Question

1. Which is the plant disease caused by micro-organism?

(a) Measles (b) Small pox (c) Citrus Canker (d) Polio

2. Rayon is obtained by

(a) Petroleum products (b) Fully synthetic method

(c) Chemical treatment of wood pulp (d) All methods

3. Sodium metal is stored in

a)Oil (b) Petrol (c) Kerosene (d) Diesel

4. Observe the figure and answer the following questions :

(i)Name the micro-organism

(ii) Name the group to which it belongs.

(iii) Name the food items on which the organism grows.

(iv) Is it safe to eat infected bread?

(v) Does it grow well in dry or in moist conditions?

5. A black, tough and porous substance is

(a) Coal tar (b) Coal gas (c) Coke (d) Diesel

6. Name the layer which is present outside the cell membrane in plant cell.

7. Which micro-organism is used in making curd from milk?

8. Write True/False against the following statements:

(a) Oxygen in air is an exhaustible natural resource.

(b) Resources which are present in unlimited quantity in nature are called exhaustible

natural resources.

(c) Wildlife is an exhaustible natural resource.​

Answer 1

Answer:

1. c

2. d

3. c

5. c

6. cell wall

7. yeast

8 false

false

false

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Answer 2

Answer:

1) Citrus Canker

2)Chemical treatment of wood pul

3) Oil

5)Coke

6)cell wall

7)Lactobacillus delbrueckii

8)(a) false

(b) false

(c) True