Tag: botany

Questions Related to botany

Water containing Lysigenous cavity is present within the vascular bundles.

botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. Monocot stem

  2. Dicot stem

  3. Monocot root

  4. Dicot root

Show answer
Correct Option: A
Explanation:
The vascular bundle showing protoxylem vessels and parenchyma cell which dissolve leading to the formation of water cavity called lysigenous cavity such vascular bundles are found in monocot stem .
So the correct answer is A .

The stele found in monocot is:

botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. Haplostele

  2. Atactostele

  3. Dictyostele

  4. Actinostele

Show answer
Correct Option: B
Explanation:

The stele is the central part of the root and stem which contains tissues derived from the procambium, in monocots, the vascular bundles are scattered and the stele is an atactostele.

So, the correct option is 'Atactostele'.

Y-shaped arrangement of xylem vessels is found in
botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. Monocot stem

  2. Dicot stem

  3. Monocot root

  4. Dicot root

Show answer
Correct Option: A
Explanation:

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'

Lysigenous cavity in monocot stem vascular bundles develops by the dissolution of
botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. protoxylem

  2. metaxylem

  3. phloem

  4. ground tissue

Show answer
Correct Option: A
Explanation:

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'

Select the incorrect statement regarding the anatomy of a typical monocotyledonous stem
botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. Phloem parenchyma is absent.

  2. Vascular bundles are scattered, conjoint, collateral and closed

  3. Each vascular bundle is surrounded by a bundle sheath.

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

Show answer
Correct Option: D
Explanation:

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'

Schlerenchymatous hypodermis is found in?

botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. Dicot root

  2. Monocot leaf

  3. Dicot stem

  4. Monocot stem

Show answer
Correct Option: D
Explanation:
The sclerenchymatous hypodermis is present in a monocotyledonous stem. It is 2-3 layered thick and lies below type epidermis. It is made up of thick-walled lignified sclerenchyma fibers.

So, the correct answer is 'Monocot stem'.
Secondary growth usually does not occur in
botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. Stems and roots of dicots

  2. Stems and roots of gymnosperms

  3. Stems and roots of monocots

  4. Both (b) and (c)

Show answer
Correct Option: C
Explanation:

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'

The lacunae in the vascular bundles of monocot stem is

botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. A mucilage canal

  2. Protoxylem lacuna

  3. Lysigenous cavity

  4. Both B and C

Show answer
Correct Option: D
Explanation:

The first xylem formed is called as protoxylem. Protoxylem is later torn apart and a cavity is formed. The entire protoxylem is dissolved hence, such cavity is called as lysigenous cavity. The protoxylem shows an empty space, called as 'lacuna'. 

This type of intercellular space arises through dissolution of entire cells, which are therefore called as lysigenous intercellular spaces. These cavities of intercellular spaces store up water, gases and essential oils in them. The examples are commonly found in water plants and many monocotyledonous plants.

Transverse section of a material exhibits conjoint collateral endarch and closed bundles scattered in a ground tissue, what should be the material?

botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. Monocot root

  2. Dicot root

  3. Monocot stem

  4. Dicot stem

Show answer
Correct Option: C
Explanation:

Monocot stem vascular bundles are found irregularly scattered in the ground tissue. 

Towards the periphery, the bundles are smaller in size while towards the centre, they are larger in size. The smaller bundles are younger, while the larger ones are older. Hence, the arrangement is described as endarch. 
Each vascular bundle has a covering called bundle sheath formed by a single layer of sclerenchyma cells. The vascular bundle encloses both xylem and phloem. Xylem is found towards the inner surface and phloem towards the outer surface. Cambium is absent. Hence the vascular bundles are described as conjoint, collateral and closed. 
Dicot stem vascular bundles are eight in number, arranged in form of a broken ring. The vascular bundles are conjoint, collateral and open. Xylem is on the inner surface and phloem on the outer surface. Xylem is described as endarch. 
Dicot root vascular bundles are described as radial, open and tetrarch. There are four bundles each of xylem and phloem occurring alternately. Xylem is described as exarch. 
Monocot root vascular bundles are radial in arrangement. There are eight bundles each of xylem and phloem. Hence, the condition is described as polyarch. Xylem is described as exarch. 

T.S. of a material exhibits conjoint collateral endarch and closed bundles scattered in a ground tissue. What should be the material?

botany internal structure of root, stem and leaf internal structure of monocot stem internal structure of monocots internal structure of stem(dicot and monocot)

  1. Monocot root

  2. Dicot root

  3. Monocot stem

  4. Dicot stem

Show answer
Correct Option: C
Explanation:

Monocot stem vascular bundles are found irregularly scattered in the ground tissue. Towards the periphery, the bundles are smaller in size while towards the centre, they are larger in size. The smaller bundles are younger, while the larger ones are older. Hence, the arrangement is described as endarch. 

Each vascular bundle has a covering called bundle sheath formed by a single layer of sclerenchyma cells. The vascular bundle encloses both xylem and phloem. Xylem is found towards the inner surface and phloem towards the outer surface. Cambium is absent. Hence the vascular bundles are described as conjoint, collateral and closed. 
Dicot stem vascular bundles are eight in number, arranged in form of a broken ring. The vascular bundles are conjoint, collateral and open. Xylem is on the inner surface and phloem on the outer surface. Xylem is described as endarch. 
Dicot root vascular bundles are described as radial, open and tetrarch. There are four bundles each of xylem and phloem occurring alternately. Xylem is described as exarch. 
Monocot root vascular bundles are radial in arrangement. There are eight bundles each of xylem and phloem. Hence, the condition is described as polyarch. Xylem is described as exarch.