Transport in plants practice · Mixed difficulty

Plant obtain carbon and most of their oxygen from

“Porins” are chemically?

Loss of water in the form of vapours from the living tissues of aerial plant parts is called

Which of the following affect the transport of molecules when carrier mediated facilitated diffusion is involved?

Which of the following statements is incorrect?
(i) Less than 1 per cent of the water reaching the leaves is used in photosynthesis.
(ii) Most of the water flow in the roots occurs via the apoplast pathway.
(iii) Suction through a straw is an example of positive hydrostatic pressure.
(iv) Turgor pressure is responsible for enlargement and extension growth of cells.

The term apoplast signifies

Phloem sap is mainly ….. and Choose the correct pair of options?

Study the following and identify the mismatch

Stomata which can open at night, are present in

Which of the following theories for ascent of sap was proposed by an eminent Indian scientist J C Bose?

Element involved in the opening and closing of stomata, stomatal regulation is

Phloem mainly contains all of the following, except

When a carrier protein facilitates the movement
of two molecules across the membrane in
same direction, it is called:

Which of the following lacks stomata?

Passage cells are thin-walled cells found in

Attraction of water molecules to polar surfaces is known as

Assertion: Pure water has greatest water potential.

Reason: Pure water contain maximum free water molecule.

Read the following statement and choose the correct one from the codes given below
I. The apoplastic movement of water takes place exclusively through intercellular spaces and cell wall without crossing any membrane
II. Symplastic movement occurs from cell to cell through plasmodesmata, ., adjacent cells are connected through plasmodesmata
III. Permeability of a membrane depends on its composition and chemical nature of the solute
IV. Solutes present in a cell increases the free energy of the water or water potential

How many litres of water is absorbed by 10 corn plant in 50 days?

Cell A has ${\Psi _w} - 3$ bars and cell B has ${\Psi _w} - 8$ bars. The movement of water will be from

Why all the minerals present in soil can not be passively absorbed by roots?

Graham’s law is correlated with

${\psi _w} = {\psi _s}$ in

Which of the following theory gives the latest explanation for the closure of stomata?

Water potential gradient can be best defined as

In companion cells, during translocation, organic nutrient is loaded mainly in the form of

Water potential increases due to

What is required for the transport of substances through a membrane from a region of lower
concentration to higher concentration?

Uphill transport is a type of

The process by which water is absorbed by solids like colloid causing them to increase in volume, is called