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

Which of the following means of transmembrane transport involves the expenditure of energy by the cell and can move materials up a concentration gradient?

  1. Osmosis

  2. Facilitated diffusion

  3. Simple diffusion

  4. Active transport
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
In one form of transport across the cell membrane, ATP is utilized. The utilization of an ATP molecule provides the cell with an energy boost which enables the transport of different molecules across the cell membrane. This is termed as active transport of molecules across the cell membrane.
So, the correct answer is 'Active transport'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Decreasing order concentration of minerals inside cell is

  1. Ca$^{+2}$$-$K$^+$$-$Na$^+$.
  2. K$^+$$-$Ca$^{+2}$$-$Na$^+$.
  3. K$^+$$-$Na$^+$$-$Ca$^{+2}$.
  4. Na$^+$$-$K$^+$$-$Ca$^{+2}$.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Potassium ions are usually higher inside the cell than outside the cell, and its concentration inside the cell is about 10 to 30 fold higher than the other components, while sodium ion is higher outside the cell than inside the cell. 
So, the answer is C.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Choose the correct answer from the alternatives given.
Active transport

  1. Requires an input of ATP

  2. Is involved in diffusion

  3. Occurs in osmosis and facilitated transport

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In one form of transport across the cell membrane, ATP is utilized. The utilization of an ATP molecule provides the cell with an energy boost which enables the transport of different molecules across the cell membrane. This is termed as active transport of molecules across the cell membrane.

So, the correct answer is 'Requires an input of ATP'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Energy is required for

  1. Active transport

  2. Facilitated transport

  3. Diffusion

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In one form of transport across the cell membrane, called active transport, ATP is utilized. The utilization of an ATP molecule provides the cell with an energy boost which enables the transport of different molecules across the cell membrane.
So, the correct answer is 'Active transport'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Choose the correct answer from the alternatives given.
Which of the following processes requires the greatest expenditure of energy by the cell?

  1. Facilitated diffusion

  2. Diffusion

  3. Active transport

  4. Osmosis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In one form of transport across the cell membrane, ATP is utilized. The utilization of an ATP molecule provides the cell with an energy boost which enables the transport of different molecules across the cell membrane. This is termed as active transport of molecules across the cell membrane.

So, the correct answer is 'Active transport'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Substances like glucose, amino acids, Na$^+$ etc in filtrate are reabsorbed by

  1. Passive transport

  2. Active transport

  3. Both active and passive transport

  4. Facilitated diffusion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In cellular biology, active transport is the movement of molecules across a membrane from a region of their lower concentration to a region of their higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport: primary active transport that uses ATP, and secondary active transport that uses an electrochemical gradient. An example of active transport in human physiology is the uptake of glucose in the intestines. So substances like glucose, amino acids, sodium ions in filtrate are reabsorbed by active transport.


So the correct option is 'Active Transport'.

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

ions are absorbed from the soil by

  1. Passive transport

  2. Active transport

  3. Both (1) & (2)

  4. Imbibition
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Minerals are absorbed from the soil in the form of ions. Absorption of minerals and water are two different processes but the  pathway is same. Mineral ions cannot be absorbed by osmosis or diffusion because the concentration is low. So the root hair cells have carrier molecules on their surface which pick the ions and move against the concentration gradient. Since the movement is against the concentration gradient then ATP will be required. So The absorption of ion is a Active process. 


So, the correct answer is 'Active transport'.

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

${ Na+K }^{ + }$ pump represents

  1. Active transport

  2. Passive transport

  3. Osmosis

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

The sodium-potassium pump is a specialized mechanism to transport proteins using energy. The process of moving sodium and potassium ions across the cell membrane is an active transport as it involves the hydrolysis of ATP. The hydrolysis of ATP molecule provides the necessary energy for the transport of molecules across the membrane. The action involves an enzyme known as Na+/K+-ATPase.

So, the correct answer is 'Active transport'.

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

The movement of a molecule across a typical plant cell about 50mm takes aproximately

  1. 2.5m

  2. 2.5 h

  3. 2.5s

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lines of stomates (shown by the orange colour of the guard cells) lie along the flanks describe the status and movement of water in plants, soil and the atmosphere. This internal hydrostatic pressure (also called turgor pressure) is typically 0.5 away from the cell wall, and solution with small molecular weight solutes. 

So, the correct option is "D" (None of these).

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

What happens when wilted vegetable are dipped in water _________________.

  1. They regain their size

  2. Remain to be same

  3. Colour will change

  4. Decrease in size because of lose of water.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • After dipping into water wilted vegetable regain their size, as water travells through a network of veins through out the plant and cell are hydrated and refirm their size. by a process called osmosis .
  • Leaves turn yellow or red when they falls , in fallpalnt breakdown and reabsorb chlorophyll, letting the colours of other pigments show through , hence colour changes.
  • When vegitables are wilted due to  dehydration, their size decreases due to loss of water.
 So the correct answer is " They regain their size".