Question

If there is a leaf at a node bearing a single branch in its axil, a transverse section of the node shows the vascular system of the main stem, then the
A. Leaf trace, leaf gap, branch trace, and finally the branch gap
B. Branch gap, branch trace, leaf gap, and finally the leaf trace
C. Branch gap, leaf gap, leaf trace, and finally the branch trace
D. Branch trace, leaf gap, branch gap, and finally the leaf trace

Answer 1

Hint: A node of a plant refers to the region on the stem of the plant from where the leaves arise. The transverse system of the node shows the vascular system of the main stem and hence will have the same constituents as that of the plant.

Complete answer: If a leaf at a node bearing a single branch in its axil and a transverse section of the node shows the vascular system of the main stem then the next thing which we see is the vascular bundle and then after we find the branch gap which is the parenchymatous area in the vascular cylinder of stem at the end of the node.
Branch traces are the area related to the formation of breaks in the vascular cylinder generally around and about the point of departure in the trees.
Generally, the Leaf gap can be defined as space through which a leaf grows and leaves connected to the stem by the means of a leaf trace.

Hence, the correct option would be (B), Branch gap, Branch trace, leaf gap, and finally the leaf trace.

Note: The anatomy of the vascular supply of the plant is seen to be the same when looked from the nodal region with various parts like the branch gap and the leaf gap, which have the required space for the growth of branches and leaves respectively from the nodal region.