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Most of the transpiration in tall trees occurs through

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Important Questions on Transport in Plants

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If the humidity of the atmosphere suddenly increases substantially, the water flow in the xylem will-
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?
MEDIUM
Stomatal movement is not affected by
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Transpiration and root pressure cause water to rise in plants by:
MEDIUM
Which of the following facilitates opening of stomatal aperture?
EASY
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is
EASY
Which one of the following anatomical structures is involved in guttation?
 
MEDIUM

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

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.

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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.
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Which one gives the most valid and recent explanation for stomatal movements?
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.
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:
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The diagram represents a certain physiological process in plants.

Why is the pot covered with a polythene bag? 

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 List three ways a plant transpires.
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The diagram represents a certain physiological process in plants.

Name the process.

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The stomata in CAM plants open during
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Three plants A, B and C are placed in a beaker containing coloured water. The water in each beaker is covered with a layer of oil. The leaves were removed from plant B while plant C was exposed to strong light.

(a) In which plant, A. B or C, would the water move up fastest?
(b) In which plant would water move slowly?
(c) Why is the water covered with oil?
(d) What is being investigated by this experiment?
 

EASY

State the use of capillary tube in the given apparatus.

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