Question

Choose the incorrect statements of the following: A) Parenchyma constitute major components of plant organs B) The anatomy of seed plants was published by Easu C) Protophloem will have broader sieve tubes D) Sieve tube functions are controlled by its nucleus

• A. A, B
• B. C, D
• C. A, D
• D. B, D

Hint:

Mature sieve tubes are enucleated to facilitate efficient conduction; companion cells act as their "life support".

Answer 1

The Correct Option is B

Step 1: Understand the question.
We must find the two statements that are incorrect about plant tissues and phloem.

Step 2: Test statement A.
Parenchyma is a simple tissue that makes up a large part of soft plant organs like leaves and fruits. This is true, so A is correct.

Step 3: Test statement B.
The well-known book on the anatomy of seed plants was written by Esau. This is true, so B is correct.

Step 4: Test statement C.
Protophloem is the first-formed phloem and it has narrow sieve tubes, not broad ones. So C is incorrect.

Step 5: Test statement D.
A mature sieve tube loses its nucleus, so its work is controlled by the neighbouring companion cell, not its own nucleus. So D is incorrect.

Step 6: Choose the incorrect pair.
The incorrect statements are C and D, so that pair is the answer.
\[ \boxed{\text{C, D}} \]