Tag: internal structure of root, stem and leaf

Questions Related to internal structure of root, stem and leaf

Cambium found in vascular bundles of dicot 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. Intercalary meristem

  2. Fascicular cambium

  3. secondary meristem

  4. All of the above

Show answer
Correct Option: B
Explanation:
Fascicular cambium is present in vascular bundles of dicot stem.  It is present between xylem and phloem of vascular bundle. 
So, the correct answer is 'Fasicular cambium'

Atactostele 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 stem

  2. Monocot stem

  3. Dicot root

  4. Monocot root

Show answer
Correct Option: B
Explanation:

Atactostele is a type of eustele, found in monocots, in which the vascular tissue in the stem exists as scattered bundles. Most seed plant stems possess a vascular arrangement, which has been interpreted as a derived siphonostele and is called as eustele. There is also a variant on the eustele found in monocots, like maize and rye. The variation has numerous scattered bundles in the stem and is called as an atactostele.

The stele present in Equisetum 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. Actinostlele

  3. Plectostele

  4. Siphonostele

Show answer
Correct Option: D
Explanation:

  1. Haplostele consist of smooth ore of xylem which is surrounded by a phloem ring.ex-Seleginella
  2. Actinostele consist of star shape xylem core with many radiating arms.ex-Lycopodium
  3. Plectostele consist of xylem core broken into a number of parallel plates.ex-Lycopodium clavatum
  4. Siphonostele is a protostele with central pith and considered to be the most advance stele.ex-Equisetum.
So the correct option is "Siphonostele".

Which of the following tissue is absent in vascular bundles of monocot 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. Xylem

  2. Phloem

  3. Cambium

  4. All of the above

Show answer
Correct Option: C
Explanation:

In monocots, xylem and phloem are organized in vascular bundles scattered throughout the stem. As the plant grows, monocot stems generate new vascular bundles for the new tissue. Monocot stems in general possess a simpler arrangement than that found in dicots; the main elements of the stem are merely the vascular bundles and the pith that surrounds them.

Which of the following would you consider to prove that a plant is a monocot?

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. Leaves with reticulate venation

  2. Taproot system

  3. Vascular bundles are closed

  4. Presence of cambium

Show answer
Correct Option: C
Explanation:

In the monocots, the vascular bundles are of the collateral and closed type. The closed vascular bundles lack the cambium and cannot show secondary growth. In the stem, vascular bundles are found scattered in the ground tissue. They are more in number at the periphery as compared to the centre. In the monocot roots, the vascular bundles are closed type an found in the stele.

Conjoint and closed vascular bundles with no phloem parenchyma may be observed 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. Monocot root

  3. Dicot stem

  4. Dicot root

Show answer
Correct Option: A
Explanation:

In monocot stem, all the vascular bundles, the xylem and phloem are in the same line; cambium is absent; phloem is external to xylem; protoxylem faces the centre. Hence, the vascular bundles are described as conjoint, collateral, endarch and closed.  

Hypodermis in monocotyledonous 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. Parenchymatous

  2. Chlorenchymatous

  3. Collenchymatous

  4. Sclerenchymatous

Show answer
Correct Option: D
Explanation:

The region present below the epidermis in monocot stem is hypodermis. It is composed with sclerenchyma. Sclerenchyma is dead mechanical tissue. It provides mechanical strength to the stem.

So, the correct option is 'Sclerenchyma’.

In monocot stem, which among the following is absent?

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. Endodermis

  2. Hypodermis

  3. Cortex

  4. Both A and B

Show answer
Correct Option: A
Explanation:

In monocot stem, the endodermis is absent. It has a single layer epidermis. The vascular bundles are scattered.

Thus, the correct answer is option A.

T.S. of stem of Cucurbita can be identified from the T.S. of sunflower stem by the presence 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. Bicollateral vascular bundles

  2. Conjoint vascular bundles

  3. Scattered vascular bundles

  4. Cambium in the vascular bundles

Show answer
Correct Option: A
Explanation:

The vascular bundles of cucurbita are many, conjoint, bicollateral, regularly arranged forming a broken ring or scattered in ground tissue and are endarch.

Undifferentiated ground tissue is present in stem 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. Sunflower

  2. Pisum

  3. Maize

  4. Cucurbita

Show answer
Correct Option: C
Explanation:

A.Sunflower – Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

B.Pisum - Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

C.Maize – Ground tissue is undifferentiated.

D.Cucurbita - Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

So, the correct option is ‘Maize’.