NCERT Notes for Class 8 | NCERT Quiz | NCERT Standard 8 - Science

15 Sep 2011 By Admin
All questions are based on Chapter 1 : Nutrition in Animals

1. During digestive process of animals,
A. Carbohydrates get broken into simple sugars like glucose
B. Fats into fatty acids and glycerol
C. Proteins into amino acids.
D. All the above


2. The absorbtion of food happens in which part of alimentary canal ?
A. Buccal cavity
B. Stomach
C. Small intestine
D. Large intestine

3. The acid produced by Stomach which helps in killing bacteria that enter along with the food?
A. Hydrocloric acid
B. Sulphuric acid
C. Citric acid
D. Nitric acid

4.The energy releasing process inside cell is
A. Glucose breaks down with the help of oxygen into CO2 and H2O, and energy is released
B. Protiens breaks down with the help of oxygen into CO2 and H2O, and energy is released
C. Fats breaks down with the help of oxygen into CO2 and H2O, and energy is released
D. None of these

5. The length of small intestine is approximately
A. 5 meters
B. 7.5 meters
C. 10 meters
D. 12.5 meters

6. The order of digestive process is?
A. (i) ingestion, (ii) digestion,(iii) absorption, (iv) assimilation and (v) egestion
B. (i) ingestion, (ii) absorption, (iii) assimilation, (iv) digestion and (v) egestion
C. (i) ingestion, (ii) digestion,(iii) absorption, (iv) assimilation and (v) egestion
D. (i) ingestion, (ii) assimilation (iii) absorption, (iv) digestion,and (v) egestion

7. Digestion of carbohydrates, like starch, begins in
A. Buccal cavity
B. Stomach
C. Small intestine
D. Pancreas

8. Oral Dehydration Solution can be considered as a first aid for which disease
A. Viral fever
B. Diarrhoea
C. Tyfoid
D. None of these

9. Grasses are rich in what type of carbohydrates, in which ruminants use certain bacteria present in their body to digest
A. Starch
B. Glycogen
C. Cellulose
D. None of these

10.Which organism ingests its food with the help of its false feet or pseudopodia
A. Protozoa
B. Amoeba
C. Cellulose
D. None of these

Know more about Answers
1.The components of food such as carbohydrates,protiens,fats etc are complex substances. These complex substances cannot be utilised as such. So they are broken down  into simpler  substances.  The breakdown of complex components of food into simpler substances is called digestion.
2. The   food   passes through a continuous canal which begins at the buccal cavity and ends at the anus. The canal can be divided into various compartments: (1) the  buccal cavity, (2)  foodpipe or oesophagus ,   (3)   stomach,   (4) small  intestine, (5)  large intestine ending in the rectum and (6) the anus. These parts together form the  alimentary canal.The inner walls of the small intestine have thousands of finger-like outgrowths. These are called  villi.The villi increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its sur face.  The surface of the villi absorbs the digested food materials and pass it to blood vessels.
3. The  inner lining of the stomach secretes mucous, hydrochloric acid and digestive juices. The mucous  protects the lining of the stomach.  The digestive juices break down the  proteins into simpler substances.
4. Lichens are composite organisms consisting of a symbiotic association of a fungus (the mycobiont) with a photosynthetic partner (the photobiont or phycobiont), usually either a green alga or cyanobacterium.  Lichens are widespread and may be long-lived;however, many are also vulnerable to environmental disturbance, and may be useful to scientists in assessing the effects of air pollution,ozone depletion, and metal contamination.
5. The small intestine is highly coiled and is about 7.5 metres long. It receives secretions from  the liver and the pancreas. Besides, its wall also secretes juices.
7. Digestion of carbohydrates, like starch, begins in the buccal cavity. The digestion of protein starts in the stomach. The bile secreted from the liver, the pancreatic juice from the pancreas and the digestive juice from
the intestinal wall complete the digestion of all components of food in the small intestine. The digested food is absorbed in the blood vessels in the small intestine.
8. Diarrhoea is the condition of passing watery stool frequently.

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