Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

When a plant cell is placed in a solution which is hypotonic to the cell sap, which of the following conditions will not apply

  1. The water potential of the cell sap will rise

  2. The suction pressure of the cell sap will fail

  3. The cell will become turgid

  4. The wall pressure of the cell will fail
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If a cell is placed in hypotonic solution, water start moving into the cell by the process of endosmosis and cell become turgid.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

All the following involve osmosis except.

  1. Movement of water from soil to root

  2. Movement of water from root hair to endodermis and pericycle

  3. Movement of water between xylem elements

  4. Movement of water form xylem to mesophyll cell of leaves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Similar to the previous question, movement of water between xylem elements is bulk flow, not osmosis.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Consider the following events involved in stomatal opening:
1. Turgor pressure of guard cells increases
2. $K^+$ ions move into guard cells
3. pH of guard cells decreases
4. Water moves into guard cells
What is the correct sequence of these events leading to stomatal opening:

  1. 2-4-3-1

  2. 3-2-4-1

  3. 2-3-4-1

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

The sequence is: K+ ions move into guard cells (2), which lowers the water potential, causing water to move in (4), which increases the turgor pressure (1). The pH change (3) is associated with the K+ transport.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Choose the correct answers from the alternatives given :
The osmotic pressure of pure water is

  1. 0

  2. 0.1

  3. 1

  4. 10
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Osmotic pressure is the minimum pressure applied to prevent the inward flow of solvent molecules from a dilute solution into the concentrated solution, where both solutions are separated by a semipermeable membrane. 

The osmotic pressure would be zero if pure water were on both sides of the semi-permeable membrane. 

So the correct answer is "0"

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Active transport from outside to inside of molecule across a membrane requires

  1. Cyclic AMP

  2. Acetyl chlorine

  3. ATP

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

Active transport from outside to the inside of molecules across a membrane requires ATP. It is required in transferring solutes across the membrane may be through an ATPase which creates ph gradient across the membrane. Thus, the correct option is C.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

ATP molecules combine with carrier molecules and allow passage of substances.

  1. Along concentration gradient

  2. Against concentration gradient

  3. Both A and B

  4. ATP is not required
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the active transport, there is a movement of some substance from low concentration to the high concentration i.e., against the concentration gradient wit the help of ATP combined with carrier molecules.

Thus, the correct answer is option B.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Glucose and amino acids are absorbed in the intestine by

  1. Active transport

  2. Passive transport

  3. Selective absorption

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

Glucose and amino acids are absorbed against their concentration gradients in the small intestine. This process requires energy in the form of ATP, which characterizes active transport.