Chapter 2- Nutrition in Animals Class 7 Worksheet – Fill in the Blanks

1. Digestion is the process by which complex food components are broken down into ________ substances for absorption. Answer: simpler
2. Bees and hummingbirds feed on ________ from plants to obtain sugars and energy. Answer: nectar
3. Animals cannot perform photosynthesis, so they must acquire their food from ________ sources. Answer: external
4. The primary function of the large intestine is to absorb ________ and some salts from undigested food, forming faeces. Answer: water
5. The digestive journey begins in the ________, where mechanical digestion starts. Answer: mouth
6. Villi in the small intestine increase the surface area for efficient ________ of digested nutrients into the bloodstream. Answer: absorption
7. Incisors are designed for ________ and biting food, especially useful for slicing through items like fruits and vegetables. Answer: cutting
8. Premolars have a flat surface with multiple cusps and are responsible for grinding and crushing food, especially foods that require more ________. Answer: chewing
9. Mechanical digestion in the mouth increases the surface area for enzymatic action, making it easier for ________ in the digestive system to access and digest nutrients. Answer: enzymes
10. Saliva contains enzymes like ________, which initiate the breakdown of complex carbohydrates into simpler sugars. Answer: amylase
11. The tongue contains specialised sensory cells called taste buds that detect different tastes in food, including sweet, salty, sour, and ________. Answer: bitter
12. The transition from milk teeth to permanent teeth is a crucial milestone in ________ development. Answer: dental
13. Food is propelled down the oesophagus through coordinated muscle contractions called _______________. Answer: Peristalsis
14. Vomiting is a natural reflex that helps remove potentially harmful or indigestible materials from the _______________. Answer: Stomach
15. The stomach has a unique shape resembling a flattened _______________. Answer: J
16. The inner lining of the stomach secretes mucus to protect it from the corrosive effects of stomach acid and _______________. Answer: Digestive enzymes
17. The stomach produces hydrochloric acid to create an acidic environment that helps kill harmful _______________ and activates digestive enzymes. Answer: Bacteria or pathogens
18. The primary function of the stomach is to initiate the digestion of _______________ present in the food. Answer: Proteins
19. The small intestine has a coiled structure and is approximately __________ metres long in humans. Answer: 7.5
20. The liver produces __________, which is stored in the gallbladder. Answer: bile
21. Carbohydrates are broken down into simple sugars like __________ in the small intestine. Answer: glucose
22. Villi increases the surface area for efficient __________ of digested food components. Answer: absorption
23. Absorbed substances, including glucose and amino acids, are transported through the __________ to various organs in the body. Answer: bloodstream
24. The primary function of the large intestine is to absorb __________ and some salts from undigested food material. Answer: water
25. Grass-eating animals, like cows and buffaloes, continuously chew due to their specialised __________ process. Answer: digestive
26. During __________, ruminant animals regurgitate and chew cud to break down complex cellulose in grass. Answer: rumination
27. The presence of specialised bacteria in the rumen of ruminants aids in the breakdown of __________ into simpler, more digestible forms. Answer: cellulose
28. Amoeba captures food by extending __________ around the food particle. Answer: pseudopodia
29. Starfish primarily feed on animals with hard shells and use their tube feet and arms to grasp and open the prey’s __________. Answer: shell
30. After the digestion process is complete, the starfish retracts its __________ back into its body. Answer: stomach

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