Tag: theories of translocation

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Questions Related to theories of translocation

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'.