MEDIUM
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Hydathodes are also called as
 

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Important Questions on Transport in Plants

HARD
"Transpiration is a necessary evil". Discuss.
EASY
Draw a diagram of stomata of Rheo leaf and write any two functions of stomata.
MEDIUM
Explain Transpiration pull theory.
HARD

Find correct statements from the following
A) Protein transporters are responsible for maximum rates of transport under saturated state
B) Translocation of substances in bulk flow requires hydrostatic pressure gradient
C) Root pressure plays the greatest contribution for upward movement of water in tall plants
D) Transport proteins of endodermal cells are control points for active transport of ions in two directions

The correct answer is

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.
EASY
A column of water within xylem vessels of tall trees does not break under its weight because of:
HARD
"Transpiration is a necessary evil". Explain.
MEDIUM

Study the diagram and the list given below.

Question Image

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. 

Question Image

Choose the correct combination.

EASY
Which one of the following anatomical structures is involved in guttation?
 
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:
HARD
A submarine has a window of area 30×30 cm2 on its ceiling and is at a depth of 100 m below sea level in a sea. If the pressure inside the submarine is maintained at the sea-level atmosphere pressure, then the force acting on the window is (consider density of sea water =1.03×103 kg m-3 acceleration due to gravity =10 m s-2):
MEDIUM

Given below are two statements:

Statement I: The forces generated by transpiration can create pressures sufficient to lift a xylem sized column of water over 130 metres high.
Statement II: Transpiration cools leaf surfaces, sometimes 10 to 15 degrees, by evaporative cooling.

In the light of the above statements, choose the most appropriate answer from the options given below:

MEDIUM

Match List - I with List - II.

List-I List-II
(a) Cohesion (i) More attraction in liquid phase
(b) Adhesion (ii) Mutual attraction among water molecules
(c) Surface tension (iii) Water loss in liquid phase
(d) Guttation (iv) Attraction towards polar surfaces
EASY

The combination of numbered terms that correctly completes all the following statements is

i. Transport through the phloem is __1__ while transport through the xylem is __2__.

ii. Loading of sugars into the phloem is __3__ at the source.

iii. Movement of water out of the phloem at the sink is __4__.

MEDIUM
The concentration of OH - ions in a solution with the H+ ions concentration of 1.3×10-4M is
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?
EASY
Transpiration and root pressure cause water to rise in plants by:
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