NEET BIOLOGY

PLANT PHYSIOLOGY

TRANSPORT IN PLANT

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
True or false:Phloem is living and the sugar is transported down in the stem
A
True
B
False
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -In vascular plants, phloem is the living tissue that carries organic nutrients (known as photosynthate ), particularly sucrose; a sugar, to all parts of the plant. The phloem is concerned mainly with the transport of soluble organic material made during photosynthesis. Therefore, the correct answer is option A.

Detailed explanation-2: -The photosynthates from the source are usually translocated to the nearest sink through the phloem sieve tube elements. For example, the highest leaves will send sugars upward to the growing shoot tip, whereas lower leaves will direct sugars downward to the roots.

Detailed explanation-3: -Any change in pressure at one end of the transport vessel will result in an equal change in pressure at the other end of the transport vessel. This allows phloem sap to move up or down, with or against gravity, as it moves from source to sink. State that sucrose is the most prevalent solute in phloem sap.

Detailed explanation-4: -It is a living tissue, which is responsible for transporting food and other organic materials. Xylem generally consists of dead cells (parenchyma is the only living cell present in the xylem).

Detailed explanation-5: -These compounds are transported by the phloem tissue, which allows them to go both up and down within the plant, unlike sap which moves through the xylem. Phloem cells are tailored to perform certain functions: Sieve tubes lack a nucleus and are designed for transfer.

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