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Choose the odd one out from each group and give reasons. (i) liver, salivary gland, starch, gall bladder (ii) stomach, liver, pancreas, salivary gland (iii) tongue, absorption, taste, swallow (iv) oesophagus, small intestine, large intestine, rectum

(i) Starch : liver, salivary gland and gall bladder are all parts of the alimentary canal. They either produce an enzyme or store it. It... View Article

Mark the following statements as True or False. If false, write the correct statements. (a) Tongue is attached to the roof of the mouth cavity at the back. (b) The large intestine is longer and wider than the small intestine of the human alimentary canal. (c) Mucus protects the stomach lining from damage. (d) All heterotrophs have a similar basic process of nutrition.

(a) True. Our tongue is attached to the roof of the mouth cavity at the back and the front is free moving. (b) False. The large intestine is... View Article

Name the parts of the alimentary canal where (i) water gets absorbed from undigested food. (ii) digested food gets absorbed. (iii) taste of the food is perceived. (iv) bile juice is produced.

Name the parts of the alimentary canal where (i) The part of alimentary canal where water gets absorbed from the undigested food is the large... View Article

Cellulose-rich food substances are a good source of roughage in human beings because (a) human beings do not have cellulose-digesting enzymes. (b) cellulose gets absorbed in the human blood and converts into fibres. (c) the cellulose-digesting bacteria convert cellulose into fibres. (d) cellulose breaks down into smaller components which are egested as roughage.

a)Human beings do not have cellulose-digesting enzymes Cellulose-rich food substances are a good source of roughage for human beings because... View Article

Choose the correct order of terms that describes the process of nutrition in ruminants. (a) swallowing → partial digestion → chewing of cud → complete digestion (b) chewing of cud → swallowing → partial digestion → complete digestion (c) chewing of cud → swallowing → mixing with digestive juices → digestion (d) swallowing → chewing and mixing → partial digestion → complete digestion

a) Swallowing → Partial digestion → Chewing of cud → Complete digestion The digestion process in Ruminants begins by chewing and... View Article

Cud is the name given to the food of ruminants which is (a) swallowed and undigested. (b) swallowed and partially digested. (c) properly chewed and partially digested. (d) properly chewed and completely digested.

b) Swallowed and partially digested. Cud is the partially digested food in the rumen of ruminants like cow. Ruminants quickly swallow the grass... View Article

The enzymes present in the saliva convert (a) fats into fatty acids and glycerol. (b) starch into simple sugars. (c) proteins into amino acids. (d) complex sugars into simple sugars.

b) Starch into simple sugars. The saliva contains amylase enzyme that breaks down starch into simple sugar. Salivary enzyme could be a... View Article

The false feet of Amoeba is used for (a) movement only. (b) the capture of food only. (c) the capture of food and movement. (d) exchange of gases only.

c) Capture of food and movement Option A: Amoeba uses pseudopodia for ingestion also. Therefore, this is the incorrect option. Option B:... View Article

Read the following statements with reference to the villi of the small intestine. (i) They have very thin walls. (ii) They have a network of thin and small blood vessels close to the surface. (iii) They have small pores through which food can easily pass. (iv) They are finger-like projections. Identify those statements which enable the villi to absorb digested food. (a) (i), (ii) and (iv) (b) (ii), (iii) and (iv) (c) (iii) and (iv) (d) (i) and (iv)

a) (i), (ii) and (iv) Inner walls of the small intestine have thousands of finger-like outgrowths called villi (singular villus). Villi... View Article

The finger-like outgrowths of Amoeba help to ingest food. However, the finger-like outgrowths of human intestine help to (a) digest the fatty food substances. (b) make the food soluble. (c) absorb the digested food. (d) absorb undigested food.

(c) absorb the digested food. Vili are finger-like outgrowths of the human intestine. The main role of villi is to amplify surface area for the... View Article

The acid present in the stomach (a) kills the harmful bacteria that may enter along with the food. (b) protects the stomach lining from harmful substances. (c) digests starch into simpler sugars. (d) makes the medium alkaline.

a) Kills the harmful bacteria that may enter along with the food The acid present in the stomach is the Hydrochloric acid which is secreted by... View Article

The swallowed food moves downwards in the alimentary canal because of (a) force provided by the muscular tongue. (b) the flow of water taken with the food. (c) gravitational pull. (d) the contraction of muscles in the wall of the food pipe.

d) The contraction of muscles in the wall of food pipe. When food goes into the food pipe, the muscles in its walls start to alternate... View Article

Read carefully the terms given below. Which of the following set is the correct combination of organs that do not carry out any digestive functions? (a) Oesophagus, Large Intestine, Rectum (b) Buccal cavity, Oesophagus, Rectum (c) Buccal cavity, Oesophagus, Large Intestine (d) Small Intestine, Large Intestine, Rectum

Answer is (a) Oesophagus, Large Intestine, Rectum Explanation: Oesophagus pushes the food downwards and it is not involved in any digestive... View Article

Which of the following pair of teeth differ in structure but are similar in function? (a) canines and incisors. (b) molars and premolars. (c) incisors and molars. (d) premolars and canines.

b) Molars and premolars The molars are the largest teeth of all. The premolars present next to molars. Molars are 12 in number, whereas... View Article

Given below from (i) to (iv) are some food items. i) Boiled and mashed potato ii) Glucose solution iii) A slice of bread iv) Mustard oil Which of the above will give blue-black colour when tested with iodine? (a) (i) and (ii) (b) (i) and (iii) (c) (ii) and (iii) (d) (iii) and (iv)

b) (i) and (iii) If starch is mixed with iodine, it gives a blue-black colour. The boiled and mashed potato and a 'slice of bread' contain... View Article

Can you give me a name? Solve each of the following riddles by writing the name of the organism and its mode of nutrition. One riddle is solved to help you. (a) I am tall but I cannot move. I am green and can prepare my own food. tree, autotroph (b) I live in water; people keep me in an aquarium and feed me. , (c) I am small and I can fly. I disturb your sleep, bite you and suck your blood which is my food. , (d) I am white and soft. I grow well in the rainy season. Children pluck me from the ground and admire me. I absorb nutrients from decomposed dead parts of plants and animals in the soil. ,.

(b) fish, heterotroph A heterotroph is an organism that is unable to synthesize its own food, and therefore, has to rely on other sources,... View Article

Spot as many organisms as possible in the puzzle given as Figure by encircling them as shown. Write the names on a sheet of paper and categorise them into autotrophs and heterotrophs. Classify the heterotrophs into herbivores, carnivores, omnivores and saprophytes.

First row: Crow ( Heterotroph, Carnivore ) Second Row: Bhindi ( Autotroph) Third row: ginger ( Autotroph) Fourth row: Cow ( heterotroph,... View Article

Wild animals like tiger, wolf, lion and leopard do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation?

Wild animals like tiger, wolf, lion, and leopard do not eat plants. Wild animals hunt and eat herbivorous animals such as zebra, goat, deer,... View Article

Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials. (a) Available in the plant : _______ (b) Available in the soil : _, _ (c) Available in the air : _ (d) Available during day : _________

The appropriate raw materials are: (a) Available in the plant : chlorophyll (b) Available in the soil : water and minerals. (c) Available in the... View Article

Wheat dough is left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

Wheat dough if left unwrapped for few days, the reproduction of yeast and formation of fungus takes space. Carbohydrates in wheat dough encourage... View Article

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