Life Processes

Q 1.

Name two inorganic substances which are used by autotrophs to make food.

Q 2.

What are the final products after digestion of carbohydrates and proteins?

Q 3.

What is the name of tiny projections on the inner surface of small intestine which help in absorbing the digested food ?

Q 4.

Describe in brief the function of kidneys, ureters, urinary bladder and urethra.

Q 5.

Name one organism each having saprophytic, parasitic and holozoic modes of nutrition.

Q 6.

In which kind of respiration is more energy released?

Q 7.

What are the living organisms that cannot make their own food called?

Q 8.

Why do fishes die when taken out of water?

Q 9.

What are the adaptations of leaf for photosynthesis?

Q 10.

What will happen if platelets were absent in the blood?

Q 11.

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

Q 12.

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

Q 13.

What substance is mixed with food in the mouth during chewing by the teeth ?

Q 14.

State the three common features of all the respiratory organs like skin, gills and lungs.

Q 15.

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

Q 16.

Why do the walls of the trachea not collapse’when there is less air in it?

Q 17.

Draw a neat diagram of excretory system of human beings and label the following:
(i) Kidney
(ii) Ureter
(iii) Urinary Bladder
(iv) Urethra

Q 18.

(a) Draw a sectional view of the human heart and label on it – Aorta, Right ventricle and Pulmonary veins.
(b) State the functions of the following components of transport system:
(i) Blood (ii) Lymph

Q 19.

Where does digestion of fat take place in our body?

Q 20.

Name an animal whose process of obtaining food is called phagocytosis.

Q 21.

Name a unicellular animal which uses cilia to move food particles into its mouth.

Q 22.

In which part of the digestive system is water absorbed ?

Q 23.

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

Q 24.

What are the functions of liver and pancreas in the human digestive system ?

Q 25.

Match the terms in column I with those in column II :

Q 26.

(a) Define nutrition. Why is nutrition necessary for an organism ?
(b) What are the different modes of nutrition ? Explain with one example of each mode of nutrition.
(c) Name the mode of nutrition in (i) roundworm, and (ii) Plasmodium.

Q 27.

What is the other name of wind-pipe ?

Q 28.

Fill in the following blanks with suitable words :
(a) The organs of respiration in man are the…………..
(b) The actual exchange of gases takes place in the………… of the lungs.
(c) ………………in the lungs provide a very large surface area for gaseous exchange.
(d) Yeast undergoes……….. respiration whereas Amoeba undergoes………….. respiration.
(e) Gills are the breathing organs in…………..

Q 29.

Describe the process of respiration in the following parts of a plant :
(a) Root (b) Stem (c) Leaves

Q 30.

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

Q 31.

Name the two stages in photosynthesis.

Q 32.

Name the parts of the digestive system of a grasshopper.

Q 33.

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

Q 34.

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

Q 35.

Why is small intestine in herbivores longer than in carnivores?

Q 36.

What is the advantage of having four chambered heart?

Q 37.

Explain the process of nutrition in Amoeba.

Q 38.

State the role of the following in human digestive system :
(i) Digestive enzymes (ii) Hydrochloric acid (iii) Villi

Q 39.

Mention the raw materials required for photosynthesis.

Q 40.

List three characteristics of lungs which make it an efficient respiratory surface.

Q 41.

Draw a diagram of human excretory system and label renal artery and urethra.
State in brief the function of :

1. renal artery
2.  kidney
3.  ureter
4. urinary bladder

Q 42.

Name the green dot like structures in some cells observed by a student when a leaf peel was viewed under a microscope. What is this green colour due to?

Q 43.

What is translocation'in plants?

Q 44.

Mention how organisms like bread moulds and mushrooms obtain their food.

Q 45.

All the animals can be divided into three groups on the basis of their eating habits. Name the three groups.

Q 46.

How does Amoeba engulf the food particle ?

Q 47.

From which part of the body, undigested food is egested in Amoeba ?

Q 48.

What is the other name of food pipe ?

Q 49.

Where is digested food absorbed into blood in human body ?

Q 50.

(a) What are autotrophs ? Give one example of autotrophs.
(b) What are the conditions necessary for autotrophic nutrition ?