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(a) What is common for Cuscuta, ticks an...

(a) What is common for Cuscuta, ticks and leeches ?
(b) Name the substances on which the following enzymes act in the human digestive system:
9i) Trypsin (ii) Amylase (iii) Pepsin (iv) Lipase
(c) Why does absorption of digested food occur mainly in the small intestine ?

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The correct Answer is:
(a) Parastic mode of nutrition (b) (i) Proteins (ii) Starch (iii) Proteins (iv) Fats (c) Due to the presence of a large number of villi
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(a) what is puberty? (b) describe in brief the functions of the following parts in the human male reproductive system: (i) Testes (ii) Seminal vesicle (iii) Vas deferens (iv) Urethra (c) Why are testes located outside the abdominal cavity? (d) State how sperms move towards the female germ cell.

(a) Draw a labelled diagram of the human digestive system. With the help of this diagram, describe the process of digestion of food in man (humans). (b) Describe one way in which the small intestine is adapted for the absorption of digested food. (c) What is the special name of the contraction and expansion movement which pushes the food further in our digestive tract (or alimentary canal) ?

When a person puts food in his mouth, then teeth cut it into small pieces, shew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enters the stomach with food. The substance G protects the inside layer fo stomach from the damaging effect of substance F whereas substance H is an enzyme for digestion. The partially digested food then enters into small intestine for further digestion. (a) What is (i) gland A (ii) substance B, and (iii) enzyme C ? (b) Name the tube D. (c) What is the movement E known as ? (d) What are (i) F (ii) G, and (iii) D ?

The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume. (a) Name the substances (i) X (ii) Y and (iii) Z. (b) What is the process of conversion of X into Y known as ? (c ) At which temperature X gets converted into Y ? (d) What is the process of conversion of X into Z known as ? (e) At which temperature X gets converted into Z ?

The following statements are based on the digestion and absorption of food. Select the correct and incorrect statements and choose an option accordingly from the codes given below. I. Active absorption of monosaccharides in the stomach and jejunum is carried out by facilitated transport. II. Most of the amino acids (above 95%) are absorbed in the duodenum and jejunum parts of the small intestine. III. Food is digested completely before absorption and is used by the body tissues. IV. Absorption of water from the small intestine is concerned with the absorption of salts and digested food in order to maintain an osmotic balance with the blood.

(a) Draw a diagram of human alimentary canal and label the following parts: (i) largest gland. (ii) gland that secretes digestive enzymes and hormone. (iii) Part where HCl is produced. (iv) part where digested food is absorbed. (b) What are villi? Explain their function in the digestive system.

Anser simply as, a,b,c or d (i) Sucrase in an enzyme found in (a) Saliva (b) Gastric juic (c ) Intertinal juice (d) Panceatic juice (ii) Most digestion occurs in (a) Mouth (b) stomach (c ) small intestine (d) Large intestine (iii) What is the substrate of salivary amylase? (a) Protein (b) starch (c) Glucose (d) maltose (iv) The funcitons of bile are listed below. Pick out the false statement (a) Bie neutralses the acidic of food (b) It provides an alkaline medium for the interstinal proteases (c ) It contains a lipase (d) Its salt emulsify fats.

LAKHMIR SINGH & MANJIT KAUR-LIFE PROCESSES-Exercise
  1. Name the following: (a) The process in plants which converts light e...

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  2. Match the terms in column I with those in column II: {:(,"Column I",...

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  3. (a) What is common for Cuscuta, ticks and leeches ? (b) Name the sub...

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  4. (a) Why is small intestine in herbivores longer than in carnivores ? ...

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  5. (a) What a photosynthesis ? (b) Write a chemical equation to show th...

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  6. (a) Describe the process of nutrition in Amoeba. Draw labelled diagram...

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  7. (a) Draw a labelled diagram of the human digestive system. With the he...

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  8. (a) Describe the parts of our tooth with the help of a labelled diagra...

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  9. (a) Name the main organs of the human digestive system. Also name the ...

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  10. Which of the following has the longest small intestine ?

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  11. The process of obtaining food by Amoeba is known as :

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  12. The organism having parasitic mode of nutrition is:

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  13. One of the following organisms has a saprophytic mode of nutrition. Th...

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  14. The length of small intestine in a human adult is about :

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  15. The process of digestion of food in humans begin in:

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  16. The process of digestion in humans is completed in:

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  17. In human digestive system, bile is secreted by:

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  18. Two of the following organisms have a holozoic mode of nutrition. Thes...

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  19. The autotrophic mode of nutrition requires :

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  20. The correct order of steps occurring in nutrition in animals is :

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