Transport of molecules - class-XII
Description: transport of molecules | |
Number of Questions: 64 | |
Created by: Saurabh Mittal | |
Tags: the fundamental unit of life biology cell and cell organelles cell - basic unit of life movement in and out of the cell transport in plants plant water relation |
If two solution have the same osmolarity, they are said to be
The space between the plasma membrane and the cell wall of a plasmolyzed cell surrounded by a hypertonic solution is occupied by the
All the following involves osmosis except.
At the time of opening of stomata, pH of guard cells in comparison to pH of subsidiary cells, is?
Two cells A and B are contiguous. Cell A has osmotic pressure $10$atm, turgor pressure $1$ atm and diffusion pressure deficit $3$ atm. Cell B has osmotic pressure $8$ atm, turgor pressure $3$ atm and diffusion pressure deficit $5$ atm. The result will be?
When a plant cell is placed in a solution which is hypotonic to the cell sap, which of the following conditions will not apply
Ephemerals are drought ___________.
All the following involve osmosis except.
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:
Choose the correct answers from the alternatives given :
The osmotic pressure of pure water is
Active transport from outside to inside of molecule across a membrane requires
ATP molecules combine with carrier molecules and allow passage of substances.
All mineral salts absorbed in cells are
Glucose and amino acids are absorbed in the intestine by
In which one of the following, expenditure of energy is required?
Which of the following means of transmembrane transport involves the expenditure of energy by the cell and can move materials up a concentration gradient?
Decreasing order concentration of minerals inside cell is
Choose the correct answer from the alternatives given.
Active transport
Energy is required for
Choose the correct answer from the alternatives given.
Which of the following processes requires the greatest expenditure of energy by the cell?
Substances like glucose, amino acids, Na$^+$ etc in filtrate are reabsorbed by
ions are absorbed from the soil by
${ Na+K }^{ + }$ pump represents
The movement of a molecule across a typical plant cell about 50mm takes aproximately
What happens when wilted vegetable are dipped in water _________________.
Which one of the following is the correct statement for an active sodium-potassium ATPase ?
The absorption of water due to expenditure of energy is called as ____________.
Active transport
Carrier protein helps in
Active transport across cell membrane requires
Movement of ions r molecules against electrochemical gradient is called ______________.
Active absorption is affected by:
Active transport involves the transport of molecules across a cell membrane.
In order to establish and maintain a concentration gradient, which of the following condition is suitable?
In the light of carrier concept, the transport of ion across the membrane against concentration gradient is
Carrier proteins are involved in the
Active transport across biomembrane involves
Minerals are absorbed by the plants, through
$Na^+ / K^+$ pump in a cell is an example of
Active transport of ions by a cell requires
Which is not true of active transport
Active transport is characterised by
It is not characteristic of active transport
The energy is required in absorption of water by
Glucose and amino acids are absorbed in intestine by
Movement of materials against concentration gradient is achieved by
State whether the following statements are true or false.
Carrier proteins are necessary for active transport to occur.
Choose the correct answer from the alternatives given.
The sodium potassium pump moves sodium and potassium ions across the plasma membrane by
State whether the following statements are true or false.
ATP is required for active transport.
State whether the following statements are true or false.
In the sodium-potassium pump, sodium is transported out of the cell and potassium is trapsported into the cell as ATP is broken by a membrane protein.
Which one of the following processes requires an input of energy?
State whether the following statements are true or false.
The movement of ions or molecules against a concentration gradient with the utilisation of energy is known as active transport.
Choose the correct answer from the alternatives given.
Which is the best definition of active transport?
Which of the following is an energy dependent process?
Uphill transport i.e., movement of substances from their lower concentration to their higher concentration occurs in
Channel proteins allow ions that would not normally pass through the cell membrane to go through the channel. What properties of the proteins are responsible for this?
The movement of ions against the concentration gradient is
Osmotic theory for an active absorption of water was given by
Carrier ions like Na$^+$ facilitate the absorption of substances like
A student put five raisins each in two beakers A and B. Beaker A contained 50 ml of distilled water and beaker B had 50 ml of saturated sugar solution. After sometime, the student would observe that
Transporting pull arise mainly from
Which of the following does not operate in the carrier concept of active absorption of minerals?
Mineral absorption is mostly
Which one is not connected with transport across the cell membrane?