biology MCQs - 11th class Chapter 13 Mcqs

1

Organismic respiration is also known as breathing or what?

A

Ventilation

B

Cellular Respiration

C

Diffusion

D

Metabolism

2

Which molecule is the main form of biologically useful energy produced during cellular respiration?

A

Glucose

B

Oxygen

C

ATP

D

Carbon Dioxide

3

Oxygen diffuses how many times more quickly in air than in water?

A

50 times

B

200 times

C

8000 times

D

12000 times

4

In terms of viscosity, water is how many times more viscous than air?

A

20 times

B

50 times

C

100 times

D

1000 times

5

What are the special pores in the cork tissue of older stems used for gaseous exchange called?

A

Stomata

B

Guard cells

C

Lenticels

D

Air spaces

6

Approximately how many stomata are present per square centimeter on a Tobacco plant leaf surface?

A

8000

B

10000

C

12000

D

20000

7

The respiratory activity that occurs in plants during the daytime is called what?

A

Photosynthesis

B

Transpiration

C

Cellular Respiration

D

Photorespiration

8

What is the most abundant protein in the world, involved in photorespiration?

A

Haemoglobin

B

Myoglobin

C

Rubisco

D

Actin

9

In photorespiration, RuBP reacts with oxygen to produce which two-carbon compound?

A

Glycine

B

Serine

C

Glycolate

D

Glycerate

10

In the mitochondria during photorespiration, two molecules of glycine are converted into serine and what else?

A

Oxygen

B

ATP

C

NADPH

D

Carbon dioxide

11

Photorespiration reduces the amount of carbon fixed into carbohydrates by approximately how much?

A

10%

B

15%

C

25%

D

50%

12

What is NOT a key feature of respiratory surfaces in most animals?

A

Large surface area

B

Thick epithelium

C

Moisture

D

Capillary network

13

In Hydra, where does the exchange of gases occur?

A

Only through the general surface

B

Only in the digestive cavity

C

Through specialized gills

D

Through the entire general surface and cells lining the digestive cavity

14

In earthworms, oxygen combines with which pigment in the blood to form oxyhaemoglobin?

A

Myoglobin

B

Haemocyanin

C

Chlorocruorin

D

Haemoglobin

15

The respiratory system of a cockroach consists of branching air tubules called what?

A

Bronchioles

B

Alveoli

C

Tracheae

D

Spiracles

16

How many pairs of spiracles are present on a cockroach's body?

A

8 pairs

B

10 pairs

C

12 pairs

D

16 pairs

17

In a cockroach, the fine, thin-walled tubules that directly supply oxygen to tissues are called?

A

Tracheae

B

Spiracles

C

Tracheoles

D

Bronchi

18

What is the main respiratory organ in fish?

A

Lungs

B

Skin

C

Gills

D

Tracheae

19

In fish, the protective cover over the gills is called the?

A

Operculum

B

Gill arch

C

Gill raker

D

Gill filament

20

The heart of a fish has how many circuits for blood flow?

A

Single circuit

B

Double circuit

C

Triple circuit

D

Partial circuit

21

Gaseous exchange through the skin in a frog is known as?

A

Pulmonary respiration

B

Buccal respiration

C

Cutaneous respiration

D

Tracheal respiration

22

In birds, the chief sites of gaseous exchange are tiny, thin-walled ducts called what?

A

Alveoli

B

Parabronchi

C

Air sacs

D

Bronchioles

23

How many air sacs do most birds have?

A

Four

B

Six

C

Nine

D

Twelve

24

The structure that prevents food from entering the larynx during swallowing is the?

A

Glottis

B

Pharynx

C

Epiglottis

D

Vocal cord

25

The opening of the larynx is called the?

A

Epiglottis

B

Glottis

C

Pharynx

D

Trachea

26

The walls of the trachea are supported by C-shaped rings made of what?

A

Bone

B

Smooth muscle

C

Elastic tissue

D

Cartilage

27

What is the functional unit of the lungs?

A

Bronchiole

B

Alveolus

C

Air-sac

D

Pleura

28

The floor of the chest cavity in humans is a sheet of skeletal muscle called the?

A

Intercostal muscle

B

Diaphragm

C

Pleura

D

Abdominal wall

29

During inspiration in humans, the diaphragm muscles contract and its shape becomes?

A

More domelike

B

Less domelike

C

S-shaped

D

Unchanged

30

What is the normal breathing rate for a human at rest?

A

5-10 times per minute

B

10-15 times per minute

C

15-20 times per minute

D

25-30 times per minute

31

Respiratory distress syndrome in premature infants is caused by a lack of what substance?

A

Haemoglobin

B

Mucus

C

Plasma

D

Surfactant

32

The maximum amount of oxygen that normal human blood can carry is about?

A

10ml/100ml

B

15ml/100ml

C

20ml/100ml

D

25ml/100ml

33

Which enzyme in red blood cells facilitates the rapid combination of CO2 with water?

A

Rubisco

B

Pepsin

C

Amylase

D

Carbonic anhydrase

34

What percentage of carbon dioxide is transported in the blood as carboxyhaemoglobin?

A

5%

B

20%

C

70%

D

95%

35

What percentage of carbon dioxide is transported as bicarbonate ions?

A

20%

B

50%

C

70%

D

85%

36

Arterial blood contains about 50 ml of CO2 per 100 ml of blood, while venous blood contains how much?

A

46 ml

B

50 ml

C

54 ml

D

60 ml

37

Which respiratory disorder is caused by the bacterium Mycobacterium tuberculosis?

A

Asthma

B

Emphysema

C

Lung Cancer

D

Tuberculosis

38

Which respiratory disorder is characterized by a breakdown of the alveoli walls?

A

Asthma

B

Emphysema

C

Tuberculosis

D

Bronchitis

39

Asthma is an allergic reaction that causes severe contraction of the?

A

Trachea

B

Large bronchi

C

Alveoli

D

Small bronchiole tubes

40

Haemoglobin increases the oxygen-carrying capacity of blood by about how many times?

A

25 times

B

50 times

C

75 times

D

100 times

41

What is the name for the haemoglobin-like pigment found in muscle fibers?

A

Haemocyanin

B

Myoglobin

C

Chlorocruorin

D

Cytochrome

42

The affinity of myoglobin to combine with oxygen is _______ as compared to haemoglobin.

A

lower

B

the same

C

much higher

D

slightly lower

43

During the diving reflex, the heart rate slows down to about what fraction of the normal rate?

A

one half

B

one third

C

one fifth

D

one tenth

44

What is the total inside capacity of fully inflated adult human lungs?

A

1.5 litres

B

3.5 litres

C

5 litres

D

7 litres

45

The volume of air that cannot be expelled from the lungs, even during exercise, is called?

A

Tidal volume

B

Vital capacity

C

Residual volume

D

Total capacity

46

What is the percentage of oxygen in inhaled air?

A

16%

B

21%

C

79%

D

0.04%

47

What is the percentage of oxygen in exhaled air?

A

21%

B

4%

C

16%

D

79%

48

The main tracheal trunk in a cockroach communicates with the exterior by 10 pairs of apertures called?

A

Tracheoles

B

Lenticels

C

Gills

D

Spiracles

49

The process where RuBP fixes oxygen instead of carbon dioxide is?

A

Calvin Cycle

B

Glycolysis

C

Photorespiration

D

Cellular Respiration

50

The double-layered membranous sacs covering the lungs are called?

A

Pericardium

B

Peritoneum

C

Pleura

D

Meninges