Tag: diffusion

Quizzes (2) Questions (66)

Questions Related to diffusion

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Choose the correct answer from the alternatives given.
By what method arc ions absorbed by plants?

  1. Along DPD gradient

  2. By molecular diffusion

  3. By carriers and pumps

  4. Along water potential gradients
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 For plants to take up mineral ions, ions are moved into root hairs, where they are in a higher concentration than in the dilute solutions in the soil. Active transport (pumps) then occurs across the root so that the plant takes in the ions it needs from the soil around it. The root hair cells have carrier molecules on their surface that pick up the minerals and move them into the cell against the concentration gradient.

So, the correct option is, 'By carriers and pumps'.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

The direction of water in Cycas leaflets is 

  1. Upward

  2. Downward

  3. Lateral

  4. Both A and B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(A) The upward flow of the water is seen in the roots of the plant.

(B) Downward flow is seen in the bulk transportation from leaf to every other part of the plant.
(C) Lateral flow of water is seen in leaf and roots due to the diffusion patterns.
So. the correct answer is 'Lateral'

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Choose the correct answer from the alternatives given.
Minerals are absorbed in:

  1. meristematic zone

  2. root hair zone

  3. elongation zone

  4. root cap zone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants absorb their mineral salt supply from the soil through the roots from the zones of elongation and root hair. The minerals are absorbed as ions which are accumulated by the plants against their concentration in the soil.

So, the correct option is, 'Elongation zone'.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Choose the correct answers from the alternatives given.
The energy source that drives the upward flow of water is

  1. Light

  2. Glucose

  3. ATP

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

Solar heat causes the evaporation of water from the surface of the leaves in form of water vapour through small openings called stomata. This loss is known as transpiration. Due to the loss of water, water stress condition is created that forces the upward movement of water from the soil towards the shoot system. This water is then again distributed to various plant parts.

Hence, the correct answer is 'Solar heat'.

Multiple choice bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

Choose the best definition for 'diffusion' from the following.

  1. Passive movement from an area of greater concentration to one of lesser concentration

  2. Active movement from an area of greater concentration to one of lesser concentration

  3. Passive movement from an area of lesser concentration to one of greater concentration

  4. Active movement from an area of lesser concentration to one of greater concentration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diffusion is a type of passive transport which do not require expenditure of cellular energy for the net movement of a substance from a region of high solute concentration to a region of low solute concentration. This is also referred to as the movement of a substance down a concentration gradient.

Multiple choice bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

Different substances move independently depending on their own concentration gradients in?

  1. Simple diffusion

  2. Bulk flow

  3. Osmosis

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

Diffusion is a passive movement of molecules along their concentration gradient. While osmosis is the diffusion of water molecules through a differentially permeable membrane or semipermeable membrane.


So the correct option is "Simple diffusion". 

Multiple choice bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

Diffusion pressure is directly proportional to:

  1. Concentration of molecules diffusing

  2. Kinetic energy of diffusing molecule

  3. Concentration gradient

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

The same conditions of temperature and pressure, the molar mass is proportional to the mass density. Therefore, the rate of diffusion of different gases is inversely proportional to the square root of their mass densities.

So, the correct option is 'Concentration of molecules diffusing'.

Multiple choice bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

Rate of diffusion of $CO _2$ is $20$ times higher than $O _2$, as it depends upon?

  1. Solubility of gases

  2. Partial pressure

  3. Thickness of membrane

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gas exchange is the process that occurs between oxygen and carbon dioxide. Oxygen is passed from the lungs to the bloodstream and carbon dioxide is eliminated from the bloodstream to the lungs. Exchange of Gas takes place in lungs between the alveoli and capillaries which are tiny blood vessels, placed at the walls of alveoli. The rate of diffusion depends on the thickness of the biological membrane which forms the boundary between the external environment and organisms.

Gas exchange takes place by simple diffusion based on a concentration/pressure gradient. The rate of diffusion depends not only on the solubility of gases but also on the thickness of the membranes involved in gas exchange.
So the correct answer is 'All of these'.

Multiple choice bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

Movement of gases across plasma membrane occurs through ______________

  1. Osmosis

  2. Diffusion

  3. Imbibition

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diffusion is a process in which the gaseous molecules spreads due to their kinetic energy and movement of molecules from their higher concentration to their lower concentration. Hence, The correct answer is option B.

Multiple choice bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

A bottle of perfume is opened in the room opposite to you and within minutes you begin to smell the perfume. This phenomenon is a classic example of

  1. Dialysis

  2. Osmosis

  3. Active transport

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

Diffusion is the process of spreading of the gaseous molecule according to their kinetic energy. In this process, particles move from an area of high concentration to an area of low concentration. If the perfume is sprayed in one corner of a room, it will be smelt soon after in the opposite corner. Since the perfume molecules are in constant random motion they bump into each other causing some molecules to be occasionally sent hurtling out of the mass. Gradually, the molecules spread out.