Question

2. ___________ transport substances only in upward direction in plants.
3. ___________ and _______ are two major elements of xylem.​

Answer 1

Answer:

2. Xylem transports water and minerals from the roots to other parts of the plant. It transports sap upwards only, as all other parts of the plant are in upward direction.

3. The primary xylem is composed of protoxylem and metaxylem. Secondary growth in thickness of the stem and root of gymnosperms and dicotyledons is accompanied by the formation of secondary xylem. The structural elements of xylem are tracheids, vessels or tracheae, xylem fibres, xylem parenchyma and rays.

                                                 

                                                or

The structural elements of xylem are tracheids, vessels or tracheae, xylem fibres, xylem parenchyma and rays. The tracheid is derived from a single cell and can be regarded as the basic cell type of xylem tissue.

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Answer 2

Answer:

2. Xylem.

3. Trachiade and xylem vessels etc.