NCERT Class X Science Solutions: Chapter 6 – Life Processer Part 2

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Question 7:

What are the necessary conditions for autotrophic nutrition and what are its byproducts?

Answer:

Autotrophic nutrition takes place through the process of photosynthesis. Carbon dioxide, water, chlorophyll pigment, and sunlight are the necessary conditions required for autotrophic nutrition. Carbohydrates (food) and are the byproducts of photosynthesis.

Question 8:

What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.

Answer:

Difference between Aerobic respiration and anaerobic respiration:

Aerobic vs Anerobic Respiration
Aerobic vs anerobic respiration

Aerobic respiration

Anaerobic respiration

1.

It occurs in the presence of

1.

It occurs in the absence of

2.

It involves the exchange of gases between the organism and the outside environment.

2.

Exchange of gases is absent.

3.

It occurs in cytoplasm and mitochondria.

3.

It occurs only in cytoplasm.

4.

It always releases and

4.

It produces alcohols and

5.

It yields large amount of energy.

5.

Energy released is very low.

Anaerobic respiration occurs in the roots of some waterlogged plants, some parasitic worms, animal muscles and some micro-organisms such as yeasts.

Question 9:

How are the alveoli designed to maximize the exchange of gases?

Answer:

The alveoli are the small balloon-like structures present in the lungs. The walls of the alveoli consist of extensive network of blood vessels. Each lung contains million alveoli, making it a total of approximately million in both the lungs. The alveolar surface when spread out covers about area. This large surface area makes the gaseous exchange more efficient.

Result for alveoli designed to maximize the exchange of gase …

Alveoli Designed to Maximize the Exchange of Gases

Question 10:

What would be the consequences of a deficiency of haemoglobin in our bodies?

Answer:

Haemoglobin is the respiratory pigment that transports oxygen to the body cells for cellular respiration. Therefore, deficiency of haemoglobin in blood can affect the oxygen supplying capacity of blood. This can lead to deficiency of oxygen in the body cells. It can also lead to a disease called anemia.

This figure shows Iron deficiency - Anemia

Iron Definciency - Anemia

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