Question

Ochreate stipules occur in leafy vegetables
A)Amaranthus
B)Mentha
C)Platanus
D)Rumex

Answer 1

In botany, a stipule is an outgrowth borne on either side of a leafstalk base (sometimes just one side) (the petiole). A pair of spikes is known to be part of the leaf anatomy of a typical flowering plant, but the spikes are inconspicuous or entirely absent in many species and the leaf is then called exstipulate.

Complete answer:
The three types of stipulations are deciduous, deciduous and persistent, depending on their duration. Caducous stipulations fall off before the leaf unfolds, while the deciduous stipulations fall off immediately after the leaf unfolds. The plant remains affixed to persistent stipules.

Consideration may be given to free lateral, adnate, interpetiolar, intrapetiolar, ochre, foliaceous, bud scales, tendrillary, or spiny stipules.

From the same node, a stipule can be fused to the stem, or to the other stipule.
A stipule is "ochreate" if the solid tube that goes all the way around the stem appears to be a single stipule.

The stipules in the ocherate are in the form of a tubular sheath around the internode. These are seen in vegetables like Rumex and Polygonum that are leafy. In Lathyrus aphaca, foliaceous stipules occur. In Smilax, tendrillar stipules occur.

In most plants with tri-lacunary nodes, there is a relationship between the morphology of the stem node and the presence or absence of stipules. There are no stipules in species with unilacunary nodes.
As glands, scales, hairs, spines, or laminar (leaf-like) structures, stipules can appear and are morphologically variable.

There are different functions for stipules. Some stipules may be vestigial or not well understood.
Foliaceous stipules are known to be used like leaves to produce energy for plants. The next leaf or bud is sometimes protected by stipules as it develops and then falls off after the leaf unfolds, as with Tulip Poplars. Climbing plants can use stipules as climbing tendrils. To help protect the plant from animals, spiny stipules can be used.

Hence, the correct answer is option (D)

Note: The position of stipules on a plant varies widely, though they are often located near the base of a leaf, from species to species. On dicotyledons, where they appear in pairs alongside each leaf, the stipules are most common. Many monocotyledon plants have stipule-like structures, but only one per leaf is shown.