T.S of Dicot Stem

Q. The following diagrams show the types of secondary thickening in the xylem vessels. Identify the types labelled from A-F. Choose the correct option from those given

1. A-Spiral, B-Annular, C-Reticulate, D-Scalariform, E-Pitted with border, F-Pitted, simple
2. A-Annular, B-Spiral, C-Scalariform, D-Reticulate, E-Pitted with border, F-Pitted, simple
3. A-Spiral, B-Annular, C-Scalariform, D-Reticulate, E-Pitted with border, F-Pitted, simple
4. A-Annular, B-Spiral, C-Scalariform, D-Reticulate, E-Pitted, simple, F-Pitted with border

Q.

Vascular bundles in a dicot stem are:

1. Open, Collateral, Exarch

2. Closed, Collateral, Endarch

3. Closed, Collateral, Exarch

4. Open, Collateral, Endarch

Q.

Which among the following is not a real difference between a dicot stem and monocot stem regarding their vascular bundles?

1. Cambium is present in dicot stem and absent in monocot stem

2. Phloem parenchyma present in dicot stem and absent in monotcot stem

3. Xylem is centripetal in dicot stem and centrifugal in monocot stem

4. Vessels are conjoint in dicot stem and collateral in monocot stem

Q.

In a dicotyledonous stem, the sequence of tissues from the outside to the inside is

1. Phellem-pericycle-endodermis-phloem

2. Phellem-phloem-endodermis-pericycle

3. Phellem-endodermis-pericycle-phloem

4. Pericycle-phellem-endodermis-phloem

Q.

Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by

1. absence of secondary xylem

2. position of protoxylem

3. absence of secondary phloem

4. presence of cortex

Q. Choose the correct option with respect to dicot stem:
i) Vascular bundles are arranged in a ring
ii) Exarch arrangement of secondary xylem
iii) Vascular bundles are conjoint, collateral and open type

1. Only I is correct
2. Only II is correct
3. Both I and III are correct
4. All (I, II and III ) are correct

Q. Given below are descriptions regarding the stem of a dicot plant. Identify the correct statements from the following.
A. The protoxylem lies towards the periphery and the metaxylem lies towards the center.
B. Since they lack cambium, the vascular bundles are closed.
C. Vascular bundles are arranged in a ring.

1. A and B
2. B and C
3. Only C
4. A, B and C

Q.

If you are given the hypodermis layer of dicot and a monocot stem, how will you differentiate?

1. Dicots have collenchymatous hypodermis, while it is parenchymatous is monocots

2. Monocots have collenchymatous hypodermis, while it is sclerenchymatous is dicots

3. Monocots have sclerenchymatous hypodermis, while it is collenchymatous in dicots

4. Monocots do not have a hypodermis

Q.

__ in the dicot stem is made of collenchyma cells