Question

Note- Attempt all questions:
M.M: 20
A. Tick correet options
1. Which amongst the following represents a chemical change?
a) Freezing of water
c) Dissolution of sulphur in carbon disulphide
1.
b) Lique faction of air
d) Cooking of food
2. The correct formula of Aluminum sulphate is-
1
a) Al,SO.
c) AISO,
3. The abbreviation used for a substance dissolved in water is-
b) Al3(SO)2
d) Al:(SO)3
1
a) au
b) as
c) aq
d) ao
4. A chemical equation is a symbolic representation of-
1
a) Chemical compound b) chemical reaction c) Chemical element d) None of these
5. The substances which undergo chemical change in a reaction are called-
a) Chemical compound b) Reactants
e) Products
d) Mixtures
6. The autotrophic mode of nutrition requires-
b) Chlorophyll
1
a) Carbon dioxide and water
c) Sunlight
d) All of these
7. The enzyme responsible for fat digestion is-
a) Trypsin
b) Lipase
c) Amylase
d) pepsin
1.
8. The xylem in plants are responsible for-
a) Transport of water
b) Transport of food c) Transport of amino acid
d) Transport of oxygen
9. Salivary amylase acts upon-
a) Fats
b) Proteins
c) Starch
d) Glucose
10. A plant kept in polythene sheet gives water droplets because of-
b) Respiration
1.
d) Photosynthesis
a) Translocation
c) Transpiration
B. Fill in the blanks-
1
11. The cup-shaped capsule of a nephron is called.
1
12. Excretion in Amoeba takes place through
1.
13. The main nitrogenous excretory products are
Reaction
14. "Rusting of iron is an example of
Catalyst (pt)
15. N2 (g) + 3H2 (g)
773 K
C. Very short answer question ( each)
16. Balance the following equations-
CH4 + Oz→ CO, + H20
17. Why do we apply paint on iron articles?
18. A solution of a substance 'X' is used for white washing.
a) Name the substance 'X' and write its chemical formula.
1
19. Why do we get muscular cramps on vigorous exercise?
20. What is the role of acid in stomach?
***​

Answer 1

Explanation:

1) d.

2) Al2(SO4)3.

3) c.

4) b.

5) b.

6) a.

7) b.

8) a.

9) c.

10) c.

11) glomerular or Bowman's capsule

12) diffusion with the help of contractile vacuole

13) false

14) false

15) N2(g)+3H2(g)=2HN3(g)+heat

17) to prevent from rusting

18) calcium oxide or quicklime

20)Hydrochloric acid plays a major role in the process of digestion

mark my answer as brainiest answer ....,.

Answer 2

Answer:

1(d)

2(b)

4(b)

5(b)

6(d)

7(b)

8(a)

9(c)

10(c)

11-bowmans capsule

12-contractile vacuole

13-urea

14- metal corrosion

16-CH4+2O2-Co2+2H2O

17-to prevent them from rusting

18-calcium oxide(quicklime)

19-due to muscular fatigue

20-to kill germs which we have consumed with our food.