Tag: plant physiology

Quizzes (19) Questions (44)

Questions Related to plant physiology

Multiple choice botany plant physiology mineral absorption transport of food, water and minerals mineral transport theories of translocation transport in the phloem of plants

Which of the following is related with transfer of food material?

  1. Xylem

  2. Collenchyma

  3. Phloem

  4. Parenchyma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Xylem tissue is comprised of dead cells involved in the process of transport of water and minerals. Transport of water is under the influence of transpiration pull and is a physical process. 

Phloem tissue is comprised of living cells involved in the process of translocation of sugars. Translocation of sugars requires living cells and is a physiological process. The sugars are transported under the influence of pressure difference between source and sink, which leads to mass flow.

Multiple choice botany plant physiology mineral absorption transport of food, water and minerals mineral transport theories of translocation transport in the phloem of plants

Leaf photosynthates are transported to other parts of higher plants through

  1. Cambium

  2. Pith

  3. Xylem

  4. Phloem
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phloem is involved in transport of sugars. Phloem cells are living cells, which carry out the physiological process of sugar transport in higher plants.

Multiple choice botany plant physiology mineral absorption transport of food, water and minerals mineral transport theories of translocation transport in the phloem of plants

By many evidences, it can be known that the downward movement of food takes place through

  1. Phloem

  2. Xylem

  3. Collenchyma

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

Movement of food takes place through phloem tissue. This can be demonstrated through ringing experiment in which, if ring of vascular tissue including phloem is removed in a dicot tree. The plant parts located below the point of ringing will die because these parts do not get food.

Thus, the correct answer is option A.

Multiple choice botany plant physiology mineral absorption transport of food, water and minerals mineral transport theories of translocation transport in the phloem of plants

How many of the following features are related to Dixon and Jolly model of water transport in plants?
a. Cohesion between water molecules
b. Transpiration pull
c. Pushing of water by negative root pressure
d. Surface tension
e. Pushing of water by positive root pressure.

  1. $4$
  2. $5$
  3. $2$
  4. $3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Dixon and Jolly model (Cohesion-Tension theory) relies on cohesion, adhesion, surface tension, and transpiration pull. Pushing by root pressure is not part of this specific model.

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

Select the odd one our w.r.t. porins.

  1. Not associated with the inner membrane of plastids

  2. Associated with the outer membrane of mitochondria

  3. Found in outer membrane of gram positive bacteria

  4. Allow movement of low molecular weight hydrophilic substances
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Porins are beta barrel proteins that cross a cellular membrane and act as a pore, through which molecules can diffuse. Unlike other membrane transport proteins, porins are large enough to allow passive diffusion, i.e., they act as channels that are specific to different types of molecules. Porins from non-green plastids and from the outer mitochondrial membrane were re- constituted into planar lipid bi-layers. The proteins showed high pore-forming activities and similar single- channel conductance. So, the correct option is "Not associated with the inner membrane of plastids".

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

Facilitated diffusion can be differentiated from active transport except

  1. Energy does not required

  2. Show saturation effect

  3. Accumulation of molecule

  4. (1) and (3) both
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In facilitated diffusion ,special proteins help move substances across membranes without expenditure of  ATP energy. While in case of Active transport it uses energy to pump molecules against a concentration gradient .

In both case , transportation rate reaches a maximum when all of the protein transporters are being used (saturation).
So the correct option is 'One and three both' .

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

The process of facilitated diffusion is different from active transport due to

  1. Involvement of membrane protein

  2. Its response to protein inhibitors

  3. Being a downhill process

  4. Saturation of transport
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Facilitated diffusion and active transport both involve membrane proteins and exhibit saturation kinetics, but facilitated diffusion moves molecules down their concentration gradient without cellular energy expenditure, making it a downhill process.

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

The physical process involved in the release of molecular oxygen from leaves is

  1. Diffusion

  2. Transpiration

  3. Osmosis

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

Diffusion is a slow process and is not dependent on a living system. Diffusion is very important to plants since it the only means for gaseous movement within the plant body. Intake of carbon dioxide and release of oxygen through stomata occurs through the process of diffusion. Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.