EASY
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Ganong's potometer is used to measure

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Important Questions on Transport in Plants

EASY
If the humidity of the atmosphere suddenly increases substantially, the water flow in the xylem will-
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Identify the correct match of the type of water given in column-I and its character in column-II and select the correct option.

Column-I Column-II
(i) Capillary water (a) present in the form of hydrated oxides of silicon and aluminium.
(ii) Hygroscopic water (b) goes down through large pores between soil particles and reaches the water table.
(iii) Combined water (c) held in between small non-colloidal soil particles.
(iv) Gravitational water (d) held tightly around soil particles by adhesive forces.
MEDIUM
Stomatal movement is not affected by
MEDIUM
Three uniformly watered plants i, ii and iii were kept in 45% relative humidity, 45% relative humidity with blowing wind and 95% relative humidity, respectively. Arrange these plants in the order (faster to slowest) in which they will dry up.
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Given below is a diagram of the stomatal apparatus. Match the labels with the corresponding names of the compounds. 

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Choose the correct combination.

MEDIUM
Take two plants, keep plant A in very dry conditions and plant B in high humidity. Simultaneously, immerse the roots of both plants in water with a red dye. What would you observe?
HARD
Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options:
MEDIUM
Which of the following facilitates opening of stomatal aperture?
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Study the diagram and the list given below.

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i) Chloroplast

ii) Epidermal cell

iii) Guard cell

iv) Subsidiary cell

v) Stomatal pore

The correct match is

EASY
Which one gives the most valid and recent explanation for stomatal movements?
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Transpiration and root pressure cause water to rise in plants by:
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Observe the apparatus carefully and then answer the questions that follow: 

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State the use of water reservoir.

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Give suitable explanation for the following:

Cork and bark of trees help in preventing loss of water.
 

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Observe the apparatus carefully and then answer the questions that follow: 

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Name the apparatus.

 

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Observe the apparatus carefully and then answer the questions that follow: 

State the purpose of this apparatus.

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EASY
List three anatomical adaptations of the leaf that checks excessive transpiration.
HARD

The apparatus shown below is used in an experiment to investigate water relationships in plants :

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What is the function of the oil in the graduated tube?

 

EASY

An experiment was set up as shown in the figure given on the side. Answer the following questions:

What is the colour of cobalt chloride paper when it is dry and when it is wet?

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MEDIUM

Observe the apparatus carefully and then answer the questions that follow: 

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What happens to the movement of air bubbles if the apparatus is kept in sunlight?