Tag: anatomy of stem

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Multiple choice botany internal structure of root, stem and leaf internal structure of dicot stem internal structure of stem(dicot and monocot) anatomy of stem

In dicot stem, lateral branch comes out from 

  1. Pericycle

  2. Cortex

  3. Pith

  4. Epidermis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In dicot stem, the lateral branches are exogenous in origin and they come out from the cortex of the stem. However, in dicot root, the lateral roots are endogenous in origin because they come out from the pericycle of the stem.

A. Pericycle gives rise to the lateral roots.
B. Cortex gives rise to the lateral branches in stem.
C. Pith is a storage organ.
D. Epidermis gives rise to scales and trichomes.
Hence, the correct answer is 'Cortex'

Multiple choice botany internal structure of root, stem and leaf internal structure of dicot stem internal structure of stem(dicot and monocot) anatomy of stem

In young dicot stem, cambium is

  1. Single layered

  2. Double layered

  3. Multilayered

  4. Absent
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a young dicot stem, the cambium is single layered. It is made by the intrafascicular cambium present within the vascular bundles and the dedifferentiation of the parenchyma cells of the medullary rays between the vascular bundles, called interfascicular cambium. Their combination gives a circular cambium that produces xylem elements on the inner side and the phloem elements on the outer side.

Hence, the correct answer is 'Single layered'

Multiple choice botany internal structure of root, stem and leaf internal structure of dicot stem internal structure of stem(dicot and monocot) anatomy of stem

In dicot stem, cork cambium develops in 

  1. Epidermal region

  2. Cortical region

  3. Stelar region

  4. Vascular region
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cork cambium is secondary or lateral meristematic tissue that grows beneath the epidermis and replaces it in dicot roots and stems and is responsible for the secondary growth of the tree.

So the correct option is 'Epidermal layer'

Multiple choice botany internal structure of root, stem and leaf internal structure of dicot stem internal structure of stem(dicot and monocot) anatomy of stem

The nature of pericycle above the phloem in dicot stem is 

  1. Parenchymatous

  2. Sclerenchymatous

  3. Collecnchymatous

  4. Chlorenchymatous
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pericycle is a thin layer located between the endodermis and phloem in plant roots. In dicot stems, it is located around the ring of vascular bundles in the stele. The nature of pericycle is sclrenchymatous. 

Thus, the correct answer is 'Sclerenchymatous.'

Multiple choice botany internal structure of root, stem and leaf internal structure of dicot stem internal structure of stem(dicot and monocot) anatomy of stem

Ploem fibre (Bast fibre) are generally absent in 

  1. Dicot

  2. Primary Phloem

  3. Secondary Phleom

  4. Both (2) and (3)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bast fibers are made up of sclerenchymatous cells and are absent in primary phloem but present in secondary phloem of dicots and are elongated , unbranched and have pointed needle like apices and are devoid pf protoplasm at maturity and dead.

So the correct option is 'Primary Phloem'.

Multiple choice botany internal structure of root, stem and leaf internal structure of dicot stem internal structure of stem(dicot and monocot) anatomy of stem

Which of the following statement is incorrect?

  1. In a dicot stem, the pericycle is usually multilayered

  2. Wood is the common name used for secondary xylem

  3. Peripheral cytoplasm, a large vacuole and a prominent nucleus: all are absent in a mature sleve tube elements

  4. Lenticels are the aerating pores present in bark of plants and are associated with gaseous exchange
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Pericycle is a cylinder of parenchymal and sclerenchyma cells which lie just below the endodermis of the plants. 
  • In dicot stem, the pericycle is heterogenous made of parenchyma and sclerenchyma alternatively in irregular patches but they are not multilayered.
  • So, the correct answer is 'In a dicot stem, the pericycle is usually multilayered'.
Multiple choice botany internal structure of root, stem and leaf internal structure of dicot stem internal structure of stem(dicot and monocot) anatomy of stem

Casparian strips occur in

  1. Radial walls of endodermis

  2. Radial walls of phellem cells

  3. Radial walls of epidermal cells

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Casparian strips occur in radial walls of endodermis. The Casparian strip is a band of cell wall material deposited on the radial and transverse walls of the endodermis, and is chemically different from the rest of the cell wall - the cell wall being made of lignin and without suberin - whereas, the Casparian strip is made of suberin and sometimes lignin. It blocks the passive flow of materials such as water and solutes into the stele of a plant.
Thus, the correct answer is option A.

Multiple choice botany internal structure of root, stem and leaf internal structure of dicot stem internal structure of stem(dicot and monocot) anatomy of stem

Distinguishing feature of closed vascular bundle is

  1. Presence of cambium

  2. Absence of cambium

  3. Ring of vascular bundles

  4. No vascular bundles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Open vascular bundle contains an interfascicular cambium in between phloem and xylem. Phloem and xylem are not in direct contact with each other. 

In closed vascular bundle interfascicular cambium is absent. There is direct contact between phloem and xylem.