Secondary Growth in Stem

Q. Identify the correct set of statements:

(a) The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea

(b) Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin

(c) Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves

(d) Rhizophora shows vertically upward growing roots that help to get oxygen for respiration

(e) Subaerially growing stems in grasses and strawberry help in vegetative propagation

Choose the correct answer from the options given below :

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

Q. Gymnosperms are also called soft wood spermatophytes because they lack

1. Cambium
2. Phloem fibres
3. Thick -walled tracheids
4. Xylem fibres

Q.

Banana is vegetatively propagated by

1. Suckers

2. Rhizomes

3. Tubers

4. Bulbs

Q.

Tunica corpus theory is connected with:

1. root apex

2. root cap

3. shoot apex

4. root growth

Q.

Secondary growth does not occur in monocots as their vascular bundles are -

1. Closed

2. Scattered

3. Radial

4. Enclosed by sclerenchyma

Q.

Potato tuber is a modified or the edible part of the potato that is

1. Root

2. Stem

3. Bulb

4. Stolon

Q. Name the various kinds of cell layers which constitute the bark.

Q. The vascular cambium normally gives rise to:

1. Primary phloem
2. Secondary xylem
3. Periderm
4. Phelloderm

Q.

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

1. Secondary phloem

2. Cortical cells

3. Protoxylem

4. Secondary xylem

Q.

What is the difference between primary and secondary phloem?

Q.

Define girth of the stem.

Q.

The girth of stem increases due to :

1. Lateral Meristem

2. Apical Meristem

3. Intercalary Meristem

4. None of them.

Q.

Explain the process of secondary growth in stems of woody angiosperm with help of schematic diagrams. What is the significance?

Q.

Wood is a common name for

1. cambium

2. vascular bundles

3. phloem

4. secondary xylem

Q. Anatomically, the bark of a tree consists of

1. cork and the secondary cortex
2. all tissues outside the secondary cortex
3. all tissues outside the vascular cambium
4. phellem and the cork cambium

Q.

The youngest secondary phloem in a dicot stem is

1. Inside the primary phloem

2. Just outside the xylem.

3. Just outside vascular cambium

4. Inside vascular cambium

Q.

Periderm is produced from

1. Secondary cortex

2. Pro-cambium

3. Cork cambium

4. Vascular cambium

Q. Eyes of potato are

1. adventitious root
2. axillary bud
3. apical bud
4. none of these

Q. Interfascicular cambium develops from the cells of:

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

Q. Which of the following is/are present in periderm?

1. Cork
2. All the above
3. Secondary cortex
4. Cork cambium

Q.

The ‘eyes’ of the potato tubers are

1. Flower buds

2. Root buds

3. Axillary buds

4. Shoot buds

Q. For an increase in girth of the stem and thickness of the root,

1. meristem located at the base of nodes and internodes is responsible
2. meristem located in the root apex and the shoot apex is responsible
3. meristem located on the sides of the root and shoot tissues are responsible
4. only vascular bundle is responsible

Q. Potato is a type of

1. Runner
2. Stem tuber
3. Rhizome
4. Root tuber

Q.

Latex vessels are found in

I. Calotropis
II. Hevea
III. Oleander
IV. Papaya

1. I, II and III are correct

2. I and II are correct

3. II and IV are correct

4. I and III are correct

Q. Choose the correct labelling of the parts marked as A to F.

1. A – Phellem, B – Phellogen, C – Medullary rays, D – Secondary xylem, E – Secondary phloem, F – Cambium ring
2. A – Phellem, B – Phellogen, C – Medullary rays, D – Secondary phloem, E – Secondary xylem, F – Cambium ring
3. A – Phellogen, B – Phellem, C – Medullary rays, D – Secondary xylem, E – Secondary phloem, F – Cambium ring
4. A – Phellem, B – Phellogen, C – Cambium ring, D – Secondary xylem, E – Secondary phloem, F – Medullary rays

Q. Gymnosperms are also called soft wood spermatophytes because they lack

1. Thick -walled tracheids
2. Xylem fibres
3. Cambium
4. Phloem fibres

Q. Conjoint, closed type of vascular bundles are characteristic of

1. Dicot stem
2. Monocot stem
3. Monocot root
4. Dicot root

Q. The leaves of gymnosperms are well adapted to withstand extremes of environmental conditions due to

1. Being broad and hard
2. Presence of thick cuticle and sunken stomata
3. Presence of superficial stomata
4. Presence of transfusion tissue

Q. Identify the contraceptive device shown below and identify its implantation site.Select the correct option:

	Contraceptive device	Site of implantation
1	Lippes Loop	Uterine wall
2	LNG-20	Fallopian tube
3	Multiload 375	Uterine wall
4	Implants	Subcutanceous

1. 1, 2, 3
2. 2, 3, 4
3. only 4
4. 1, 3, 4

Q. Tunica corpus theory was given by

1. Schmidt
2. Hanstein
3. Schuessler
4. Nageli