Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 12

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Question 1
1 / -0

The epidermal, ground and vascular systems of plants are developed, respectively, from

A
Protoderm, ground meristem and procambium

B
Protoderm, procambium and ground meristem

C
Ground meristem, procambium and protoderm

D
Procambium, protoderm and ground meristem
Solution
Three concentric regions of primary meristematic tissues develop immediately behind the apical meristem . These primary meristems produce the different tissues of the plant body:
The outermost protoderm differentiates into the epidermis; a tissue that protects the plant;
The adjacent ground meristem differentiates into the central ground tissues (the pith and cortex);
The procambium differentiates into the vascular tissues (the xylem, phloem, and vascular cambium).
So, the correct option is A.( Protoderm, ground meristem and procambium )
Question 2
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Where would you look for active cell division in plants?

A
In the pith cells

B
In the cells of cortex

C
In the internodal region

D
At the tip of root and shoot

Solution

Meristem is the region of the plant where active cell division can be seen. It is the part where cells are continuously dividing into different types of cells
In plants the growth is represented by the growth at the tips and the roots as there will be more number of meristems at the tips of roots and stems.

Hence the correct option is D
Question 3
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Plant growth in length is increased by

A
Apical meristem

B
Lateral meristem

C
Dermatogen

D
Periblem

Solution

Apical meristem is found at the growing tips, that is root and shoot tips. These are actively dividing cells and are thus responsible for the growth of plant length-wise. Rapid division of meristematic cells can cause the plant to grow tall. There are several hormones like auxin which stimulate the multiplication of meristematic cells.
Question 4
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In the primary tissues of the stem, the cambium separating xylem and phloem is called

A
Procambium

B
Intrafascicular cambium

C
Cork cambium

D
Interfascicular cambium
Solution
- The cambium present within the vascular bundle is called intrafascicular cambium. It is present between the primary xylem and primary phloem. It is primary in origin.
- Procambium is the primary meristem of a plant that forms the cambium and primary vascular tissues.
- Cork cambium is the tissue found in many vascular plants as part of the periderm. It is found in the stem and gives rise to cork on its outer surface and a layer of cells containing chlorophyll on its outer.
- The new strip of cambium which is formed from the permanent cells of interfascicular parenchyma is called the interfascicular cambium. It is secondary in origin as it is derived from the permanent cells of medullary rays.
So, the correct answer is option B.
Question 5
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The fibres of commercial importance are obtained from

A
Parenchyma

B
Collenchyma

C
Chlorenchyma

D
Sclerenchyma

Solution

Sclerenchyma is the tissue which makes the plant hard and stiff. It is the supporting tissue in plants and is composed of dead cells with highly thickened cell walls (due to extensive deposition of lignin).Two types of sclerenchyma cells exist: fibers and sclereids.
Sclerenchyma fibers are of great economic importance, since they constitute the source material for many fabrics (e.g. flax, hemp, jute, etc).
Hence the correct option is D.
Question 6
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The function of cork cambium (phellogen) is to produce

A
Cork and secondary cortex

B
Secondary xylem and secondary phloem

C
Cork and secondary phloem

D
Secondary cortex and phloem
Solution
The cork cambium is a lateral meristem that divides to produce cork (phellem) on the outer side and secondary cortex (phelloderm) on the inner side.
Phellogen (cork cambium) is defined as a meristematic cell layer responsible for the development of the periderm (phellem + phellogen + phelloderm).
The secondary xylem and secondary phloem are produced by the vascular cambium.
Hence, the correct answer is option A.
Question 7
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In roots and stems, secondary growth takes place after the formation of

A
Cambium

B
Sclerenchyma

C
Cork

D
Bark
Solution
Apart from primary growth most dicotyledonous plants exhibit an increase in girth. This increase is called secondary growth.
The tissues involved in secondary growth are the two lateral meristems: vascular cambium and cork cambium.
Once the formation of the cambial ring is complete then secondary growth starts with the formation of secondary xylem and secondary phloem.
The cambial ring becomes active and begins to cut off new cells, both towards the inner and the outer sides. The cells cut off towards pith, mature into secondary xylem, and the cells cut off towards periphery mature into secondary phloem.
So, the correct answer is 'Cambium'.
Question 8
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What do you mean by closed vascular bundle ?

A
Presence of cambium

B
Absence of cambium

C
Presence of periderm

D
None of these

Solution

A closed vascular bundle means the absence of a cambium. They do not show secondary growth. The closed vascular bundles are generally found in monocotyledons.
Hence the answer to the question is B
Question 9
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Annual growth rings are formed due to activity

A
Extrastellar cambium

B
Intrastellar cambium

C
Interstellar cambium

D
Both (b) and (c)

Solution

Annual growth rings are formed due to the activity of of the intrastellar or vascular cambium. The fascicular (vascular) and interfascicular cambium join together to form the cambial ring that adds secondary xylem towards the pith and secondary phloem towards the periphery. The cambial ring is formed twice in a year, that is in the autumn and spring, however the activity in the two seasons is not the same, giving rise to two rings of different circumference and color, which makes one growth ring/annual ring.
So, the correct answer is 'Intrastellar cambium'
Question 10
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The stele found in monocot is

A
Haplostele

B
Atactostele

C
Dictyostele

D
Actinostele

Solution

In a plant the xylem and phloem together make up the vascular bundles. In a monocot, these vascular bundles do not possess a cambium and do not form secondary tissues and are said to be closed. In conjoint vascular bundle we have the xylem and phloem on the same radius of the vascular bundles, which we can find in stems and leaves. The arrangement of vascular tissue with vascular bundles scattered, conjoint, collateral and closed is called an atactostele.

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Anatomy of Flowering Plants Test - 12

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Anatomy of Flowering Plants Test - 12

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Question 1

Protoderm, ground meristem and procambium

Protoderm, procambium and ground meristem

Ground meristem, procambium and protoderm

Procambium, protoderm and ground meristem

Solution

Question 2

In the pith cells

In the cells of cortex

In the internodal region

At the tip of root and shoot

Solution

Question 3

Apical meristem

Lateral meristem

Dermatogen

Periblem

Solution

Question 4

Procambium

Intrafascicular cambium

Cork cambium

Interfascicular cambium

Solution

Question 5

Parenchyma

Collenchyma

Chlorenchyma

Sclerenchyma

Solution

Question 6

Cork and secondary cortex

Secondary xylem and secondary phloem

Cork and secondary phloem

Secondary cortex and phloem

Solution

Question 7

Cambium

Sclerenchyma

Cork

Bark

Solution

Question 8

Presence of cambium

Absence of cambium

Presence of periderm

None of these

Solution

Question 9

Extrastellar cambium

Intrastellar cambium

Interstellar cambium

Both (b) and (c)

Solution

Question 10

Haplostele

Atactostele

Dictyostele

Actinostele

Solution

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