Chapter 2 – Nutrition in Animals
Assignment 1
Q.1. State whether True or False.
(i) Enamel is the hardest part of a tooth.
(ii) Villi are projections found in the small intestines.
(iii) The walls of the stomach produce hydrochloric acid.
(iv) Saliva helps to digest starch.
(v) Bile breaks down sugar.
(vi) Amoeba does not have a specialised organ for procuring food.
(vii) Digestion involves breaking down food into small insoluble pieces.
(viii) Saliva makes the food wet so that it is easy to chew and swallow. lt does not have any other action on food.
(ix) Digestion of food mainly occurs in the stomach.
(x) Teeth are the feeding structures in all animals.
Q.2. Fill in the Blanks:
(i) Humans are _______, so they have all the basic types of teeth.
(ii) In humans, the _______ bite and cut the food.
(iii) The teeth are coated with ________ which is the hardest substance in the body.
(iv) Animals like cow and sheep that chew the cud are called ________ .
(v) The salivary glands, pancreas and the liver are the _______ _______ that secrete digestive juices.
(vi) Gentle movements of the stomach wall churn the food with digestive juices and change it into a semi-solid state called ________ .
(vii) The greater part of digestion takes place in the _______ .
(viii) Much of our food is in an _______ form. For the body to use it, these substances must be converted into ______ form.
Q.3. What is the function of saliva?
Q.4. What changes occur in the following during digestion?
(i) Starch (ii) Fats (iii) Proteins
Q.5. What is 'peristalsis'?
Q.6. What is chyme?
Q.7. What does the word ingestion mean?
Q.8. What is assimilation?
Q.9. How is food prevented from going into the lungs while swallowing?
Q.10. Name any four digestive enzymes and state where each is produced.
Q.11. What are pseudopodia?
Q.12. What is meant by 'cud'?
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