Assertion :- Initial uptake of ions is rapid while second phase of uptake is slow.
Reason:- Initial uptake is carried out by apoplastic path while second phase of uptake is carried out by symplast.

Initial phase of ion uptake

Initial phase of ion uptake

Assertion : Water and mineral uptake by root hairs from the soil occurs through apoplast until it reaches edodermis. Reason : Mature sieve tubes have parietal cytoplasm and perforated sieve plates.

Assertion : Rapid cooling is carried out during cryopreservation of seeds . Reason : Seeds possess a lot of moisture .

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : In electric circuits, wires carrying currents in opposite directions are often twisted together. Reason : If the wires are not twisted together, the combination of wires forms a current loop, the magnetic field generated by the loop, might affect adjecent circuits or components.

In mineral absorption , (i) There is rapid uptake of ions into free space in its first phase. (ii) Initial uptake of mineral is passive (iii) Entry or exit of ions to and from inner space does not require energy.

In mineral absorption , (i) There is rapid uptake of ions into free space in its first phase. (ii) Initial uptake of mineral is passive (iii) Entry or exit of ions to and from inner space does not require energy.

Assertion : Water and mineral uptake by root hairs from the soil occure through apoplast until it reaches endodermis Reason : Casparian strips in endodermis are suberized.

Assertion : Water and mineral uptake by root hairs from the soil occur through apoplast until it reaches endodermis Reason : Casparian strips in endodermis are suberized.