Tag: transport in plants

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Questions Related to transport in plants

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

Contact exchange of ions occurs.

  1. Between root and soil particles

  2. Root and coil solution

  3. Cell and external solution

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The contact exchange theory posits that ions adsorbed on the surface of soil particles are exchanged directly with ions on the surface of root hairs through contact.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

A characteristic based on concentration of particles in solution is

  1. Colligative property

  2. Surface tension

  3. Colloidal nature

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Colligative property of a solution is based on the concentration of solute particles but not on its identity. It includes vapor pressure lowering, boiling point elevation, freezing point depression and osmotic pressure. Non-colligative property of a solution is based on the identity of the dissolved particles and the solvent. It includes viscosity, surface tension and solubility.

Thus, the correct answer is option A.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

On which surface of cell, Donnan equilibrium occurs

  1. Cell wall

  2. Plasma membrane

  3. Transport

  4. Nuclear membrane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Donnan equilibrium is the equilibrium reached between two ionic solutions separated by a semipermeable membrane when one or more of the kinds of ion cannot pass through the membrane. The result is a difference in osmotic pressure and electrical potential between the solution.
So the correct answer is 'Plasma membrane'.
Multiple choice biology transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

According to fluid mosaic model (proposed by Singer and Nicolson), plasma membrane is composed of 

  1. Cellulose, hemicellulose

  2. Phospholipid and integrated protein

  3. Phospholipid, extrinsic protein, intrinsic protein

  4. Phospholipid and hemicellulose
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
According to fluid mosaic model, plasma membranes are quasifluidic structures with a viscous lipid bilayer made up of phospholipids having proteins at places distributed as mosaic both on the surface and inside. Singer and Nicolson have described cell membrane as protein icebergs floating in sea of lipids. External proteins are called extrinsic proteins or peripheral proteins while the internal proteins are named intrinsic or integral.
So, the correct answer is 'Phospholipid, extrinsic protein, intrinsic protein'.
Multiple choice biology transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

The cell membrane engulfs its food by a process called as 

  1. Exocytosis

  2. Endocytosis

  3. Osmosis

  4. Diffusion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Endocytosis is the process in which cells absorb molecules by engulfing them. The cell membrane engulfs food and other materials by endocytosis. The plasma membrane creates a small deformation inward, called as an invagination, in which the substance to be transported is captured. The deformation then pinches off from the membrane on the inside of the cell, creating a vesicle containing the captured substance. Endocytosis is a pathway for internalizing solid particles, small molecules and ions and macromolecules. Endocytosis requires energy and is thus, a form of active transport.

Thus, the correct answer is 'Endocytosis'.

Multiple choice botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

Water uptake in Imbibition takes place through ________

  1. Absorption

  2. Adsorption

  3. Sorption

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Imbibition is a special type of diffusion when water is absorbed by solids- colloids causing an enormous increase in volume. Examples include the absorption of water by seeds and dry wood.

Multiple choice botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

Imbibition occurs due to?

  1. Increase in volume of imbibate

  2. Adsorption of imbibate by imbibant

  3. Absorption of imbibant by imbibate

  4. Loss of energy in the form of heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Imbibition is a special type of diffusion when water is absorbed by solids and colloids causing an enormous increase in volume. The substance that imbibes water is called imbibant, and the liquid which is imbibed is called imbibate. Imbibition occurs due to the increase in the volume of imbibate.

 Hence, the correct answer is option A.