Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 63

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Question 1
1 / -0

Select the correct option:
Read the following statements and select the correct option.
Statement 1: Anatomically, all the tissues present on the inner side of endodermis such as pericycle, vascular bundles and pith constitute the stele.
Statement 2: Eustele is the stele in which vascular bundles are arranged in the form of a ring as present in dicot stems,

A
Both statements $$1$$ and $$2$$ are correct

B
Statements $$1$$ is correct but statement $$2$$ is incorrect

C
Statement $$1$$ is incorrect but statement $$2$$ is correct

D
Both statements $$1$$ and $$2$$ are incorrect

Solution
Question 2
1 / -0

Vascular bundle is enclosed within a well developed sclerenchymatous sheath in

A
Monocot stem

B
Dicot stem

C
Monocot root

D
Dicot root

Solution

In most monocot stems, a sclerenchymatous bundle sheath is present on the outside of each vascular bundle. ( as shown in the image)
So, the correct answer is (A).
Question 3
1 / -0

Well developed pith is found in

A
Monocot root and monocot stem

B
Monocot stem and dicot root

C
Monocot root and dicot stem

D
Dicot root and dicot stem

Solution

Well developed pith or parenchymatous central region is present in monocot root (maize) and dicot stem (Sunflower). Its a structure of loosely arrannged cells that embeds vascular tissue, it may store food.
So, the correct answer is 'Monocot root and dicot stem'
Question 4
1 / -0

Select the correct option:Figures X and Y represent the transverse sections of _______ and ________ respectively.
X Y
(A) dicot root - dicot stem
(B) monocot root - monocot stem
(C) dicot stem - monocot stem
(D) monocot stem - dicot stem

A
A

B
B

C
C

D
D
Solution
- Figures X and Y represent the transverse sections of dicot stem and monocot stem respectively.
- Both stems and roots contain vascular tissues (xylem and phloem), the circulatory system of the plant. In stem, the vascular tissues are contained in bundles and these bundles sit relatively near the surface of the stem. In roots, the vascular tissues are found at the centre.
- In dicot stem, vascular bundles are arranged in a ring whereas vascular bundles are scattered in monocot stem as shown in the above figure.
- So the correct option is C
Question 5
1 / -0

Bicollateral vascular bundles are found in

A
Helianthus

B
Zea mays

C
Cucurbita

D
Dracaena
Solution
Correct Option: C
Explanation:
Bicollateral vascular bundles are a form of a conjoint vascular bundle found in the stem, with the xylem located in the inner strand of the phloem.
Herbaceous climbing and trailing plants make up the Cucurbitaceae family.
Herbs are either annual or perennial. Bicollateral vascular bundles are those that have phloem on both sides of the xylem.
In this form of stem bundle, phloem is found above (external to) the metaxylem and below (internal to) the protoxylem parts.
Plants in the Cucurbitaceae, Solanaceae and other families have this type of vascular bundle.
Hence, bicollateral vascular bundles are found in Cucurbita.
Question 6
1 / -0

Identify P, Q, R, S and T in the given T.S. of dicot stem showing secondary growth and select the correct option

A
P-Primary phloem, Q-Primary xylem, R-Vascular cambium, S-Secondary xylem, T-Secondary phloem

B
P-Secondary xylem, Q-Primary xylem, R-Secondary phloem, S-Primary phloem, T-Vascular cambium

C
P-Primary xylem, Q-Secondary xylem, R-Vascular cambium, S-Secondary phloem, T-Primary phloem

D
P-Primary xylem, Q-Secondary xylem, R-Vascular cambium, S-Primary phloem, T-Secondary phloem

Solution

P - Primary xylem -  is the xylem that is formed during the primary growth from procambium of apical meristems.
Q - Secondary xylem -  is the type of xylem formed from secondary growth.
R - Vascular cambium -  is the main growth tissue in the stems and roots.
S - Secondary phloem - is a type of phloem that forms from the vascular cambium during the secondary growth.
T - Primary phloem - is a type of phloem that forms from the procambium during the primary growth.
So, the correct answer is (c).
Question 7
1 / -0

Which of the following statements is incorrect?

A
In a dicot stem, the pericycle is usually multiplayered

B
Wood is the common name used for secondary xylem

C
Peripheral cytoplasm, a large vacuole and a prominent nucleus; all are absent in a mature sieve tube element

D
Lenticels are the aerating pores present in bark of plants and are associated with gaseous exchange

Solution

The cells of the seive tube elements contains protoplasm. a large vacuole however nucleus is lost at maturity. The conduction of food material takes between the cells through seive plants. The flow of food (sucrose), its loading etc is controlled by companion cells. Each seive tube cell is associated with one companion cell.
So, the correct answer is 'Peripheral cytoplasm, a large vacuole and a prominent nucleus; all are absent in a mature sieve tube element'
Question 8
1 / -0

Lysigenous cavity in monocot stem vascular bundles develops by the dissolution of

A
protoxylem

B
metaxylem

C
phloem

D
ground tissue

Solution

In monocot stem (Maize), the xylem appears Y shaped. The lowermost or innermost protoxylem undergoes disintegration to produce lysigenous cavities also called the protoxylem lacuna.
So, the correct answer is 'protoxylem'
Question 9
1 / -0

Read the following statements and select the correct option.

Statement 1: Annual rings are distinct in plants growing in temperate regions
Statement 2: In temperate regions, the climatic conditions are not uniform through the year

A
Both statements $$1$$ and $$2$$ are correct

B
Statements $$1$$ is correct but statements $$2$$ is incorrect

C
Statement $$1$$ is incorrect but statement $$2$$ is correct

D
Both statements $$1$$ and $$2$$ are incorrect

Solution

More distinct annual rings are formed in that regions, where climatic variations are sharp. More distinct annual rings are formed in temperate plants as the climatic conditions of temperate regions are not uniform.
Thus, both the statements are correct.
So, the correct option is (A).
Question 10
1 / -0

Secondary growth usually does not occur in

A
Stems and roots of dicots

B
Stems and roots of gymnosperms

C
Stems and roots of monocots

D
Both (b) and (c)

Solution

Stems of monocots do not have lateral or secondary cambium. Roots of both monocots and dicots do not have secondary or lateral cambium. Hence, true secondary growth does not occur in stems and roots of monocots. But, in some exceptional cases if secondary growth takes place due to dedifferentiation of tissue cells of the cortex, pericycle etc into meristematic tissue this type of secondary growth is called anomalous secondary growth.
So, the correct answer is 'Stems and roots of monocots'