Class 7 Science - Chapter Nutrition in Animals NCERT Solutions | Mark ëTí if the statement is
Mark ëTí if the statement is true and ëFí if it is false:
(a) Digestion of starch starts in the stomach. (T/F)
(b) The tongue helps in mixing food with saliva. (T/F)
(c) The gall bladder temporarily stores bile. (T/F)
(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)
a) False
Carbohydrate digestion begins in the buccal cavity with the mechanical action of chewing and this contains several enzymes salivary analyse and lysozyme. Then digestion of carbohydrates continues in the stomach then in the small intestine which contains pancreatic (helps in starch hydrolization) and intestinal juice.
b) True
Enzymes in the saliva begins to digest complex food materials that is partly digested by salivary amylase. With the help of the tongue, the bolus is moved into the oesophagus by swallowing the food’ smaller pieces. Saliva contains mucus that moistens the food and also cleans the tongue. It also contains immunoglobulins and lysozymes that contains antibacterial action.
c) True
The gall bladder stores and secretes the bile juice in the duodenum and is stored in it until the food material reaches the stomach. Gall bladder contains natural mechanism to contract at the same time when the food material reaches the stomach.
d) True
The ruminants brings back swallowed grass to their mouth and chew this for some time. Grass contains cellulose and is a carbohydrate which can only be digested by ruminants because they have rumen. When they eat grass, it sent to the rumen where enzymes are present that acts on it and moisten it. Then it is sent back to the mouth from where ruminants chew it for sometimes.
More Questions From Class 7 Science - Chapter Nutrition in Animals
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Write one similarity and one difference between the nutrition in amoeba and human beings.
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Label Fig. 2.11 of the digestive system.
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Can we survive only on raw, leafy vegetables/grass? Discuss.
- Q:-
Which part of the digestive canal is involved in:
(i) absorption of food ________________.
(ii) chewing of food ________________.
(iii) killing of bacteria ________________.
(iv) complete digestion of food ________________.
(v) formation of faeces ________________. - Q:-
Match the items of Column I with suitable items in Column II
Column I Column II
(a) Salivary gland (i) Bile juice secretion
(b) Stomach (ii) Storage of undigested food
(c) Liver (iii) Saliva secretion
(d) Rectum (iv) Acid release
(e) Small intestine (v) Digestion is completed
(f ) Large intestine (vi) Absorption of water
(vii) Release of faeces - Q:-
Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.
- Q:-
Match the items of Column I with those given in Column II:
Column I Column II
Food components Product(s) of digestion
Carbohydrates Fatty acids and glycerol
Proteins Sugar
Fats Amino acids - Q:-
Why do we get instant energy from glucose?
- Q:-
Tick (✓) mark the correct answer in each of the following:
(a) Fat is completely digested in the
(i) stomach (ii) mouth (iii) small intestine (iv) large intestine(b) Water from the undigested food is absorbed mainly in the
(i) stomach (ii) foodpipe (iii) small intestine (iv) large intestine - Q:-
What are villi? What is their location and function?
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Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
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(c) Burning of coal
(d) Melting of wax
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(f ) Digestion of food - Q:-
Name the elements that determine the weather of a place.
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Fill the missing word in the blank spaces in the following statements:
(a) Wind is——————air.
(b) Winds are generated due to —————— heating on the earth.
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(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants - Q:-
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Match structures given in Column I with functions given in Column II.
Column I Column II
(i) Stomata (a) Absorption of water
(ii) Xylem (b) Transpiration
(iii) Root hairs (c) Transport of food
(iv) Phloem (d) Transport of water
(e) Synthesis of carbohydrates - Q:-
Fill in the blanks:
(a) Production of new individuals from the vegetative part of parent is called_____________.
(b) A flower may have either male or female reproductive parts. Such a flower is called_____________.
(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____________.
(d) The fusion of male and female gametes is termed as _____________.
(e) Seed dispersal takes place by means of _____________, _____________ and _____________. - Q:-
Classify the following as motion along a straight line, circular or oscillatory motion:
(i) Motion of your hands while running.
(ii) Motion of a horse pulling a cart on a straight road.
(iii) Motion of a child in a merry-go-round.
(iv) Motion of a child on a see-saw.
(v) Motion of the hammer of an electric bell.
(vi) Motion of a train on a straight bridge.
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Fig. 13.15 Distance-time graph for the motion of two cars
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(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F)
(b) Water shortage is a problem faced only by people living in rural areas. (T/F)
(c) Water from rivers is the only source for irrigation in the fields. (T/F)
(d) Rain is the ultimate source of water. (T/F) - Q:-
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(a) An image that cannot be obtained on a screen is called ____________.
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(d) An image which can be obtained on a screen is called a _________ image.
(e) An image formed by a concave ___________ cannot be obtained on a screen. - Q:-
Why do organisms need to take food?
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