Chhattisgarh State Board Class 7 History Chapter 9 Nutrition in Living Organisms Exercise Fill in the blanks, Answer the following question here.
(1) Fill in the blanks –
(1) ——- are needed to carry out metabolic activities.
Answer:- All living beings.
(2) Food digested by ——- formed in digestive glands.
Answer:- Enzymes.
(3) Digestion in Amoeba is ——-.
Answer:- Intercellular.
(4) In human being, digested food is absorbed in ——.
Answer:- Small intestine.
(5) In cow, cellulose is digested in the ——-.
Answer:- Ruminant.
(2) Answer the following question:-
(1) What is the difference in the mode of nutrition in autrotophs heterotroph?
Answer:- Difference in the mode of nutrition in autrotophs and heterotroph.
(1) Animal are heterotroph because, for their requirements, they depend upon the food prepared by plants.
(2) Amoeba takes food with the help of pseudopodia. Where Hydra does with the help of tentacles and frog traps its food with lit tongue.
(3) All green plants make their own food in the presence of sunlight, using carbon dioxide and water. Such plants are called autotroph.
(4) The photosynthesis carried out by variegated leaves due to the presence of chlorophyll. Cuscuta plant sents out special root-like structure called it haustoria into the body of the host and draw nutrient from it.
(3) Which organs help Amoeba and Hydra in ingesting food?
Answer:- (i) Pseudopodia help amoeba in ingesting food.
(ii) Tentacles help hydra in ingesting food.
(4) Draw a labeled diagram of the human digestive system and explain the process of digestion of starch.
Answer:- (1) Digestion of starch, starts in the mouth itself. Food reaches the stomach from the buccal cavity via the oesophagus.
(2) Enzymes coming from stomach, intestine and digestive glands mix with the food and digest the remaining starch.
(5) Explain digestion in grass eating animals.
Answer:- (i) Grass eating animal quickly swallow the grass and attire it in a part of the stomach called rumen.
(ii) In rumen, food get partially digested and is called cud. But later the cud returns to the mouth in small lumps and animal chew it again.
(iii) The grass is rich in cellulose, a type of carbohydrate. In ruminants, the cellulose of the food is digested by the action of certain bacteria present in the rumen of grass eating animal.