NCERT Class X Science Class: Chapter –6. Life Processer – Part-10

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Question 55:

Match Group (A) with Group (B)

Match Group (A) with Group (B) (Q)
Match Group (A) with Group (B) (Q)

Column A

Column B

A

Autotrophic nutrition

i

Leech

B

Heterotrophic nutrition

ii

Paramecium

C

Parasitic nutrition

iii

Deer

D

Digestion in food vacuoles

iv

Green plant

Answer:

Match Group (A) with Group (B) (A)
Match Group (A) with Group (B) (A)

Column A

Column B

A

Autotrophic nutrition

iv

Green plant

B

Heterotrophic nutrition

iii

Deer

C

Parasitic nutrition

i

Leech

D

Digestion in food vacuoles

ii

Paramecium

Question 56:

Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

Answer:

Aquatic organisms like fishes obtain oxygen from water present in dissolved state through their gills. Since the amount of dissolved oxygen is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms.

Question 57:

Why is blood circulation in human heart called double circulation?

Answer:

The blood circulation in human heart is called double circulation because the blood passes through the heart twice in one complete cycle of the body – once through the right half in the form of deoxygenated blood and once through the left half in the form of oxygenated blood.

Image blood circulation in human heart

Image Blood Circulation in Human Heart

Image blood circulation in human heart

Question 58:

What is the advantage of having four chambered heart?

Answer:

In four chambered heart, left half is completely separated from right half by septa. This prevents oxygenated and deoxygenated blood from mixing. This allows a highly efficient supply of oxygenated blood to all parts of the body. This is useful in animals that have high energy needs, such as birds and mammals.

Question 59:

Mention the major events during photosynthesis

Answer:

The major events during photosynthesis are

(a) Absorption of light energy by chlorophyll

(b) Conversion of light energy to chemical energy

(c) Splitting of into

(d) Reduction of to carbohydrates

Question 60:

In each of the following situations what happens to the rate of photosynthesis?

(a) Cloudy days

(b) No rainfall in the area

(c) Good manuring in the area

(d) Stomata get blocked due to dust

Answer:

(a) Cloudy days - Decreases

(b) No rainfall in the area - Decreases

(c) Good manuring in the area - Increases

(d) Stomata get blocked due to dust - Decreases