#### Living World of Plants - Plant Physiology Model Questions

9th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 50
8 x 1 = 8
1. A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree straight up. This happens in response to __________

(a)

water and light

(b)

water and minerals

(c)

gravity and water

(d)

light and gravity

2. The chemical reaction occurs during photosynthesis is ________.

(a)

CO2 is reduced and water is oxidized

(b)

water is reduced and CO2 is oxidized

(c)

both CO2 and water are oxidized

(d)

both CO2 and water are produced

3. The bending of root of a plant in response to water is called _________

(a)

thigmonasty

(b)

phototropism

(c)

hydrotropism

(d)

photonasty

4. The root of the plant is __________.
i) positively phototropic but negatively geotropic
ii) positively geotropic but negatively phototropic
iii) negatively phototropic but positively hydrotropic
iv)negatively hydrotropic but positively phototropic

(a)

(i) and (ii)

(b)

(ii) and (iii)

(c)

(iii) and (iv)

(d)

(i) and (iv)

5. Dandelion flowers open the petals in bright light during the day time but close the petals in dark at night. This response of Dandelion flowers is called ___________.

(a)

geonasty

(b)

thigmonasty

(c)

chemonasty

(d)

photonasty

6. Transpiration takes place through _____________.

(a)

fruit

(b)

seed

(c)

flower

(d)

stomata

7. Sunflower follows the path of the sun from__________________.

(a)

south to north

(b)

North to south

(c)

East to West

(d)

west to east.

8. maize plant transpire_______________ gallons of water during its life span.

(a)

34

(b)

44

(c)

64

(d)

54

9. 6 x 1 = 6
10. The shoot system grows upward in response to ___________

()

Light

11. Towards a stimulus :_____________ Away from the stimulus : Negative tropism

()

12. The response of a plant part towards gravity is __________.

()

Geotropism

13. When iodine solution is added for testing starch, part of the leaf with _______ turn blue-black colour.

()

Starch

14. Plants utilize only _______% of the absorbed water for photosynthesis and the other activities.

()

1

15. The leaves of __________closes on touching.

()

Mimosa pudica

16. 5 x 1 = 5
17. The response of a plant part to the chemical stimulus is called phototropism.

(a) True
(b) False
18. When the weather is hot, water evaporates lesser which is due to opening of stomata.

(a) True
(b) False
19. Plants lose water when the stomata on leaves are closed.

(a) True
(b) False
20. The stalk of the Helianthus annus follows the path of the sun from dawn t.o dusk and during night it moves from west to east.

(a) True
(b) False
21. Shoots are said to have negative phototropism white the roots have positive phototropism

(a) True
(b) False
22. 8 x 2 = 16
23. What is nastic movement?

24. Define transpiration.

25. Define photosynthesis.

26. In the given photosynthetic experiment, what will happen to the leaf closed with black paper in starch test? Why?

27. Which is a mesmerizing plant?

28. Name the types of tropisms in plants.

29. What does "photosynthesis" literally mean?

30. Give one example of the insect which traps solar energy

31. 5 x 2 = 10
32. Give an example for a plant whose leaf shows a mesmerizing movement.

33. What is the end product of photosynthesis?

34. Study the pictures below and then complete the table by putting a plus (+) if the shoot or root grows towards the stimulus and a minus (-) if it grows away from it.

Stimulus Light Gravity
Shoot + -
Root ? +

35. What is the other name for thigmonasty?

36. Fill in the blanks:
6CO2+________$\overset { Sunlight }{ \underset { Chlorophyll }{ \longrightarrow } }$ _____ +6H2O+6O2 $\uparrow$

37. 1 x 5 = 5
38. Design an experiment to demonstrate hydrotropism.