Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 64

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Question 1
1 / -0

Phellogen cuts off derivatives on the inner side to form _______ and on the outer side to form ________.

A
Cork, Secondary cortex

B
Secondary cortex, Cork

C
Cork cambium, Cork

D
Cork cambium, Secondary cortex

Solution

Phellogen or cork cambium cuts outs cells on either sides to form secondary cortex on the inner side, which is parenchymatous and hence living. It cuts off cork cells phellum cells on the outside which are non - living due to deposition of suberin making it impervious to water and pathogens. It has pores called lenticels for exchange of gases.
So, the correct answer is 'Secondary cortex, Cork'
Question 2
1 / -0

Y-shaped arrangement of xylem vessels is found in

A
Monocot stem

B
Dicot stem

C
Monocot root

D
Dicot root

Solution

The Y-shaped arrangement of xylem vessels is found in monocot stem, two metaxylem vessels are located at the upper two arms, while the base or the stick of the letter consists of one or two protoxylem vessels.
So, the correct answer is 'Monocot stem'
Question 3
1 / -0

Select the correct option:
In dicot stems, cambium present between primary xylem and primary phloem is

A
fascicular cambium

B
intrafascicular cambium

C
interfascicular cambium

D
both (a) and (b)

Solution

The cambium present between the xylem and phloem of a vascular bundle is called fascicular cambium. The fascicular cambium is also called as intrafascicular cambium since they are present inside the vascular bundle. In the beginning, the fascicular cambium is a primary meristem, later during the secondary growth; it gets transformed into a secondary meristem.
So, the correct option is 'both (a) and (b)'.
Question 4
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Refer to the given figure which represents a section of vascular bundle as seen in T.S. of a monocot stem and select the option that correctly labels A,B,C and D.

A
A-Protoxylem vessel, B-Metaxylem vessel, C-Protoxylem cavity, D-Phloem

B
A-Protoxylem vessel, B-Metaxylem vessel, C-Metaxylem cavity, D-Phloem

C
A-Metaxylem vessel, B-Protoxylem vessel, C-Protoxylem cavity, D-Phloem

D
A-Metaxylem vessel, B-Protoxylem vessel, C-Protoxylem cavity, D-Sclerenchyma

Solution

The given image is a transverse section of monocot stem.
Monocot stem is characterized by presence of collateral, closed scattered vascular bundles with well developed sclerenchymatous sheath outside and no pith at the center. The sheath is termed as bundle sheath.
The vascular bundles of monocot stem have xylem towards centre and phloem towards periphery. (D- Phloem)
The xylem formed first is present near the center and is termed as protoxylem, while metaxylem is present towards the periphery. (A - Metaxylem and B- Protoxylem )
Protoxylemt cavities are present on outer side of protoxylem, which are the result of crushed outer protoxylem.( C - Protoxylem cavity).
So, the correct option is (C).
Question 5
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In a mature dicot stem. which has undergone secondary growth, the youngest layer of secondary xylem is situated

A
In between pith and primary xylem

B
Just outside the vascular cambium

C
Just inner to the vascular cambium

D
Just inner to the phellogen

Solution

secondary xylem is also called wood. Any tissue located to the "outside" of the vascular cambium is considered bark and tissue side is called as wood.
So the correct option is 'Just inner to the vascular cambium.'
Question 6
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Match the following and choose the correct option from below.
A. Secondary meristem (i) Guard cells
B. Tracheids (ii) Single layer
C. Stomata (iii) Cork
D. Epidermis (iv) Tubular dead cells

A
A-(iii), B-(iv), C-(i), D-(ii)

B
A-(i), B-(ii), C-(iii), D-(iv)

C
A-(iii), B-(ii), C-(iv), D-(i)

D
A-(iii), B-(ii), C-(i), D-(iv)

Solution

A. Secondary meristem in the cortex forms the cork. Cork is made up of compactly arranged dead cells. It contains the waterproof substance suberin.
B. Tracheids are thick-walled tubular structures. They become dead as they mature. They play an important role in the transport of water and minerals vertically in plants.
C. Stomata are small pores found in the epidermis of the leaf. They are bound by two kidney-shaped guard cells.
D. Epidermis is the outermost layer of cells. It is mostly single-layered in all plants but in special cases, it can be more than one like in desert plants.
So, the correct option is A.
Question 7
1 / -0

Interfascicular cambium and cork cambium are formed due to-

A
Cell division

B
Cell differentiation

C
Cell dedifferentiation

D
Redifferentiation

Solution

$$\textbf{Correct option:}$$ (C)

$$\textbf{Explanation for correct option:}$$

$$\bullet$$ Differentiated cell has lost the power of division. Differentiation is the process by which a cell goes through the development and maturation in order to become more distinct in terms of form and function.

$$\bullet$$ A differentiated cell can regain its capacity for cell division under certain conditions which is called dedifferentiation.

$$\bullet$$ Dedifferentiation is the process by which formation of interfascicular cambium and cork cambium occurs from fully differentiated parenchyma cells.

$$\bullet$$ Redifferentiation is the process by which a dedifferentiated plant cell once again loses its capacity to divide and becomes mature.

$$\bullet$$ Hence the correct option is (C)
Question 8
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How many shoot apical meristems are likely to be present in a twig of a plant possessing $$4$$ branches and $$26$$ leaves?

A
$$26$$

B
$$1$$

C
$$5$$

D
$$30$$

Solution

$$\textbf{Correct option:}$$ (C)

$$\textbf{Explanation for correct option:}$$

$$\bullet$$ Apical Meristems are always likely to present at the growing apices.

$$\bullet$$ 4 growing apex of the branches and 1 growing apex of the main plant axis.

$$\bullet$$ Therefore the plant with 4 branches and 26 leaves will have 5 shoot apical meristems.

$$\bullet$$ Hence, the correct option is (C)
Question 9
1 / -0

Select the correct option:
Given are a few peculiar parts/structures found in plants Cucurbita stem, potato tuber, walnut shell, jute fibres.
Identify the tissue responsible for the distinguishing feature in each part respectively and select the correct option

A
Collenchymatous hypodermis, Parenchyma, Sclerenchyma, Phloem

B
Collenchymatous hypodermis, Sclerenchyma,Parenchyma, Phloem

C
Parenchymatous hypodermis, Parenchyma, Sclerenchyma, Xylem

D
Collenchymatous hypodermis, Parenchyma, Sclerenchyma, Xylem

Solution

1. Cucurbita stem: Collenchyma is the tissue of primary body. The cell walls show localized thickenings. It occurs chiefly in the hypodermis of dicot stems( e.g. Cucurbita, Helianthus).
2. Potato tuber: Parenchyma is cell and tissue type in which the cells have only thin primary walls. The cotyledon of many leguminous plants contains protein and starch in their parenchyma cells. Protein and starch are present in the parenchyma of potato tuber.
3. Walnut shell: Sclerenchyma consists of thick-walled dead cells. It usually occurs in hard parts of plant bodye.g. hard endocarp of Walnut, almond and coconut).
4. Jute fibres: Phloem fibres are also called bast fibres and most occur in secondary phloem. The fibres of primary phloem have both cellulose and lignified thickenings.
So, the correct answer is 'Collenchymatous hypodermis, Parenchyma, Sclerenchyma, Phloem'.
Question 10
1 / -0

Epiblema of roots is equivalent to-

A
Pericycle

B
Endodermis

C
Epidermis

D
Stele

Solution

$$\textbf{Correct option:}$$ (C)

$$\textbf{Explanation for correct option:}$$

$$\bullet$$ Epiblema of roots is equivalent to the epidermis.

$$\bullet$$ It is outermost, single layered and protective in function.

$$\bullet$$ Many cells of the epiblema protrude in form of unicellular root hairs.

$$\bullet$$ Hence the correct option is (C)

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A. Secondary meristem	(i) Guard cells
B. Tracheids	(ii) Single layer
C. Stomata	(iii) Cork
D. Epidermis	(iv) Tubular dead cells

Anatomy of Flowering Plants Test - 64

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Anatomy of Flowering Plants Test - 64

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Question 1

Cork, Secondary cortex

Secondary cortex, Cork

Cork cambium, Cork

Cork cambium, Secondary cortex

Solution

Question 2

Monocot stem

Dicot stem

Monocot root

Dicot root

Solution

Question 3

fascicular cambium

intrafascicular cambium

interfascicular cambium

both (a) and (b)

Solution

Question 4

A-Protoxylem vessel, B-Metaxylem vessel, C-Protoxylem cavity, D-Phloem

A-Protoxylem vessel, B-Metaxylem vessel, C-Metaxylem cavity, D-Phloem

A-Metaxylem vessel, B-Protoxylem vessel, C-Protoxylem cavity, D-Phloem

A-Metaxylem vessel, B-Protoxylem vessel, C-Protoxylem cavity, D-Sclerenchyma

Solution

Question 5

In between pith and primary xylem

Just outside the vascular cambium

Just inner to the vascular cambium

Just inner to the phellogen

Solution

Question 6

A-(iii), B-(iv), C-(i), D-(ii)

A-(i), B-(ii), C-(iii), D-(iv)

A-(iii), B-(ii), C-(iv), D-(i)

A-(iii), B-(ii), C-(i), D-(iv)

Solution

Question 7

Cell division

Cell differentiation

Cell dedifferentiation

Redifferentiation

Solution

Question 8

$$26$$

$$1$$

$$5$$

$$30$$

Solution

Question 9

Collenchymatous hypodermis, Parenchyma, Sclerenchyma, Phloem

Collenchymatous hypodermis, Sclerenchyma,Parenchyma, Phloem

Parenchymatous hypodermis, Parenchyma, Sclerenchyma, Xylem

Collenchymatous hypodermis, Parenchyma, Sclerenchyma, Xylem

Solution

Question 10

Pericycle

Endodermis

Epidermis

Stele

Solution

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