Question

In barley stem, vascular bundles are
A) Open and scattered
B) Closed and scattered
C) Open and in a ring
D) Closed and radial

Answer 1

Hint:There were thick-walled cells in the vascular tissue under the ovary. In the phase of translocation and grain size, these cells as well as the funiculus-chalaza area cells may be essential.

Complete answer:
First we should know about barley stems to answer this question. There were two broad lateral vascular bundles as well as a number of smaller median or outer lateral vascular bundles in the mature rachis internodes of a two-row barley ear. With no cross ties between them, these bundles extended nearly the full length of the rachis. At every node, the lateral or outer lateral bundles branched, while at the other node the median bundles branched.
Now, let us find the solution from the options-
- There was a core in vascular tissue in the barley spikelet axis in which the usual collateral bundle arrangement was not distinct. Thus, option A is not the correct option
- Barley is just a monocot. Vascular bundles are closed in the monocot stem since they do not have vascular cambium and therefore no secondary development is seen in the monocot stem. Vascular wraps are distributed in the tissue of the field.
- In four bundles of which the adaxial bundle passing close to a ovule was the largest, the vascular tissue of the spikelet axis ended in the ovary. Thus, option C is not the correct option.
- The structure of the vascular strands and the existence of transfer cells showed that assimilation can be easily translocated to the rising grain, especially from the lemma. Thus, option D is not the correct option

Thus, the correct answer is option (B) Closed and scattered.

Note:Each spikelet has its vascular bundles going through a complex area in which transfer cells took place. Production of the young main shot ear vascular system began when the procambium of lateral bundles was begun at the triple mound level. With some separation of protophloem and protoxylem, initiation of the median bundles and the outer lateral bundles followed in series.