Xylem

Q.

(a) Draw a labelled diagram of (i) a xylem vessel, and (ii) a sieve tube (or phloem).
(b) What are the differences between the transport of materials in xylem and phloem ?

Q.

Name the tissue which transports water and minerals in plants ___.

Q.

By which phenomenon does the water rise from roots to leaves of plants?

Q.

What is the function of xylem fibers?

Q.

What is xylem tissue ? Name the two kinds of cells in xylem tissue. State whether these cells are living or dead.

Q.

Example of complex tissue.

Q.

How does transpiration pull water upwards?

Q.

Plants can use relatively slow transport system. Why?

Q.

What substance/substances are transported in plants by :
(a) xylem vessels and tracheids ?
(b) sieve tubes (or phloem) ?

Q.

Why are amides transported to other plant parts through the xylem vessels?

Q.

What facilitates the movement of water from soil to roots of plants?

1. Water pressure.

2. All of the above

3. Presence of root hairs.

4. Ion concentration gradient.

Q. Case: Transpiration is the evaporative loss of water by plants. It occurs mainly through the stomata in the leaves. Besides the loss of water vapour in transpiration, exchange of oxygen and carbon dioxide in the leaf also occurs through pores called stomata. Normally stomata remain open during the day and close at night.

Based on the above case answer the following question:

Which of the following is not a purpose of transpiration?

1. Helps in absorption and transport in plants.
2. Prevents loss of water.
3. Maintains shape and structure of plants by keeping the cells turgid.
4. Supplies water for photosynthesis.

Q.

Out of xylem and phloem, which one carries materials :
(a) upwards as well as downwards ?
(b) only upwards ?

Q.

Vascular tissues that transport water and minerals in plants are called as ___________.

1. Phloem

2. Xylem

3. Sclerenchyma

4. Cambium

Q.

Which of the following is the only conducting tissue in non-flowering plants ?
(a) xylem vessels
(b) sieve tubes
(c) companion cells
(d) tracheids

Q. Water from xylem moves into regions of phloem which have a concentration of sugar by the process of .

1. low
2. high
3. osmosis
4. diffusion

Q.

The tissue responsible for the ascent of sap.

Q.

Mention the role of water in plants.

Q.

In autotrophs, water is transported through :
(a) root hair
(b) phloem
(c) stomata
(d) xylem

Q.

There is a direct relationship between absorption and _________________.

Q.

Examples of complex tissue

Q.

For plants, ___ is the nearest and richest source of raw materials like nitrogen, phosphorus and other minerals.

Q. How are water and minerals transported in plants?

Q.

Name the tissue which transports water and minerals in plants ___.

Q.

Name the plant tissue having a dead cell?

Q.

Apart from the conduction of water, xylem also

1. Conducts organic food

2. Gives mechanical strength

3. Helps in gaseous exchanges

4. Helps in transpiration

Q.

____ conducting tissue transports water and minerals from roots upwards towards the leaves.

Q.

Different cells that make up xylem tissue.

Q.

How do plants absorb water from the soil?

Q.

Differentiate between xylem and phloem w.r.t conduction and conducting channels.