Plant Physiolog...

Consider the following statements and mark your answer accordingly:

a. The direction of translocation is essentially multidirectional in case of water and unidirectional in case of minerals and organic solutes.
b. Substances move over short distances through diffusion and cytoplasmic streaming supplemented by active transport.

In which of the following means of transport do the movable carrier proteins employ ATP energy for transport along the membrane?

a. Active transport
b. Diffusion
c. Facilitated diffusion

Diffusion is the movement of particles from high concentration area to low concentration area. Which of the following factors influence diffusion?

a. Density
b. Permeability of medium
c. Temperature
d. Diffusion pressure gradient

Osmotic pressure is the pressure required to completely stop the entry of water into an osmotically active solution across a semipermeable membrane. Which of the following have the maximum osmotic pressure?

Osmosis is the movement of solvent or water from higher chemical potential to lower chemical potential when solute particles are not allowed to diffuse. Which of the following is the characteristic of osmosis?

Turgor pressure is the pressure which develops in the confined parts of an osmotic system due to osmotic entry of water into it. Which of the following is not a function of turgor pressure?

Which of the following controls entry of water into cells and water relations among cells?

Deplasmolysis is the swelling up of a plasmolysed protoplast under the influence of hypotonic solution or water. Which of the following is a characteristic of deplasmolysis?

Which of the following products is/are eliminated by plants by diffusion through stomata, lenticels and epidermis?

Water absorption is of two types - active and passive. Which of the following statements about passive water absorption is correct?

Which of the following theories explaining the mechanism of ascent of sap believes that the innermost cortical cells of the root absorb water from the outer side and pump the same into xylem channels?

Which of the following types of transpiration occurs through corky covering of the stems continuously during day and night?

The loss of water in the vapour form from the exposed parts of a plant is called transpiration. Which of the following is a plant factor affecting transpiration?

Translocation of organic solutes can occur in different directions. Which of the following translocations is little, except when source and sink lie on the opposite sides?

Consider the following statements and mark your answer accordingly:

a. There are only two paths for long distance translocation, tracheary elements and sieve tubes.
b. Sucrose is the most suitable form of carbohydrate translocation as it is non reducing and chemically stable.