Question

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is?

• A. maturing
• B. differentiating
• C. widening
• D. elongating

Answer 1

The correct option is A

maturing

The correct option is A.

Explanation of the correct option:

1. Maturity of the root or stem is the development of the parts so that the plant can easily become a tree.
2. This is the time when protoxylem develops or produces annular and spiral thick carrier elements.
3. They also grow plants to provide mechanical support.

Explanation of the incorrect option:

Option B:

1. The extension of the root or stem can be defined as that long.
2. They have nothing to do with their width.
3. No annular or spiral thick elements are developing.

Option C:

1. Expansion of roots or stems can be defined as the time when they become wider.
2. They relate to width but not to root and stem length.
3. No annular or spiral thick elements are developing.

Option D:

1. Variation can be defined as the time of plant growth or transformation.
2. These plants usually transform into new plants to enhance their species
3. No annular or spiral thick elements are developing.

Final answer: Annular and spiral thick carrier elements usually develop in the protoxylem when the roots or stems are maturing.