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प्रश्न
What is Active transport?
उत्तर
Active transport is the passage of a substance (salt or ion) from its lower to higher concentration through a living cell membrane using energy from the cell. Active transport is in a direction opposite to that of diffusion. Certain nutrients, such as ions of nitrates, sulphates, potassium, zinc, manganese, etc., cannot pass through the cell membrane of the root cells easily. This is because their concentration is higher inside the root cells, and it is so maintained in order to develop osmotic pressure for absorbing water.
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संबंधित प्रश्न
Describe the role played by protein pumps during active transport in plants.
Name the following :
The wax-like layer on the epidermis of leaves which reduces transpiration.
Lenticels or stomata (Which one remains open always ?)
Name the plant tissue which helps in carrying the food to different parts of a plant.
Differentiate between the following
Active transport and Passive transport.
Active transport involves ______
In a passive transport across a membrane, when two different molecules move in opposite direction and independent of each other, it is called as ______.
The process for which energy is required is ______.
Active transport is one in which the ions outside the roots move in by utilising ______.
Three cylinders of potato were carefully dried on blotting paper and weighed. Each piece weighed 3 grams. Each one was placed in the beaker as shown below:
Answer the following questions:
- After 48 hours, which potato cylinder would be the heaviest?
- The movement of which substance is mainly responsible for the weight change in the potato cylinders?
- Name and define the process which is responsible for the movement of the substance mentioned in answer (b).
- Write specific names of the processes which occur in beakers B and C. [kinds of processes defined in answer (c)].
- Would there be any difference in the weight of the potato cylinder in beaker A after 48 hours? Give reason.
