestone.

Why do all living organisms respire?

1

(a)

All living organisms respire to get energy from the food.

What is cellular respiration?

1

(a)

The process of breakdown of food in the cell with the release of energy is called cellular respiration

Name the breathing organs of cockroach and earthworm?

1

(a)

Breathing organ of cockroach: Tiny openings called spiracles.
Breathing organ of earthworm: moist skin

What are the end products of aerobic respiration.

2

(a)

Name the end products of anaerobic respiration in yeast.

2

(a)

Name the respiratory organs in frogs.

2

(a)

Explain cellular respiration.

2

(a)

When you feel drowsy, does your breathing rate slowdown?

2

(a)

1. Observe the given diagram of human respiratory system. List the organs from (A) to (G).
   

   5

   (a)

2. It is not wise to sleep under a tree during night. Why?

   5

   (a)

Distinguish between photosynthesis and respiration.

10

(a)