Tag: transport of food, water and minerals

Questions Related to transport of food, water and minerals

The theory explaining passive absorption of mineral salts is :

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

  1. Ion exchange

  2. Carrier Concept

  3. Cytochrome pump theory

  4. None of the above.

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Correct Option: A

The ions are .......... absorbed to the surface of root cells.

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

  1. Electrostatically

  2. Electromagnetically

  3. Osmotically

  4. None of the above

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Correct Option: A
Explanation:

Plant root cells contain relatively large quantities of organic cations and anions that do not diffuse through cell membranes. These organic ions could act as non-diffusible ions and may bind inorganic ions by electrostatic attraction. Thus ions are absorbed to the surface of roots electrostatically.

Thus, the correct answer is option A.

Transparent hairs on catkins and caterpillars function to ____________.

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

  1. Trap heat

  2. Trap moisture

  3. Reflect light

  4. Drink water

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Correct Option: B

Contact exchange of ions occurs.

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

  1. Between root and soil particles

  2. Root and coil solution

  3. Cell and external solution

  4. All the above

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Correct Option: A

A characteristic based on concentration of particles in solution is

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

  1. Colligative property

  2. Surface tension

  3. Colloidal nature

  4. All the above

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Correct Option: A
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.

Contact exchange theory was put forward by :

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

  1. Jenny and Overstreet

  2. Hylmo and Kramer

  3. Bennet and Clark

  4. De Vries and Curtis

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Correct Option: A

Most hebaxeous plants have how much dry weight of its total fresh weight?

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

  1. 92%

  2. 10-15%

  3. 50%

  4. 29%

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Correct Option: A

On which surface of cell, Donnan equilibrium occurs

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

  1. Cell wall

  2. Plasma membrane

  3. Transport

  4. Nuclear membrane

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Correct Option: B
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'.