Active transport is the one in which the ions outside the roots move in with expenditure of energy................

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Solution

Active transport is the one in which the ions outside the roots move in with expenditure of energy from the region of their lower concentration outside to the region of their higher concentration inside.

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Complete the following statements:

(a) Hypotonic solution is one in which the solution kept outside the cell has a lower solute concentration than .............................. the cell.

(b) Active transport is one in which the ions outside the roots move in with expenditure of energy ..............................

(c) The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of ..............................

Q. Assertion :Most minerals must enter the root by active absorption into the cytoplasm of epidermal cells. Reason: This transportation needs energy in the form of ATP. Some ions also move into the epidermal cells passively.

Q. The pressure developed in the root xylem due to entry of water followed by the active transportation of mineral ions is called -

Q. 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.

Q. Find the correct pair of statements :
(i) The influx of Cl into guard cells during stomatal opening is active.
(ii) Entry of sucrose from companion cells into sieve tubes at source involves the expenditure of energy.
(iii) At the sinks, sucrose moves out of phloem by passive transport.
(iv) Efflux of K

^{+}

from guard cells during stomatal closure does not involve energy expenditure.

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