Short distance transport - class-XII
Description: short distance transport | |
Number of Questions: 45 | |
Created by: Vijay Palan | |
Tags: energy and respiration transport in plants water absorption and ascent of sap in plants cell membrane absorption by roots - the processes involved plant water relation biology plant physiology botany bio-chemistry |
Choose the correct answer from the alternatives given.
If a cell is placed in an isotonic solution, what will occur?
During phloem transportation sugar is moved in form of sucrose in to the companion cells and them into the living phloem sieve tube cells by -
A root concentrates minerals by?
Percentage of water left in the soil when a plant begins to wilt is known as
Absorption of mineral elements from the soil occurs through
In trees, death of protoplasts is essential for vital function such as
Nobel prize in 1991 for discovering the single ion channels in cell was awarded to
The process by which minerals get absorbed is
Which statement is incorrect for ion-channels?
ATP is required for
Which of the following shows that metabolic energy is required in the absorption of ions
Difference between active and passive modes of membrane transport is
Active transport of solutes in a living system is?
Choose the correct answer from the alternatives given.
Active transport from outside to inside of molecules across a membrane requires:
Sucrose moves into sieve tube elements by?
Select the odd one our w.r.t. porins.
Facilitated diffusion can be differentiated from active transport except
The process of facilitated diffusion is different from active transport due to
Facilitated diffusion can not cause net transport of molecules from a low to a high concentration because -
The physical process involved in the release of molecular oxygen from leaves is
................ is the change in the value of a quantity with change in another variable.
Which of the following prevents an ion to cross the plasma membrane via simple diffusion?
If the amount of an ion absorbed by a root hair cell at $0^{0}C$ is 5 gm and at $20^{0}C$ is 20 gm. The amount of this ion absorbed actively should be
Which of these is/are not a property of facilitated transport?
(a) Requires special membrane proteins
(b) Highly selective
(c) Uphill transport
(d) Requires ATP energy
Which does not pertain to facilitated transport?
Choose the correct statement regarding facilitated diffusion:
Which of the following is not true of the carrier molecules involved in facilitated diffusion?
Which of the following have no effect at rate of facilitated diffusion?
Facilitated diffusion
Select the incorrect statement regarding facilitated diffusion.
In apoplast pathway, water moves exclusively through the
When transport proteins simultaneously move two molecules across a membrane in the same direction, the process is called
The type of diffusion in which substance move across the membrane along their concentration gradient in the presence of certain or transport proteins is called as
Which of the below mentioned properties is not true with respect to facilitated transport?
When a molecule moves across a membrane independent of other molecules, the process is called (i) Uniport (ii) Symport (iii) Antiport?
When a molecule moves across a membrane independent of other molecules, the process is called
In the resting state of the neutral membrane, diffusion due to concentration gradients, if allowed, would drive.
Which one of the following processes accounts for the accumulation of some ions inside the vacuole of the cell at a higher concentration than in the surrounding medium?
Diffusion in gases are _____ than in liquids.
Choose the correct answers from the alternatives given.
Which one of the following does not increase the rate of diffusion?
The process of diffusion is involved in _____________.
In plants diffussion occurs in
A plant cell was put into a solution of substance A at a concentration of $200\ mmol/L$. The rate of uptake into the cell was measured as $5\ mmol/minute$. When the cell was placed in a solution of substance A at a concentration of $400\ mmol/L$, the rate of uptake was $10\ mmol\ per\ minute$. When the experiment was repeated with substance B, the rate of uptake was $10\ mmol\ per\ minute$ at both concentrations of the substance. Which of the following provides the best explanation of the results?
Which of the following is zero in fully turgid cell?
Choose the correct answers from the alternatives given.
In a fully turgid cell, which one of the following would be zero?