Worksheet Solutions

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1. Rhizobium bacteria, lives in the nodules of the roots of leguminous plants, enrich the soil with nitrogen.
2. The holozoic is a type of nutrition in which an organism takes in food by feeding upon it and then utilizes it to get energy for life processes.
3. The Salivary glands produce a digestive juice called saliva that breaks down the starch present in the food into sugars.
4. The mastication is a process in which chewing breaks down the food into small pieces and mixes it with saliva.

li>The bacteria present in our mouth react with the leftover food and the sugar, forms a thin, sticky layer called plaque on the surface of teeth.

5. The inner wall of the stomach contains gastric glands, which secrete digestive juices which contain three substances hydrochloric acid, pepsin, and mucus.
6. The pushing down of food by the walls of the Oesophagus is called peristalsis.
7. Liver is the largest gland in our body that secretes bile, which is stored in the gall bladder and helps in the digestion of fats.

li>Diarrhea is an infection of the intestine and involves passage of watery stool very frequently.

8. In animals like horses, bacteria present in the caecum help in the digestion of cellulose into glucose.
9. The acids prepared from the mineral resources of the earth are called mineral acids.
10. Sulfuric acid is known as the king of chemicals.
11. The most commonly used natural indicator is litmus, which is a dye extracted from lichens.
12. Methyl orange is a synthetic indicator that gives orange color in neutral solutions.
13. In order to cure indigestion, we take weak bases called antacids, such as milk of magnesia, that neutralizes the effect of excessive acid.
14. Acidic soil is treated with lime or calcium carbonate to neutralize the effect of acid.

Chemical name of milk of magnesia and calamine solution respectively: Magnesium hydroxide and Zinc carbonate.

15. Reaction in which an acid reacts with a base to form a salt and water: Neutralization reaction.
16. Examples of Natural indicators (any 3): Litmus, Turmeric, and Red cabbage juice.
17. Specialized organ in horses, rabbits that digest Cellulose: Caecum.
18. Four chambers of the ruminant stomach: Rumen, Reticulum, Omasum, and Abomasum.
19. Small finger-like projections present in the inner wall of small intestine where the process of absorption takes place: Villi.
20. Type of nutrition in which some plants live in or on the body of other living organisms and derive their ready-made food from them: Parasitic nutrition.
21. Type of plants that feed on dead and decaying plants and animals, convert the organic matter into simple substances: Saprophytes.

Name the Following

1. Chemical name of milk of magnesia and calamine solution respectively: Magnesium hydroxide and Zinc carbonate.
2. Reaction in which an acid reacts with a base to form a salt and water: Neutralization reaction.
3. Examples of Natural indicators (any 3): Litmus, Turmeric, and Red cabbage juice.
4. Specialized organ in horses, rabbits that digest Cellulose: Caecum.
5. Four chambers of the ruminant stomach: Rumen, Reticulum, Omasum, and Abomasum.
6. Small finger-like projections present in the inner wall of small intestine where the process of absorption takes place: Villi.
7. Type of nutrition in which some plants live in or on the body of other living organisms and derive their ready-made food from them: Parasitic nutrition.
8. Type of plants that feed on dead and decaying plants and animals, convert the organic matter into simple substances: Saprophytes.
9. Reserve food material of the plants, also a complex carbohydrate: Starch.