Which of the following is not a purpose of Transpiration?

  • Absorption of minerals and water from the soil and transport in the plants

  • Supplies water for photosynthesis

  • Evaporative heating

  • Maintains the shape and structure of the plants by keeping cells turgid

Transpiration can cool the leaf surface up to

(2) Up to 70 degrees

  • 10 to 15 degrees

  • (3) Up to 2 degrees

  • 3

  • Up to 50 degrees

The humidity of rainforests is largely due to

  • Guttation

  • Transpiration

  • Photosynthesis

  • Respiration

The evolution of C4 plants is probably one of the strategies to

  • Maximize oxygen availability

  • Maximize Carbon dioxide availability

  • Minimize water loss

  • Both B and C

C4 plants are …….as efficient as C3 plants in term of making sugar and lose only ….. of the water in comparison.

  • Half, double

  • Twice, half

  • One fourth, one third

  • Twice, one third

Most of the minerals are absorbed through active transport because

  • Minerals are charged particles

  • Minerals are insoluble in lipid bilayer

  • The amount of mineral is less in soil

  • All of these

Which of the following statements is not correct?

  • Some ions also move in epidermal cells passively

  • The active uptake of ions is partly responsible for the water potential gradient in the roots.

  • Uptake of water by the roots is through osmosis

  • Transport proteins of pericycle are control points where a plant adjusts the quantity and types of solute which will cross the cell membrane

What is the chief sink of mineral elements in plants?

  • Growing regions of the plant

  • Enlarged cells

  • Soil

  • Root hair

The most readily mobilised elements from older dying leaves are

  • P,K

  • S,N

  • N

  • All of these

Which of the following is a part of structure and is not remobilised?

  • K

  • N

  • Ca

  • S

Which of the following is incorrect statement?

  • An analysis of xylem exudate suggests that some of the nitrogen travels as inorganic ions and much of it is carried in the organic form as amino acids

  • Small amount of P and S is also carried as inorganic compounds in xylem exudate

  • There is exchange of material between xylem and phloem

  • Xylem transports inorganic nutrients while phloem transports organic materials, this observation was proved wrong by the analysis of xylem exudate

The source and sink may be reversed

  • Depending on the season

  • Depending on the plant's needs

  • Depending on the phloem type

  • Both A and B

Phloem sap is mainly

  • Water and minerals

  • Water and sucrose

  • Hormones and amino acid

  • Hormones and water

Which of the following is an accepted mechanism for translocation of sugars from source to sink?

  • Cohesion Flow hypothesis

  • Pressure Flow hypothesis

  • Mass fusion hypothesis

  • Tension flow hypothesis

Girdling experiment suggests that

  • Xylem is for water and mineral transport

  • Phloem is for translocation of food

  • Transport in phloem is multi directional as well

  • The portion below the ring becomes swollen due to water

The loading at source in the phloem is

  • Diffusion

  • Pressure flow

  • Active transport

  • Imbibition

The unloading at sink from phloem is

  • Diffusion

  • Facilitated Diffusion

  • Active transport

  • Imbibition

At the time of unloading of phloem, which of the following does not happen?

  • High water potential in phloem

  • Returning of water to sink

  • Active transport of sucrose to sink

  • All of these

At the time of loading of phloem which of the following happens?

  • High turgor pressure

  • Flaccid phloem

  • Plasmolysed Phloem

  • Low water potential

First sugar moves to

(At the time of loading of phloem)

  • Companion cells

  • Sieve tube cells

  • Xylem vessels

  • Phloem fibre

Stomatal movement is not affected by

  • Temperature

  • Light
  • O2 concentration
  • CO2 concentration

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 the following options.
  • Both processes can happen together because the diffusion coefficient of water and CO2 is different
  • The above processes happen only during night time.
  • One process occurs happen only day time and the other at night
  • Both process cannot happen simulataneously

In a ring girdled plant

 
  • the shoot dies first
  • the root dies first
  •  the shoot and root die together
  • Neither root nor shoot will die

Which one of the following is correctly matched?
Which one of the following elements in plants not re-mobilized?

Xylem translocates:

What is the direction of movement of sugars in phloem?

Water potential in the leaf tissue is positive (+ve) during:

If cohesion-tension transpiration theory is correct then a break in water column in xylem vessels :

Which one is not related to transpiration?
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