AP BIOLOGY

PLANTS

TRANSPORT IN PLANTS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following does NOT form a xylem tissue?
A
Xylem vessel
B
Tracheid
C
Fibre
D
Sieve plate
E
Parencyma
Explanation: 

Detailed explanation-1: -The correct answer is sieve tubes . Concepts: The xylem and phloem are the vascular tissues in plants.

Detailed explanation-2: -So, the correct answer is ‘Medullary rays.

Detailed explanation-3: -Xylem vessels are dead cells, phloem vessels are living cells (sieve tube elements) supported by companion cells. Xylem vessels are for both transport and support, phloem vessels are just for transport. Xylem vessels have no end walls, phloem vessels have end walls called sieve plates which allow substances through.

Detailed explanation-4: -Explanation: SIEVE TUBES is not found on xylem tissue. Xylem is water conducting part. It has tracheids, vessels, xylem parenchyma and xylem fibres.

Detailed explanation-5: -Sieve tubes and companion cells are components of xylem tissue.

There is 1 question to complete.