Transport in Plants

In addition to the cell membrane, another important determinant of movements of molecules through the plant cell is

1. cell wall.
2. tonoplast.
3. nuclear membrane.
4. vesicles.

A mustard plant absorbs water equal to its own weight in about

1. 5 hours.
2. 8 hours.
3. 15 hours.
4. 24 hours.

Water moves in the cells in an organized way through

1. simple porins.
2. complex porins.
3. aquaporins.
4. neoporins.

Porins form the large pores in

1. cell wall.
2. cell membrane.
3. golgi bodies.
4. endoplasmic reticulum.

Transport rate during facilitated diffusion reaches maximum

1. once all the lipid molecule transporters are used.
2. half the lipid molecule transporters are used.
3. once all the protein molecule transporters are used.
4. half the protein molecule transporters are used.

Loss of excess water in the form of droplets from the tips of the leaves is called as

1. guttation.
2. transpiration.
3. bleeding.
4. mass flow.

The apoplastic movement of water in plants occurs through

1. interconnected protoplast.
2. plasmodesmata.
3. cell-walls.
4. plasma membrane.

The movement of substances in bulk in a plant body from one point to another as a result of pressure difference is known as

1. diffusion.
2. mass flow.
3. osmoregulation.
4. guttation.

The good example of imbibition is

1. dry seeds in the storage.
2. seeds in a fruit.
3. swollen seeds.
4. immature seeds.

Plant cells kept in pure water will become

1. turgid.
2. flaccid.
3. plasmolysed.
4. limp.

A plasmolysed cell can be deplasmolysed, if it is placed in a

1. isotonic solution.
2. hypotonic solution.
3. hypertonic solution.
4. monotonic solution.

If the osmotic pressure of the external solution is more than the osmotic pressure of the cytoplasm, the external solution is called

1. isotonic.
2. hypotonic.
3. hypertonic.
4. monotonic.

If osmotic pressure of the external solution is equivalent to the osmotic pressure of the cytoplasm, then the external solution is called as

1. isotonic.
2. hypotonic.
3. hypertonic.
4. monotonic.

Osmosis can be defined as the process in which

1. water diffuses from lower concentration to higher concentration.
2. solutes diffuse from lower concentration to higher concentration.
3. active transport of ions take place.
4. passive transport of ions take place.

The greatest water potential is that of

1. a solution.
2. a solute.
3. pure water.
4. cell sap.

A large central vacuole is present in

1. a new animal cell.
2. an old animal cell.
3. a new plant cell.
4. an old plant cell.

In terms of water movement, the plant cell wall is

1. impermeable.
2. semi permeable.
3. partially permeable.
4. permeable.

For plant growth and productivity, the factor which often falls in the category of limiting factors is

1. air.
2. water.
3. nitrogen.
4. potassium.

The carrier proteins are

1. specific.
2. non-specific.
3. simple.
4. complex.

The process using energy to pump molecules across the cell membrane against a concentration gradient is

1. diffusion.
2. facilitated diffusion.
3. passive transport.
4. active transport.

The transport of two molecules together to cross the membrane by diffusion with the support of proteins, in the same direction is called as

1. symport.
2. dueport.
3. crossport.
4. uniport.

Facilitated diffusion from a high to lower concentration

1. needs energy to carry the process.
2. happens without expenditure of energy.
3. converts kinetic energy into potential energy.
4. produces some energy.

Diffusion is always

1. from the lower concentration to the higher concentration of the molecules.
2. from the higher concentration to the lower concentration of the molecules.
3. between the solutions having similar concentration on both the sides.
4. between two solutions, which are entirely different from each other in their constituents.

The only means of gaseous movement in a plant body is

1. active transport.
2. diffusion.
3. osmosis.
4. convection.

The supply of food in a healthy plant is in

1. upward direction.
2. downward direction.
3. radial direction.
4. multi-directions.

In well-rooted plants the transport of water is essentially in

1. upward direction.
2. downward direction.
3. radial direction.
4. multidirectional.

Transport of photosynthates to longer distances takes place through

1. phloem.
2. xylem.
3. plant surfaces.
4. medullary rays.

Transport of water and minerals to longer distances takes place through

1. phloem.
2. xylem.
3. plant surfaces.
4. intercalary meristem.