Assertion: Movement of materials inside phloem is bidirectional i.e. it can be both upwards or downwards. Reason: Movement of molecules inside xylem is unidirectional i.e. always upwards.

Question

Assertion: Movement of materials inside phloem is bidirectional i.e. it can be both upwards or downwards. Reason: Movement of molecules inside xylem is unidirectional i.e. always upwards. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

Long distance bulk movement of substances that occurs through conducting or vascular tissues of plants is called translocation. There are two vascular tissues, xylem and phloem. Xylem translocation is mainly from roots to aerial parts. It passes water with mineral salts, some organic nitrogen and hormones i.e. unidirectional. Phloem translocates organic substances and inorganic solutes first from leaves to all other parts of the plant and storage organs. Storage organs re-export organic nutrients to those parts which require the same as newly formed leaves and fruits i.e. it is bidirectional.

Q. Assertion: Movement of materials inside phloem is bidirectional i.e. it can be both upwards or downwards. Reason: Movement of molecules inside xylem is unidirectional i.e. always upwards.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Q. Assertion: Movement of materials inside phloem is bidirectional i.e. it can be both upwards or downwards.
Reason: Movement of molecules inside xylem is unidirectional i.e. always upwards.