Biology

Life Processes

Question:

Name the green pigment present in the leaves of a plant.

Answer:

Chlorophyll.

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Life Processes

Q 1.

What is the advantage of having four chambered heart?

Q 2.

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

Q 3.

(a) How do guard cells regulate opening and closing of stomatal pores ?
(b) Two similar green plants are kept separately in oxygen free containers, one in dark and the other in continuous light. Which one will live longer ? Give reasons.

Q 4.

Where does the blood absorb oxygen in the human body ?

Q 5.

What is the other name of wind-pipe ?

Q 6.

Define breathing. State the differences between breathing and respiration.

Q 7.

What are the different ways in which glucose is oxidised to provide energy in various organisms ? Give one example of each.

Q 8.

Explain why, it is dangerous to inhale air containing carbon monoxide.

Q 9.

Which part of the roots is involved in exchange of respiratory gases?

Q 10.

State the function of epiglottis.

Q 11.

Other than chlorophyll, which other pigment is necessary for photosynthesis?

Q 12.

What is the significance of emulsification of fats?

Q 13.

Name the correct substrates for the following enzymes
(a) Trypsin (b) Amylase (c) Pepsin (d) Lipase

Q 14.

What is saliva? State its role in the digestion of food.

Q 15.

What will happen to a plant if its xylem is removed?

Q 16.

What is the mode of nutrition in human beings?

Q 17.

In addition to carbon dioxide and water, state two other conditions necessary for the process of photosynthesis to take place.

Q 18.

The leaves of a plant first prepare food A by photosynthesis. Food A then gets converted into food What are A and B ?

Q 19.

Why do we boil the leaf in alcohol when we are testing it for starch ?

Q 20.

Name the organelle of plant cells in which photosynthesis occurs.

Q 21.

Name the green pigment present in the leaves of a plant.

Q 22.

What substances enter into the food vacuole in Amoeba to break down the food ?

Q 23.

Name the enzyme present in human saliva. What type of food material is digested by this enzyme ?

Q 24.

What is the name of the opening in the human body through which undigested food is thrown out ?

Q 25.

Name the biological catalysts which bring about chemical digestion of food.

Q 26.

a) How do plants obtain food ?
(b) Why do plants need nitrogen ? How do plants obtain nitrogen ?

Q 27.

(a) How does carbon dioxide from the air enter the leaves of a plant to be used in photosynthesis ?
(b) How does water from the soil reach the leaves of a plant to be used in photosynthesis ?

Q 28.

Match the organisms given in column I with the processes given in column II :
Lakhmir Singh Biology Class 10 Solutions Life Processes-7

Q 29.

(a) What is common for Cuscuta, ticks and leeches ?
(b) Name the substances on which the following enzymes act in the human digestive system :
(i) Trypsin (ii) Amylase (iii) Pepsin (iv) Lipase
(c) Why does absorption of digested food occur mainly in the small intestine ?

Q 30.

Name one substance which is produced in anaerobic respiration by an organism but not in aerobic respiration.

Q 31.

Name the organs of breathing in fish.

Q 32.

The trachea divides into two tubes at its lower end. What is the name of these tubes ?

Q 33.

Name the red pigment which carries oxygen in blood.

Q 34.

Where in the lungs does gas exchange take place ?

Q 35.

What is the name of tiny air-sacs at the end of smallest bronchioles in the lungs ?

Q 36.

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

Q 37.

What type of respiration takes place in human muscles during vigorous physical exercise ? Give reason for your answer.

Q 38.

Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.

Q 39.

Describe the process of respiration in fish.

Q 40.

Name the energy currency in the living organisms. When and where is it produced ?

Q 41.

(a) Explain how, the air we breathe in gets cleaned while passing through the nasal passage.
(b) Why do the walls of trachea not collapse when there is less air in it ?
(c) How are oxygen and carbon dioxide exchanged in our body during respiration ?
(d) How are lungs designed in human beings to maximise the exchange of gases ?

Q 42.

What is the mode of nutrition in fungi?

Q 43.

Define a herbivore and a carnivore.

Q 44.

From where do the following take in oxygen?
(i) prawn (ii) rat.
Solution:

Q 45.

What is compensation point?

Q 46.

What happens to visible light of the Sun when it falls on chlorophyll?

Q 47.

Why do fishes die when taken out of water?

Q 48.

What are the adaptations of leaf for photosynthesis?

Q 49.

What will happen if mucus is not secreted by the gastric glands?

Q 50.

What are enzymes? Name any one enzyme of our digestive system and write its function.