Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 62

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Weekly Quiz Competition

Question 1
1 / -0

Which plant part possesses polyarch condition of vascular bundles with a well developed pith?

A
Dicot root

B
Monocot root

C
Dicot stem

D
Monocot stem

Solution

A monocot root possesses polyarch (more than 4) condition of vascular bundle, here the vascular bundles are radial, closed with exarch condition of the xylem, embedded in the ground tissue that has a well developed central region or the pith or medulla.
So, the correct answer is 'Monocot root'
Question 2
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A diagram of T.S. of dicot root is given. Select the option which correctly labels A,B,C,D and E.

A
A-Protoxylem, B-Metaxylem, C-Phloem, D-Pericycle, E-Endodermis

B
A-Metaxylem, B-Protoxylem, C-Phloem, D-Percyicle, E-Endodermis

C
A-Protoxylem, B-Metaxylem, C-Phloem, D-Endodermis, E-Pericycle

D
A-Metaxylem, B-Protoxylem, C-Phloem, D-Endodermis, E-Pericycle

Solution

In a dicot root the vascular bundles are radial, tetrarch and closed.
The xylem is exarch with protoxylem B) towards the periphery and metaxylem (A) towards the the pith. The phloem (C) is adjacent to the xylem. The vascular bundle is surrounded by pericycle (D), which is further surrounded by endodermis (E)
So, the correct answer is 'A-Metaxylem, B-Protoxylem, C-Phloem, D-Percyicle, E-Endodermis'
Question 3
1 / -0

Casparian strips are the bands of thickenings present on _____ walls of endodermis.

A
Radial

B
Tangential

C
Central

D
Both (a) and (b)

Solution

Casperian strips are bands of thickenings present on the radial and transverse walls of the endodermis. These strips are chemically made of suberin.
So, the correct answer is 'Both (a) and (b)'

Question 4

1 / -0

Select the correct option:

Identify the types of vascular bundle in the figures (i) and (ii) and select the correct option.

(A) Conjoint collateral -	Conjoint bicollateral
(B) Conjoint bicollateral -	Conjoint collateral
(C) Conjoint collateral closed -	Conjoint collateral open
(D) Conjoint collateral open -	Conjoint collateral closed

A

B

C

D

Solution

The vascular bundle in figure i - is conjoint (xylem and phloem together), colateral (both present on the same axis) and closed (for secondary growth) because cambium is absent. Example, monocot stem.

The vascular bundle in figure ii - is also conjoint and colateral but shows presence of a cambial strip or vascular cambium in between xylem and phloem, hence it is open for secondary growth as in dicot stem.

So, the correct answer is 'C'

Question 5
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Vascular cambium and cork cambium are ______________.

A
lateral meristems

B
intercalary meristems

C
primary meristems

D
apical meristems.

Solution

The lateral meristems e.g., vascular cambium and cork cambium (in dicotyledons and gymnosperms) are the meristems that cause increase in girth of the organs in which they are active. This is known as secondary growth of the plant.

Question 6

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Following table summarises the differences between a monocot root and a dicot root.

	Characters	Monocot root	Dicot root
(i)	Vascular bundle	Polyarch i.e., more than $$6$$ vascular bundles	Diarch to hexarch i.e., $$2-6$$ vascular bundles
(ii)	Cambium	Absent	Present, so secondary growth occurs
(iii)	Pith	Poorly developed	Well developed large pith
(iv)	Activity of pericycle	Gives rise to secondary roots and cork cambium	Gives rise to lateral roots only

Identify the incorrect differences and select the correct option.

(i) and (iii)

(i) and (iv)

(iii) and (iv)

(ii) and (iii)

Solution

On comparing monocot and dicot roots -

In monocot root, a well-developed pith is present whereas, in dicot root, pith is poorly developed. In monocot root, pericycle gives rise to lateral roots only whereas in dicot root, pericycle given rise to secondary roots and cork cambium.

So, the correct answer is (C).

Question 7
1 / -0

Read the following statements :
(i). In monocot root, a large number of vascular bundles are arranged in the form of a ______ around the central _______
(ii). Due to the presence of ______, the endodermal cells do not allow wall to wall movement of substances between cortex and pericycle, in a primary dicot root.
(iii). The epidermis of stem of sunflower bears several unbranched _______ hair.
(iv). The central portion of a dicot stem is usually occupied by ______ comprising of thin-walled parenchymatous cells
Select the option that correctly fills the blanks in any two of them.

A
(i) ring, pith; (ii) hypodermis

B
(ii) Casparian strips; (iii) unicellular

C
(i) ring, cortex; (iv) vascular bundles

D
(iii) multicellular; (iv) pith
Question 8
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Hypodermis is _______ in sunflower stem and _________ in maize stem.

A
Parenchymatous, Collenchymatous

B
Collenchymatous, Sclerenchymatous

C
Sclerenchymatous, Collenchymatous

D
Sclerechymatous, Parenchymatous

Solution

Hypodermis is a distinctive layer of mechanical tissue present in some dicot and monocot stems. It is collenchymatous and present as 3-4 layers. It provides mechanical support and elasticity, also stores food.
In maize the hypodermis consists of a few layers of sclerenchymatous cells, interspersed by chlorenchyma cells. It provides mechanical support to the plant.
So, the correct answer is 'Collenchymatous, Sclerenchymatous'
Question 9
1 / -0

Select the incorrect statement regarding the anatomy of a typical monocotyledonous stem

A
Phloem parenchyma is absent.

B
Vascular bundles are scattered, conjoint, collateral and closed

C
Each vascular bundle is surrounded by a bundle sheath.

D
Ground tissue is differentiated into cortex, endodermis, pericycle and pith

Solution

In a monocot stem (Example Maize), the stem is differentiated into Epidermis, hypodermis and ground tissue. In the ground tissue are embedded vascular bundles that are conjoint, colateral and closed.The vascular bundles are not enclosed by endodermis and pericycle.
So, the correct answer is 'Ground tissue is differentiated into cortex, endodermis, pericycle and pith'
Question 10
1 / -0

Select the mismatched pair.

A
Collateral and open vascular - Sunflower stem bundles

B
Bicollateral vascular bundles - Maize stem

C
Concentric vascular bundles - Ferns

D
Radial vascular bundles - Maize root
Solution
Correct Option: B

Explanation:
- Bicollateral vascular bundles contain xylem sandwiched between phloem and are found in potato plants.
- Maize stem exhibits classical monocot vascular bundles.
Collateral and open vascular bundles comprise of procambium sandwiched between phloem and xylem and are usually found in dicot stems. Concentric vascular bundles are formed when one vascular tissue surrounds the other vascular tissue completely and are found in ferns. Radial vascular bundles are formed when xylem and phloem are arranged side to side and separated by non-vascular tissue and are found in monocot roots.
Hence, the mismatched pair is Bicollateral vascular bundles – Maize stem

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Anatomy of Flowering Plants Test - 62

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Anatomy of Flowering Plants Test - 62

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Question 1

Dicot root

Monocot root

Dicot stem

Monocot stem

Solution

Question 2

A-Protoxylem, B-Metaxylem, C-Phloem, D-Pericycle, E-Endodermis

A-Metaxylem, B-Protoxylem, C-Phloem, D-Percyicle, E-Endodermis

A-Protoxylem, B-Metaxylem, C-Phloem, D-Endodermis, E-Pericycle

A-Metaxylem, B-Protoxylem, C-Phloem, D-Endodermis, E-Pericycle

Solution

Question 3

Radial

Tangential

Central

Both (a) and (b)

Solution

Question 4

A

B

C

D

Solution

Question 5

lateral meristems

intercalary meristems

primary meristems

apical meristems.

Solution

Question 6

(i) and (iii)

(i) and (iv)

(iii) and (iv)

(ii) and (iii)

Solution

Question 7

(i) ring, pith; (ii) hypodermis

(ii) Casparian strips; (iii) unicellular

(i) ring, cortex; (iv) vascular bundles

(iii) multicellular; (iv) pith

Question 8

Parenchymatous, Collenchymatous

Collenchymatous, Sclerenchymatous

Sclerenchymatous, Collenchymatous

Sclerechymatous, Parenchymatous

Solution

Question 9

Phloem parenchyma is absent.

Vascular bundles are scattered, conjoint, collateral and closed

Each vascular bundle is surrounded by a bundle sheath.

Ground tissue is differentiated into cortex, endodermis, pericycle and pith

Solution

Question 10

Collateral and open vascular - Sunflower stem bundles

Bicollateral vascular bundles - Maize stem

Concentric vascular bundles - Ferns

Radial vascular bundles - Maize root

Solution

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