Tracheae

Q.

Why do most of the gymnosperms lack vessel elements in their xylem?

Q.

The main plant body is differentiated into true root stem and leaves in

Q.

The lignified cell wall is a characteristic feature of

1. Vessels

2. Sieve cells

3. Sieve tubes

4. All the above

Q. One of the characteristics of sieve tube is that it

1. transports water
2. is enucleated living cell
3. is dead cell
4. has annular thickenings on side walls

Q.

When did gymnosperms first appear?

Q. Vessels and sieve tubes are found in

1. Gymnosperms
2. Angiosperms
3. Gymnosperms and Angiosperms
4. All vascular plants

Q. A common structural feature of vessel elements and sieve tube elements is

1. Thick secondary walls
2. Pores on lateral wall
3. Presence of p-protein
4. Enucleate condition

Q.

Tracheae or xylem vessels are long tube-like structures that are formed by cells stacked like coins. How is the presence of inner lumen explained here?

1. The cells are ring shaped and therefore they can form a lumen when stacked.

2. The cells are sclerenchymatous and have a lumen because they lack lateral cell walls.

3. The lumens of the cells are aligned to form a tube-like structure.

4. Both b and c

Q. A common structural feature of vessel elements and sieve tube elements is

1. Thick secondary walls
2. Pores on lateral wall
3. Enucleate condition
4. Presence of p-protein

Q. .............. consist of perforated walls.

1. Companion cells
2. Sieve tubes
3. Xylem parenchyma
4. Phloem parenchyma

Q.

what is function of sieve cell

Q. A piece of wood having no vessels (Trachea) must be of

1. Mango
2. Pine
3. Palm
4. Teak

Q. Cytotoxic T-cells are similar to natural killler cells in secretion of

1. Interferons
2. Lysozymes
3. Perforins
4. Prostaglandins

Q. Passage cells are characteristic of

1. Bundle sheath of leaves
2. Secondary endodermis of monocots
3. Primary endodermis of dicots
4. All of the above

Q. Vessels are found in:

1. All angiosperms and some gymnosperm
2. Most of the angiosperm and few gymnosperms
3. All angiosperms, all gymnosperms and some pteridophyta
4. All pteridophyta

Q. .......... have tubular cells with perforated walls and are living in nature.

1. Tracheids
2. Companion cells
3. Sieve tubes
4. Xylem fibre

Q. Tracheids differ from other tracheary elements in

1. being lignified
2. having Casparian strips
3. being imperforated
4. lacking nucleus

Q. Assertion :Fibre tracheids in xylem provide mechanical support to the plant. Reason: Tracheids have secondary walls deposited with lignin

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Vessels are found in:

1. All angiosperms and some gymnosperm
2. Most of the angiosperm and few gymnosperms
3. All angiosperms, all gymnosperms and some pteridophyta
4. All pteridophyta

Q.

The xylem vessels have septae inside them.

1. True

2. False

Q.

The xylem vessels have septae inside them.

1. True

2. False

Q. Vessels are found in:

1. All angiosperms and some gymnosperm
2. Most of the angiosperm and few gymnosperms
3. All angiosperms, all gymnosperms and some pteridophyta
4. All pteridophyta

Q. What are the general characteristics of sclerenchyma tissue? Which type of cells of this tissue are the cause of grittiness of the pulp of pear?

Q. Bordered pits occur in

1. Secondary phloem
2. Protoxylem
3. Metaxylem
4. Bark

Q. Tracheids differ from other tracheary elements in

1. being lignified
2. having Casparian strips
3. being imperforated
4. lacking nucleus

Q.

Tracheae or xylem vessels are long tube-like structures that are formed by cells stacked like coins. How is the presence of inner lumen explained here?

1. The cells are ring shaped and therefore they can form a lumen when stacked.

2. The cells are sclerenchymatous and have a lumen because they lack lateral cell walls.

3. The lumens of the cells are aligned to form a tube-like structure.

4. Both b and c

Q.

Tracheae or xylem vessels are long tube-like structures that are formed by cells stacked like coins. How is the presence of inner lumen explained here?

1. The cells are ring shaped and therefore they can form a lumen when stacked.

2. The cells are sclerenchymatous and have a lumen, plus they lack lateral cell walls

3. The lumens of the cells are aligned to form a tube like structure

4. Both b and c