Anatomy Of Flowering Plants

Answer (d) Bast fibres from secondary phloem

Answer (b) Late wood

Cells of Grass leaves which help in minimising transpiration are bulliform cells.

Answer (b) Monocots

Lenticels are patches of loose cells on bark for aeration.

Answer (b) Shoot apex

Xerophytes are the plants living in xeric (dry) habitats. Plants growing in such regions develop characteristics to tolerate drought. Xerophytes develop the following characteristic features: In general the leaves are highly reduced to decrease loss of water by transpiration. In some plants leaves are modified into spines, e.g., Euphorbia, Opuntia. Waxy coating is present on leaves and stem as in Calotropis. Presence of sunken stomata covered by hair, e.g., Nerium and Ephedra. Stomata generally found on the lower surface of the leaves.

In dicot root the protoxylem is located near the periphery of the vascular cylinder, the metaxylem farther inward. In roots xylem is exarch or centripetal. In dicot stem the protoxylem is located near the centre of vascular bundle and metaxylem is located near the periphery i.e. the xylem is endarch or centrifugal.

Jute (Corchorus sp.) is a type of secondary bast fibre, of Family Malvaceae.

The vascular tissue of the root is characterised by radial arrangement of vascular bundles z.e., xylem and phloem occur in separate patches on alternate radii. The number of xylem and phloem groups vary from two to six. But tetrarch condition (four vascular bundles) is more common. Monocot root generally has more than six vascular bundles (polyarch). Vascular bundles in dicot stems are conjoint, collateral or bicollateral, endarch and open. They are arranged in a ring. In monocot stems the vascular bundles are conjoint, collateral, endarch and closed. They are scattered in the ground tissue.

Answer (c) lenticels

Answer (a) secondary xylem

Answer (d) Protoderm

Answer (b) Cells are arranged with intercellular spaces

Step 1: Understanding the terms.
In dictyostele, the vascular bundles are arranged in such a way that they have both xylem and phloem tissues arranged in a circular manner. In dictyostele, the vascular bundles are amphivasal. This means that the xylem is located in the center and phloem is located at the periphery. Step 2: Conclusion.
The correct answer is (4) Amphivasal bundles.