NCERT Class 10 Physics Assignments for Life Processes (Respiration) Board Sample Problems Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Assignments for Life Processes (Respiration)

Question 1

Why do organisms need food?


Organisms need food for obtaining energy to perform the vital functions.

Question 2

What is a respiratory substrate?


The substance used by the cell to derive energy is called a respiratory substrate

Question 3

How does food yield energy?


Food is broken energy in the form of ATP.

Question 5

Name a few respiratory substrates. Which of them is most commonly used?


Carbohydrates, fats, proteins are some of the respiratory substrate. The most commonly used of them is glucose, a carbohydrate.

Question 6

Give the general equation for respiration?


Question 7

What are the stages of respiration?


Respiration takes place in the following stages:

External respiration or gaseous exchange: The exchange of gases between the environment and the body is called external respiration or gaseous exchange.

Internal respiration: The bio-chemical processes involved in respiration which break down the substrate to release energy take place in the tissues within the cells of an organism. Thus, this is also called the cellular or tissue respiration.

Question 8

What is the respiratory surface?


The area where the gaseous exchange takes place is called the respiratory surface.

Question 9

What are the characteristics of an ideal respiratory surface?


The respiration surface should have the following characteristics:

It should be permeable to the gases.

It should be thin (1mm or less) to allow effective diffusion.

It should be richly supplied with blood vessels or bodily fluids to allow maximum uptake of oxygen in minimum time.

Question 10

How does gaseous exchange take place in the lower plants?


In lower plants exchange of gases takes place through the general body surface as they are not highly modified or specialized.

Question 11

Which part of a plant is involved in the gaseous exchange?


The entire plant is involved in gaseous exchange- leaves (stomata) , stem (lenticels) and general surface of the roots.

Question 12: How does gaseous exchange take place in the leaves?


The leaves have openings called the stomata which are generally on the lower surface of the leaves. It is through the stomata that the gases and water vapour diffuse in and out easily. The oxygen diffuses in through the stomata and then enters the leaf cells.

Similarly, the carbon dioxide produced by the leaf cells diffuses out through the stomata.

Question 13

What are lenticels?


In woody stems, the entire surface is covered by dark which is impervious to s gases or water.

However, there are certain openings or pores in the layer of bark. These are called the lenticels.

They are visible more raised then the general surface of the stem. At the base of the lenticels are loosely arranged cells which allow the diffused gases to pass in and out.

Question 14

What are pneumatophores?


Plants which grow in salty water show specialized roots called the on. These are roots growing out of the surface of water with numerous pores on their surface.

Question 15

How does exchange of gases take place in fish?


Fish have specialized organs called the gills for exchange of gases.

Question 16

From where do the fish obtain their oxygen supply?


Fish utilize the oxygen dissolved in the water in which they live.

Question 17

What is operculum?


It is a plate- like cover made up of muscles and bony layer present on the outer side of the gills.

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