Question

13. Answer the following question numbers 13(a) to 13(d) on the basis of your understanding 0f the

following paragraph and the related studied concepts

During respiration in an organism A, one molecule of glucose produces 2 ATP molecules while in

respiration of another organism B, one molecule of glucose produces 38 ATP molecules.

13(a) Which organism is undergoing aerobic respiration A or B?

13(b) Which type of organism can convert glucose into alcohol?

13(c) Name one organism which behaves like A

13(d) Name one organism which behaves like B

14. In the following chemical reaction ―Zinc Oxide reacts with carbon to produce zinc metal and carbon

monoxide‖

ZnO+C----Zn+CO

(a) The substance getting oxidized is --------------and substance getting reduced is ------------

(b) State the reason for choosing the substance in (a)

(c) Name the type of reaction

(d) Give another type of example of similar type of reaction

SECTION - B

15. What is the commercial unit of electrical energy? Represent it in terms of joules.

16. Which among the following changes are exothermic or endothermic in nature?

(a) Decomposition of ferrous sulphate

(b) Dilution of sulphuric acid

(c) Dissolution of sodium hydroxide in water

(d) Dissolution of ammonium chloride in water

17. State the role of the following in human digestive system:

(i) Hydrochloric acid (ii) Villi

18. What is electrical resistivity of a material? What is its unit? Describe factors on which the resistance

of conducting wire depend



OR

A bulb is rated at 220V – 100W. What is its resistance? Five such bulbs burn for 7 hours. What is the

electrical energy consumed? Calculate the cost if the rate is Rs. 2.30 per unit.

19. State the type of chemical reactions and chemical equations that take place in the following:

(i) Magnesium wire is burnt in air.

(ii) Electric current is passed through water.

OR

Write the essential condition for the following reaction to take place:

2AgBr—-> 2Ag + Br2

Write one application of this reaction.

20. List in tabular form three differences between arteries and veins.

OR

State in brief the function of:

(i) renal artery

(ii) kidney

21. What is saliva? State its role in the digestion of food.

22. Calculate the total cost of running Electric heater of 1000W for 5 hrs daily in the month of

September, if the rate of one unit of electricity is Rs. 6

23. 2g of ferrous sulphate crystals are heated in a dry boiling tube.

(i) Name the type of chemical reaction taking place.

(ii) Write the chemical equation for the reaction.

24. Explain the process of nutrition in Amoeba​

Answer 1

Answer:

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