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Saturday, 9 April 2016


                              LIFE PROCESSES

(1) Due to availability of less water, how does the plant cope up with lack of water in desert conditions?

(2) After a vigorous exercise, you may experience cramps in your leg muscles. Why does this happen?

(3) What will happen if carbon monoxide combines with haemoglobin?

(4) Food moves down the gut by peristalsis. Which region of brain controls 

(5) Name the pigment present in plants, which can absorb solar energy.

(6) Name the respiratory organs of (i) fish (ii) mosquito (iii) earthworm.

(7) Which of the four chambers of the human heart has the thickest muscular walls?

(8) What will be the outcome if a farmer floods his field everyday?

(9) Which part of visible spectrum is absorbed by chlorophyll pigments?

(10) How does respiration in plants differ from that in animals?

(11) Name the cartilaginous flap which closes the glottis to check the entry of food into it during swallowing.

(12) Which equipment is used to facilitate breathing during serious breathing problems?

(13) Chloroplast are called energy converters. Explain.

(14) Why is the rate if breathing much faster in aquatic organisms than those of terrestrial organisms?

(15) Why are glomeruli considered as dialysis bags?

(16) Autotrophs synthesise food for the living world. Justify this statement in one sentence only interconnecting autotrophs and heterotrophs.

(17)Veins and arteries carry blood. Which of these carry blood?
a) Away from the heart?
b) Back to the heart?

(18) Which of the organs perform the following functions in humans?
1. Absorption of food.
2. Absorption of water

(19) Name the areas in a woody stem through which respiratory exchange of gases 
take place.

(20) Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets?

(21) A certain tissue in a green plant somehow get blocked and the leaves 
wilted.What was the tissue that got blocked?

(22) Write one feature which is common to each of the following pairs of the term/organs.
i) glycogen and starch ii) chlorophyll and haemoglobin
iii) gills and lungs iv) arteries and veins.

(23) Why doesn’t the lungs collapse even after forceful expiration?

(24) The two openings of the pharynx, one leading to trachea and the other leading to oesophagus, lie very close to each other. Yet food we swallow normally does not enter into our trachea. Why?

(25) How would it affect the digestion of proteins and carbohydrates if the
duodenum of man if there is a blockade in the pancreatic duct?

(26) What do you mean by double circulation of blood?

(27) “If there were no algae there would be no fish in the sea”. Comment.

(28)Write the functions of the following in the digestive process:
(i) Bile
(ii) Bicarbonate secreted by the duodenal wall.
(iii) Pancreatic amylase.

(29) Why is the process of diffusion insufficient to meet the oxygen requirement
of human beings?

(30) Draw a diagram of human alimentary canal showing duodenum, small
intestine, liver and pancreas.

(31) Draw a diagram of the human urinary system and label in it.
a. Kidney
b. Ureter
c. Urinary Bladder
d. Urethra

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