Practice Questions CBSE - Science Class 10 (2023 Boards)

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Question 17 [Assertion Reasoning] Important

Question 18 [Assertion Reasoning] Important

Question 19 [Assertion Reasoning] Important

Question 20 [Assertion Reasoning]

Question 21 (Choice 1) Important

Question 21 (Choice 2)

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Question 25 (Choice 1)

Question 25 (Choice 2)

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Question 29 (Choice 1)

Question 29 (Choice 2) Important You are here

Question 30 Important

Question 31 (a)

Question 31 (b) Important

Question 32 (Choice 1)

Question 32 (Choice 2) Important

Question 33 (a)

Question 33 (b)

Question 33 (c) Important

Question 34 (a) - Choice 1

Question 34 (b) - Choice 1 Important

Question 34 (c) - Choice 1

Question 34 (a) - Choice 2 Important

Question 34 (b) - Choice 2]

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Question 35 (a) - Choice 1 Important

Question 35 (b) - Choice 1 Important

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Question 36 Important

Question 37 (a) - Choice 1 [Case Based]

Question 37 (b) i - Choice 2 [Case Based] Important

Question 37 (b) ii - Choice 2 [Case Based] Important

Question 38 (a) - Choice 1 [Case Based]

Question 38 (b) - Choice 1 [Case Based] Important

Question 38 (c) - Choice 1 [Case Based]

Question 39 (a) - Choice 1 [Case Based] Important

Question 39 (b) - Choice 1 [Case Based]

Question 39 (c) - Choice 1 [Case Based]

Question 39 (d) - Choice 1 [Case Based] Important

Question 39 (d) - Choice 2 [Case Based] Important

Two major forces help in the transport of water in a plant. Force A is the driving force in the movement of water during the day, whereas force B helps the movement of water in a plant during the night or during the day when humidity is very high. 

(a) Identify force A and force B. 

(b) Describe how each of these forces helps in the movement of water in a plant.

 

Answer:

(a) Force A: transpirational pull  

Force B: root pressure

(b)

  • Root pressure is a force or the osmotic pressure generated in the roots .
  • It drives the fluids and other ions from the soil in upwards directions into the plant’s vascular tissue
  • Evaporation of water from leaves of a plant is called transpiration.
  • Reduced pressure at the top of the xylem vessels creates a suction which pulls up water through the xylem. 
  • Thus transpiration cannot occur at night/on a humid day when rate of evaporation is low.

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo