Kerala SCERT Class 7 Science Chapter 4 Through the Alimentary Canal Question Answer Solution Here. Kerala Board Class 7 Students can find Here 4th Chapter Through the Alimentary Canal Notes provide by our Teacher. Important Question Answer from Chapter 4 Through the Alimentary Canal.
- Board- Kerala Board.
- Class – 7.
- Subject – Science Part 1
- Chapter – 4.
- Chapter Name – Through the Alimentary Canal.
- Topic – Question Answer Solution.
Multiple choice questions.
(1) These are external parasites
a) Louse
b) flea
c) Both
d) None
(2) These are insectivorous plants
a) Venus fly trap
b) Sundew plant
c) Pitcher plant
d) All the above
(3) These are types of teeth
a) Incisors
b) Canine
c) Premolars
d) Molars
e) All the above
(4) The teeth present in human is
a) 30
b) 31
c) 32
d) 33
(5) Digestion of food takes place in
a) Stomach
b) Small intestine
c) Large intestine
d) None
(6) The absorption of water containing minerals and salts takes in
a) Stomach
b) Small intestine
c) Large intestine
d) None
(7) The process of nutrition involves
a) ingestion.
b) Digestion
c) absorption
d) Assimilation
e) excretion
f)All the above.
(8) The first stage in the process of nutrition is
a) ingestion.
b) Digestion
c) absorption
d) Assimilation
(9) The process in which the organic factors present in the food are broken down to simple components that can be absorbed by the body is called
a) ingestion.
b) Digestion
c) absorption
d) Assimilation
(10) The process of the digested food being received into the body is
a) ingestion.
b) Digestion
c) absorption
d) Assimilation
(11) The process in which absorbed components become part of the body is called
a) ingestion.
b) Digestion
c) absorption
d) Assimilation
(12) The byproducts of metabolic reactions which are not useful to the body are eliminated through the process called
a) Digestion
b) absorption
c) Assimilation
d) excretion
(13) Which gas eliminated during respiration?
a) Nitrogen
b) carbon Dioxide
c) Oxygen
d) None.
14) Major excretory organ in the body is
a) Liver
b) kidney
c) stomach
d) None.
Questions and answers.
(1) What are autotrophs?
ANS: Green plants synthesise their own food. Hence they are called autotrophs.
(2) What are Hetrotrophs?
ANS: Organisms which are unable to synthesise their own food and therefore depend on other organisms for food. They are called heterotrophs.
(3) What is tooth decay?
ANS: When food remains stuck to teeth, bacteria feed on them. As a result, lactic acid is produced, which causes the destruction of teeth.
Short question and answers.
1) What are the types of teeth and how many they are?
ANS: THERE are 4 types of teeth.
i) Incisor-i) Eight teeth in the front-four above and four below.
ii) Helps to bite and cut.
ii) Canine- i) Four teeth near the incisors on both sides above and below.
ii) Helps to tear off foodstuff.
iii) Premolar-i) Eight teeth next to canines on both sides above and below.
ii) Helps to chew and grind.
iv) Molar- i) Twelve teeth next to premolars above and below.
ii) Helps to grind and crush.
2) What is working of Small intestine?
ANS: Working is given bellow:
Small intestine is about six metre long. Digestion of food is completed here. The nutrients in the digested food are absorbed into the blood.
(3) What is working of Kidney?
ANS: Working is given bellow:
Kidney is the major excretory organ in the body. Excess urea, water and salts in the blood are filtered and expelled in the form of urine. In order to facilitate this process, we should drink three litre of water daily. Urine contains 96% water.
(4) What is Dehydration?
ANS: The condition of excessive loss of water and salts from the body is called dehydration.
(5) What is work of sweat glands?
ANS: Sweat is produced by sweat glands in the skin. Excess water and salts in the body are eliminated through sweat. Sweating helps to regulate and maintain our body temperature.
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