Biology : Transport in Plants

Which of the following criteria does not pertain to facilitated transport?

• Requirement of special membrane proteins

• High selectivity

• Transport saturation

• Uphill transport

In which one of the following, expenditure of energy is required?

• Osmosis

• Diffusion

• Active transport

• Passive transport

Guttation is a process of loss of water in

• liquid form containing dissolved minerals

• liquid form without dissolved minerals

• vapour form with minerals

• vapour form without minerals

Engulfing ofsolid materials by cells is called

• pinocytosis

• phagocytosis

• active transport

• autolysis

Pick the reaction from the following, where a water molecule is removed and reduction of NAD⁺ does not occur in the reactions of respiration.

I. Succinic acid $\to$ Fumaric acid
II. Malic acid  $\to$ Oxaloacetic acid
III. 2-phosphoglycerate $\to$ phosphoenol pyruvic acid
IV. Pyruvic acid $\to$ Acetyl Co-A

The correct answer is

• I, IV

• I, II

• II, III

• I, III

With reference to water potential of a plant cell, the relationship is represented by

• ${\mathrm{\psi }}_{\mathrm{w}} = {\mathrm{\psi }}_m+ {\mathrm{\psi }}_{\mathrm{s}} + {\mathrm{\psi }}_{\mathrm{p}}$

• ${\mathrm{\psi }}_{\mathrm{w}} = {\mathrm{\psi }}_{\mathrm{m}} - {\mathrm{\psi }}_{\mathrm{s}} - {\mathrm{\psi }}_{\mathrm{p}}$

• ${\mathrm{\psi }}_{\mathrm{w}} = {\mathrm{\psi }}_{\mathrm{m} }- {\mathrm{\psi }}_{\mathrm{s}} + {\mathrm{\psi }}_{\mathrm{p}}$

• ${\mathrm{\psi }}_{\mathrm{w}} = {\mathrm{\psi }}_{\mathrm{m} }+ {\mathrm{\psi }}_{\mathrm{s}} - {\mathrm{\psi }}_{\mathrm{p}}$

Identify the wrong statement.

• The degree of decrease of chemical potential of water depends on concentration of solute

• Bacteria and fungal spores are killed when they enter into pickels and jams due to plasmolysis

• The process of water excudation is called transpiration

• Reverse plasmolysis will occur when flaccid cells are placed in hypotonic solution

Match the following columns and choose the correct option from the codes given below

Column I (Type of Pressure in a cell)	Column II (Characteristics)
A. Osmotic pressure	1. Provide turgidity to cells, tissues and softer organs
B. Turgor pressure	2. Control entry of water into cells
C. Wall pressure	3. Prevents bursting of cells and limits expansion
D. Diffusion pressure deficit	4. Helps in retaining water inside cells

• A - 1; B - 3; C - 2; D - 4

• A - 2; B - 4; C - 1; D - 3

• A - 3; B - 2; C - 4; D - 1

• A - 4; B - 1; C - 3; D - 2

A plant cell is placed in a solution whose solute concentration is twice as great as the concentration of the cell cytoplasm. The plasma membrance is selectively permeable, allowing water but not solutes to pass through. What will happen to the cell?

• The cell will swell because of endosmosis

• The cell will shrivel because of exosmosis

• The cell will shrivel because of active transport of water

• No change will occur because of hard impervious cell wall present

Read the following statements with respects to rate of transpiration.

I. In dry atmosphere, the relative humidity is low so, the rate of transpiration increases.

II. Slow breeze promotes the rate of transpiration.

III. ABA promotes transpiration.

IV. A high salt concentration in soil water increases transpiration.

Choose the incorrect options.

• I and II

• II and III

• III and IV

• I and IV