biology - life processes

Class 10 - Biology

Life Processes

Q&A
Question:

Which is the basic requirement of living organisms for obtaining energy ?

Answer:

Food is the basic requirement of living organisms for obtaining energy.



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Questions and Answers


Life Processes - Questions
1.

Which substance is used to remove chlorophyll from a green leaf during photosynthesis experiments ?


Answer
2.

What is the name of those cells in the leaf of a plant which control the opening and closing of stomata?


Answer
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.


Answer
4.

(a) Name the main organs of the human digestive system. Also name the associated glands.
(b) How do carbohydrates, fats and proteins get digested in human beings ?


Answer
5.

Name the red pigment which carries oxygen in blood.


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6.

Explain why, a land plant may die if its roots remain water logged for a long time.


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7.

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


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8.

What is the mode of nutrition in fungi?


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9.

How does amoeba engulf its food?


Answer
10.

In which kind of respiration is more energy released?


Answer
11.

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


Answer
12.

Where does digestion begin?


Answer
13.

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


Answer
14.

What will happen if platelets were absent in the blood?


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15.

Draw a diagram of human excretory system and label kidneys, ureters on it.


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16.

(a)Explain how does the exchange of gases occur in plants across the surface of stems, roots and leaves.
(b) How are water and minerals transported in plants ?


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17.

Write correct sequence of four steps of method for the preparation of temporary mount of a stained leaf peel.


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18.

(a) Name the site of exchange of material between the blood and surrounding cells. (b) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide in human body.


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19.

State two differences between arteries and veins.


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20.

Name the process in plants where water is lost as water vapour. :


Answer
21.

Where is chlorophyll mainly present in a plant ?


Answer
22.

Which of the organs perform the following functions in humans ?
(i) Absorption of food
(ii) Absorption of water


Answer
23.

Fill in the following blanks with suitable words :
(a) All green plants are…………..
(b) All non-green plants and animals are…………
(c) Heterotrophs depend on…….. and other……………… for food,
(d) Green plants use……… ,………… and………… to make food.
(e) Iodine turns blue-black on reacting with………………


Answer
24.

(a) What are heterotrophs ? Give one example of heterotrophs.
(b) What is the difference between autotrophic nutrition and heterotrophic nutrition ?


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25.

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


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26.

Define (i) saprophytic nutrition (ii) parasitic nutrition, and (iii) holozoic nutrition. Give one example of each type.


Answer
27.

What substances are contained in gastric juice ? What are their functions ?


Answer
28.

What substances are contained in pancreatic juice ? What are their functions ?


Answer
29.

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


Answer
30.

(a) What would happen if all the green plants disappear from the earth ?
(b) 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 answer.


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31.

Name one organism which can live without oxygen.


Answer
32.

Out of photosynthesis and respiration in plants, which process occurs :
(a) all the time ?
(b) only at daytime ?


Answer
33.

Name the organs of breathing in fish.


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34.

In the lungs :
(a) what substance is taken into the body ?
(b) what substance is removed from the body ?


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35.

Define breathing. State the differences between breathing and respiration.


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36.

(a) What is meant by aquatic animals and terrestrial animals ?
(b) From where do the aquatic animals and terrestrial animals obtain oxygen for breathing and respiration ?


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37.

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


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38.

Name the two stages in photosynthesis.


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39.

Name the factors, which affect photosynthesis.


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40.

Give two points of differences between respiration in plants and respiration in animals.


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41.

State the function of epiglottis.


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42.

What are chemotrophs?


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43.

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


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44.

How are fats digested in our bodies? Where does this process take place?


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45.

Why do fishes die when taken out of water?


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46.

What would happen if green plants disappear from earth?


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47.

Explain the role of mouth in digestion of food.


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48.

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


Answer
49.

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


Answer
50.

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


Answer