Chapter 2 Nutrition In Animals

Question 1. Organisms which prepare food for themselves using simple naturally available raw materials are referred to as

(a) heterotrophs

(b) autotrophs

(c) parasites

(d) saprophytes

Question 2. In the absence of which of the following will photosynthesis not occur in leaves?

(a) Guard cells

(b) Chlorophyll

(c) Vacuole

(d) Space between cells

Question 3. Which of the following statements is/are correct?

(i) All green plants can prepare their own food.

(ii) Most animals are autotrophs.

(iii) Carbon dioxide is not required for photosynthesis.

(iv) Oxygen is liberated during photosynthesis.

Choose the correct answer from the options below:

(a) (i) and (iv)

(b) (ii) only

(c) (ii) and (iii)

(d) (i) and (ii)

Question 4. Pitcher plant traps insects because it

(a) is a heterotroph.

(b) grows in soils which lack in nitrogen.

(c) does not have chlorophyll.

(d) has a digestive system like human beings.

Question 5. The term that is used for the mode of nutrition in yeast, mushroom and bread-mould is

(a) autotrophic

(b) insectivorous

(c) saprophytic

(d) parasitic

Question 6. When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings. Which of the following is the term given to such openings?

(a) Stomata

(b) Lamina

(c) Midrib

(d) Veins

Question 7. Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as

(a) saprophyte

(b) parasite

(c) autotroph

(d) symbiosis

Question 8. Which of the following raw material is available in the air for photosynthesis?

(a) Oxygen

(b) Carbon dioxide

(c) Nitrogen

(d) Hydrogen

Question 9. Potato and ginger are both underground parts that store food. Where is the food prepared in these plants?

Question 10. Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list given below:

Water, minerals, _____________, ______________.

(a) (b)

Question 11. A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves?

Question 12. Unscramble the following to form terms related to modes of nutrition.

(i) RASPAEIT

(ii) ROPEHYTSAP

(iii) TOROPHAUT

(iv) SIBIOMSYS

Question 13. Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram, etc. do not apply nitrogenous fertilizers during cultivation. Why?

Question 14. Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

Question 15. 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 : _______________

Question 16. Observe the diagram given as Figure 1.1 and label the following terms given in the box.

stomatal opening, guard cell

Question 17. Match the organisms given in Column I with their mode of nutrition given in Column II.

Column I Column II

(i) Mushroom (a) Autotrophs

(ii) Green Plants (b) Heterotrophs

(iii) Amoeba (c) Saprophytes

(iv) Cuscuta (d) Parasite

Question 18. 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?

Question 19. Fill in the blanks of the paragraph given below with the words provided in the box.

chlorophyll, energy, food, carbon dioxide, water, photosynthesis

Note: A word can be used more than once.

Leaves have a green pigment called ( a) which captures (b) from sunlight. This (c) is used in the process of ( d) and along with other raw materials like ( e) and ( f) synthesize (g) .

Question 20. Spot as many organisms as possible in the puzzle given as Figure 1.2 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.

Question 21. 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. ,

Question 22. Answer the following questions in one or two words or sentences:

(a) Why should we prefer to use paper bags rather than polythene bags?

(b) Who, out of the following should properly dispose of the garbage – father, mother, elder brother, younger sister?

(c) Which one out of beetles, roundworm and earthworm are used for vermicomposting and why?

Question 23. Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Can you reason why?

Question 24. Boojho and Paheli were eating their food hurriedly so that they could go out and play during the recess. Suddenly, Boojho started coughing violently. Think of the reasons why he was coughing and discuss with your friends.

Question 25. Fill in the blanks using the words listed below.

water, front, intestinal, salts, pseudopodia, back, vacuole

(a) The digestion of all food components is completed by the ____________ juice.

(b) Large intestine absorbs ___________ and some __________ from the undigested food.

(c) Tongue is attached at the _____________ to the floor of the mouth cavity and is free at the _____________.

(d) Amoeba pushes out _____________ around the food and traps it in a food _____________.

Question 26. Label the below given Figure 2.1 as directed below in (i) to (iv) and give the name of each type of teeth.

Fig. 2.1

(i) The cutting and biting teeth as ‘A’

(ii) The piercing and tearing teeth as ‘B’

(iii) The grinding and chewing teeth as ‘C’

(iv) The grinding teeth present only in adult as ‘D’

Question 27. Read the following passage carefully and answer the questions that follows it.

Bile juice is stored in a sac called, gall bladder, located near its organ of secretion, liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released from the pancreas.

(a) Which organ secretes the bile juice?

(b) Why is digestion of fats difficult as compared to that of other nutrients?

(c) How does bile juice help in digestion of fat?

(d) Where is the digestion of fat completed?

(e) Does bile juice digest fat completely?

Question 28. Label the following parts in Figure 2.2 and name them.

Fig. 2.2

(a) The largest gland in our body.

(b) The organ where protein digestion starts.

(c) The organ that releases digestive juice into the small intestine.

(d) The organ where bile juice gets stored.

Question 29. Open your mouth, look into a mirror and try to count the different types of teeth in your mouth. Compare them with Figure 2.3 on page 13 of your NCERT textbook. Record your observations in the table below:

(a) Did you observe any difference in the number of teeth? If yes, could you identify which type of teeth showed the difference?

(b) Compare the number and type of teeth in an adult (say your parents or cousins who have reached the age of 25–30 or more). Note your observation.

Question 30. Solve the crossword given as Figure 2.3.

Fig. 2.3

Across

1. Cream-coloured digestive gland

3. Undigested excretory solid residues

4. Organ that mixes saliva with the food

5. Point of defecation

7. Stored in gall bladder

10. Finger-like outgrowth in the small intestine

13. Kind of taste buds

14. Kills bacteria in the stomach

Down

2. Feeds with the help of pseudopodia

6. Total number of molars in one jaw of an adult

8. Largest gland

9. Watery secretion in the mouth

11. A ruminant

12. Form of food chewed by ruminants