Tag: transport in the phloem of plants

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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 plant transport in the phloem of plants vascular tissue permanent tissue

Which of the following is a food synthesising tissue?

  1. Phloem

  2. Sclerenchyma

  3. Chlorenchyma

  4. Aerenchyma
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Phloem is also called as bast. 
  • These tissues in plants conduct foods made in the leaves to all other parts of the plant. 
  • Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibers, and phloem parenchyma cells.
  • Hence, Phloem is a food synthesizing tissue.

So, the correct answer is 'Phloem'.

Multiple choice biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

The movement of molecules in phloem is

  1. Unidirectional.

  2. Bidirectional.

  3. Non-directional.

  4. Sometimes unidirectional and sometimes bidirectional.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Phloem is responsible for transport of food and minerals. Food synthesized in photosynthetic parts is translocated to nonphotosynthetic parts through the phloem. Phloem translocates organic substances and inorganic solutes first from leaves to all other parts of the plant and storage organs. Storage organs re-export organic nutrients to those parts which require the same as newly formed leaves and fruits i.e., it is bidirectional.

Thus, the correct answer is option B.

Multiple choice biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

In plants, water is transported through

  1. Xylem

  2. Phloem

  3. Stomata

  4. Root hair
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Xylem functions as a conducting tissue for water and minerals from roots to the stem and leaves.
  • It also provides mechanical strength to the plant parts. It is composed of four different kinds of elements, namely, tracheids, vessels, xylem fibres, and xylem parenchyma.
  • Hence In plants, water is transported through Xylem.
  • So, the correct answer is 'Xylem'.
Multiple choice biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

The number of division with the plants having vascular

  1. $4$
  2. $2$
  3. $1$
  4. $3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vascular plants (Tracheophyta) are typically classified into four main divisions: Pteridophyta, Gymnospermae, Angiospermae, and sometimes Bryophyta are excluded, but in standard botanical classification, the vascular groups are Pteridophytes, Gymnosperms, and Angiosperms (often split into Monocots/Dicots). The question likely refers to the four major groups: Psilophyta, Lycophyta, Sphenophyta, and Pterophyta.