Primary Xylem

Q. Vascular cambium is a meristematic layer that cuts off :

Q.

The water-conducting tissue generally present in gymnosperm is

1. vessels

2. sieve tube

3. tracheid

4. xylem fibres

Q. If under root 7 minus one upon under root 7 + 1 minus under root 7 plus one upon under root 7 - 1 equals to a + b under root 7

Q.

Early formed xylem is

1. Protoxylem

2. Metaxylem

3. Uniseriate

4. Multiseriate

Q. Anatomically, the root of the fairly old dicotyledonous plant is distinguished from its stem by

1. position of protoxylem
2. absence of secondary xylem
3. absence of secondary phloem
4. presence of cortex

Q. The lateral roots originate from

1. Endoderm cells
2. Pericycle cells
3. Epiblema
4. cortical cells below root hairs

Q.
When does the lignification of xylem vessels in protoxylem happen?

1. Before maturation of stem and root

2. Before elongation of stem and root

3. After widening of stem and root

4. During differentiating of stem and root

Q. Read the different components from (a) to (d) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem.
(a) Secondary cortex
(b) Wood
(c) Secondary phloem
(d) Phellem

1. (d), (c), (a), (b)
2. (c), (d), (b), (a)
3. (a), (b), (d), (c)
4. (d), (a), (c), (b)

Q. Anatomically, the root of the fairly old dicotyledonous plant is distinguished from its stem by

1. position of protoxylem
2. absence of secondary xylem
3. absence of secondary phloem
4. presence of cortex

Q. When does the lignification of xylem vessels in protoxylem happen?

1. maturing

2. elongating

3. widening

4. differentiating

Q.

What kind of thickening is seen in protoxylem?

1. Reticulate

2. Pitted

3. Annular

4. Scalriform

Q.

Early formed xylem is

1. multiseriate

2. protoxylem

3. metaxylem

4. uniseriate

Q.

Early formed xylem is

1. Protoxylem

2. Metaxylem

3. Uniseriate

4. Multiseriate

Q. Which among the following is/are constituent(s) of primary xylem?

1. Tracheids
2. Protoxylem
3. Xylem fibres
4. Metaxylem

Q.

What kind of thickening is seen in protoxylem?

1. Scalriform

2. Reticulate

3. Pitted

4. Annular

Q. Interfascicular cambium develops from the cells of :

1. Medullary rays
2. Xylem parenchyma
3. Endodermis
4. Pericycle

Q. Anatomically, the root of the fairly old dicotyledonous plant is distinguished from its stem by

1. position of protoxylem
2. absence of secondary xylem
3. absence of secondary phloem
4. presence of cortex

Q. Which among the following is/are constituent(s) of primary xylem?

1. Tracheids
2. Protoxylem
3. Xylem fibres
4. Metaxylem