Solution of Chapter 6. Life Process (NCERT - Science Exemplar Book)

Which of the following statements about the autotrophs is incorrect?

In which of the following groups of organisms, food material is broken down outside the body and absorbed?

Select the correct statement

Which is the correct sequence of parts in human alimentary canal?

If salivary amylase is lacking in the saliva, which of the following events in the mouth

cavity will be affected?

The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one

Which part of alimentary canal receives bile from the liver?

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

In which part of the alimentary canal food is finally digested?

Choose the function of the pancreatic juice from the following

When air is blown from mouth into a test-tube containing lime water, the lime water

turned milky due to the presence of

Which of the following is most appropriate for aerobic respiration?

Which of the following statement(s) is (are) true about respiration?

1. During inhalation, ribs move inward and diaphragm is raised

2. In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into

blood and carbon dioxide from blood into alveolar air

3. Haemoglobin has greater affinity for carbon dioxide than oxygen

4. Alveoli increase surface area for exchange of gases

Which is the correct sequence of air passage during inhalation?

During respiration exchange of gases take place in

Which of the following statement (s) is (are) true about heart?

1. Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs

2. Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs

3. Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts

4. Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body.

What prevents backflow of blood inside the heart during contraction?

Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by

In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?

Choose the correct statement that describes arteries.

The filtration units of kidneys are called

Oxygen liberated during photosynthesis comes from

The blood leaving the tissues becomes richer in

Which of the following is an incorrect statement?

The internal (cellular) energy reserve in autotrophs is

Which of the following equations is the summary of photosynthesis?

Choose the event that does not occur in photosynthesis

The opening and closing of the stomatal pore depends upon

Choose the forms in which most plants absorb nitrogen

1. Proteins

2. Nitrates and Nitrites

3. Urea

4. Atmospheric nitrogen

Which is the first enzyme to mix with food in the digestive tract?

Which of the following statement(s) is (are) correct?

1. Pyruvate can be converted into ethanol and carbon dioxide by yeast

2. Fermentation takes place in aerobic bacteria

3. Fermentation takes place in mitochondria

4. Fermentation is a form of anaerobic respiration

Lack of oxygen in muscles often leads to cramps among cricketers. This results due to

Choose the correct path of urine in our body

During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the

Name the following:

(1) The process in plants that links light energy with chemical energy
(2) Organisms that can prepare their own food

(3) The cell organelle where photosynthesis occurs

(4) Cells that surround a stomatal pore

(5) Organisms that cannot prepare their own food

(6) An enzyme secreted from gastric glands in stomach that acts on proteins.

“All plants give out oxygen during day and carbon dioxide during night”. Do you agree with this statement? Give reason.

How do the guard cells regulate opening and closing of stomatal pores?

Two green plants are kept separately in oxygen free containers, one in the dark and the other in continuous light. Which one will live longer? Give reasons.

If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your Solution.

Why do fishes die when taken out of water?

Differentiate between an autotroph and a heterotroph.

Is ‘nutrition’ a necessity for an organism? Discuss.

What would happen if green plants disappear from earth?

Leaves of a healthy potted plant were coated with Vaseline. Will this plant remain healthy for long? Give reasons for your Solution.

How does aerobic respiration differ from anaerobic respiration?

Match the words of column A with that of column B

Differentiate between an artery and a vein.

What are the adaptations of leaf for photosynthesis?

Why is small intestine in herbivores longer than in carnivores?

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

What is the significance of emulsification of fats?

Why does absorption of digested food occur mainly in the small intestine?

Match Group (A) with Group (B)

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

Why is blood circulation in human heart called double circulation?

What is the advantage of having four chambered heart?

Mention the major events during photosynthesis.

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

(i) Cloudy days

(ii) No rainfall in the area

(iii) Good manuring in the area

(iv) Stomata get blocked due to dust

(v) What causes movement of food inside the alimentary canal?

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

What is common for cuscuta, ticks and leeches?

Explain the role of mouth in digestion of food.

Why do veins have thin walls as compared to arteries?

What are the functions of gastric glands present in the wall of the stomach?

Match the terms in Column (A) with those in Column (B)

Name the correct substrates for the following enzymes:

(a) Trypsin (b) Amylase (c) Pepsin (d) Lipase

What will happen if platelets were absent in the blood?

Plants have low energy needs as compared to animals. Explain.

Why and how does water enter continuously into the root xylem?

Why is transpiration important for plants?

How do leaves of plants help in excretion?

Explain the process of nutrition in Amoeba.

Describe the alimentary canal of man.

Explain the process of breathing in man.

Explain the importance of soil for plant growth.

How do carbohydrates, proteins and fats get digested in human beings?

Explain the mechanism of photosynthesis.

Explain the three pathways of breakdown in living organisms.

Describe the flow of blood through the heart of human beings.

Describe the process of urine formation in kidneys.