Ques 1: Fill in the blanks:
Fig: Buccal cavity2. liver
3. digestive juices
5. food vacuole
Ques 2: Mark ‘T’ if the statement is true and ‘F’ if it is false:
Fig: Liver with gallbladderQues 3: Choose the correct option::
Ques 4: Match the items in column I with those in column II:
a) Products of digestion
b) Fatty acids and glycerol
d) Amino acids
Carbohydrates ---- Sugar.
Proteins --- Amino acids.
Fats --- Fatty acids and glycerol.
Food components--- Products of digestion
Ques 5: What are villi? What are their location and function?
Ans: The inner wall of the small intestine has thousands of finger-like outgrowths called villi.
These are found in small intestine. The villi increase the surface area for absorption of food.
Ques 6: Where is the bile produced? Which component of the food does it digest?
Ans: Bile is produced in the liver and is stored in a sac called the gall bladder. The bile plays an important role in the digestion of fats.
Ques 7: Name the type of carbohydrates that can be digested by ruminants but not by humans. Give the reasons also.
Ans: Cellulose is the carbohydrate that can be digested by ruminants. Ruminants have large sac like structure between the small intestine and large intestine. The cellulose of the food is digested by the action of certain bacteria which are not present in human beings.
Ques 8: Why do we get instant energy from glucose?
Ans: Because glucose easily breakdown in the cell with the help of oxygen and give carbon dioxide, water and energy
Ques 9: Which part of the digestive canal is involved in:
Fig: Large intestine
Ques 10: Write one similarity and one difference between nutrition in amoeba and human beings.
Ans: Similarity: During the digestion of food, in amoeba digestive juices are secreted into the food vacuole. They act on the food and break it into simpler substances. In human being, the inner walls of stomach and the small intestine also secrete the digestive juices. The digestive juices convert complex substances of food to simpler ones.
Difference: Amoeba feeds on some microscopic organisms. When it senses food, it pushes out pseudopodia around the food particles. The food is trapped in a food vacuole. Human beings take food through the mouth, digest and utilize it. The food is gradually digested as food travels through the various compartments.
Ques 11: Match the items of column I with suitable items of column II:
a)bile juice secretion
b)storage of undigested food
e)digestion is completed
f)absorption of water
salivary gland---saliva secretion
stomach --- acid release.
liver --- bile juice secretion.
rectum --- storage of undigested food.
small intestine --- digestion is completed.
large intestine --- absorption of water.
Fig: Small intestine
Ques 12: Can we survive only on raw, leafy vegetables/grass? Discuss.
Ans: We know that including all animals, fungi, many bacteria, non-green plants, and human beings do not possess the ability to synthesize their own food. Therefore depend on autotrophs for their food supply either directly or indirectly.
The green plants (leafy vegetables/grass) trap solar energy and manufacture their food in the form of glucose. So, leafy vegetables and grass can provide sufficient energy required for the survival of human beings.