T.S of Dicot Stem

Q.

Which of the statements given below is not true about formation of annual rings in trees?

1. Annual rings are not prominent in trees of temperate region.

2. Annual ring is a combination of spring wood and autumn wood produced in a year.

3. Differential activity of cambium causes light and dark bands of tissue in early and late wood, respectively.

4. Activity of cambium depends upon variation in climate.

Q.

Differentiate between dicotyledonae and monocotyledonae.

Q.

You might have seen that even after grazing by herbivores, grasses regenerate from the remaining parts. Which tissue is responsible for this and where it is located?

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. Give some examples of roots that are modified for storage.

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. Epiblast is an outgrowth of

1. Scutellum
2. Plumule
3. Coleoptile
4. Coleorhiza

Q.

The complementary cells occur in?

1. Pericycle

2. Pith

3. Lenticels

4. Endodermis

Q.

Casparian strips occur in

1. Pericycle

2. Cortex

3. Endodermis

4. Epidermis

Q.

Which of the meristem is formed due to dedifferentiation?

Q.

Is bamboo plant a gymnosperm?

Q.

Cut a transverse section of the young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or dicot stem? Give reasons.

Q.

Why safranin stain is used during the experiment of studying Transversal section of dicot or monocot stem?

Q.

Which of the following statements are true :

(I) Uneven thickening of the cell walls is a characteristic of sclerenchyma.

(II) Tracheids are the chief water transporting elements in gymnosperms.

(III) Companion cells are devoid of nucleus at maturity.

1. I , II and III

2. II and III

3. I and II

4. Only II

Q. Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by:

1. Absence of secondary phloem
2. Presence of cortex
3. Position of protoxylem
4. Absence of secondary xylem

Q.

(b) Give the exact location of lenticels.

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.

Casparian strips occur in

1. Pericycle

2. Endodermis

3. Epidermis

4. Cortex

Q. Select the correctly matching set.

1. Monocot stem - Kidney shaped guard cells;
   Dicot stem - Dumb bell-shaped guard cells
2. Monocot stem - Sclerenchymatous hypodermis;
   Dicot stem - Collenchymatous hypodermis
3. Monocot stem - Medullary rays present;
   Dicot stem - Medullary rays absent
4. Monocot stem - Vascular bundles of similar size;
   Dicot stem - Vascular bundles of different sizes

Q.

How are meristems classified based on their functions?

Q.

In the endarch type of primary xylem seen in stems, where is the metaxylem found?

Q.

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

1. Cambium Present absent

2. Phloem parenchyma Present absent

3. Xylem centripetal centrifugal

4. Vessels Many in number 3-4 in number

Q. Which statement(s) is/are true?
(a) Open vascular bundles are found in dicot stem.
(b) Porous wood is found in Pinus.
(c) Cortex is made up of only parenchymatous cells.
(d) Passage cells are found in endodermis of orchid roots.

1. a and b
2. b and c
3. c and d
4. a and d

Q. Centrioles have following kind of tubular arrangement

1. 8+1
2. 9+11
3. 9+0
4. 9+2

Q. Read the following statements (I - III) related to temperate regions and identify the correct option.

I. Temperate areas have experienced frequent glaciations in the past.
II. Temperate environments are more seasonal and relatively less constant.
III. The average temperature of the coldest months in the temperate zone is greater than that of the tropical zones.

1. Only I is correct
2. I and II are incorrect and III is correct
3. I and II are correct and III is incorrect
4. I and III are correct and II is incorrect

Q. Read the following statements (I - III) related to temperate regions and identify the correct option.

I. Temperate areas have experienced frequent glaciations in the past.
II. Temperate environments are more seasonal and relatively less constant.
III. The average temperature of the coldest months in the temperate zone is greater than that of the tropical zones.

1. Only I is correct
2. I and II are incorrect and III is correct
3. I and II are correct and III is incorrect
4. I and III are correct and II is incorrect

Q. What is periderm? How does periderm formation takes place in the dicot stem?

Q. Identify the incorrect order of components with reference to their arrangement from outside to inside in a woody dicot stem.

1. Epiblema, cortex, pericycle, endodermis
2. Epidermis, hypodermis, phellogen, phelloderm
3. Epidermis, phellem, phellogen, endodermis
4. Epidermis, phellem, phellogen, phelloderm

Q. Draw a well labelled diagram of a typical dicot stem.

Q. A dicot in which stem has scattered vascular bundles is

1. Yucca
2. Pepromia
3. Helianthus
4. Dolichos