Tag: internal structure of root(dicot and monocot)

Questions Related to internal structure of root(dicot and monocot)

Passage cells occur in

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

  1. Monocot root

  2. Dicot root

  3. Monocot stem

  4. Aerial root

Show answer
Correct Option: A,B
Explanation:

Endodermal cells without casparian strips or bands are called passage cells. These are present opposite to the protoxylem cells. These are found in both dicot root and monocot root.

So, the correct option is 'Monocot root & dicot root'.

As compared to a dicot root, a monocot root has

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

  1. More abundant secondary xylem

  2. Many xylem bundles

  3. Inconspicuous annual rings

  4. Relatively thicker periderm

Show answer
Correct Option: B
Explanation:

The anatomy of dicot root differs from monocot root, in activity of pericycle, no. of xylem strands, presence of medulla, activity of conjunctive tissue.  

In dicot root, pericycle is involved in the formation of lateral roots and vascular cambiu, where as in monocot root, pericycle is involved in the formation of lateral roots. 
In dicot root 2 to 4 xylem strands are present in the stele, where as monocot root more than 4 xylem strands are present.
In dicot root, medulla is reduced, where as in monocot root medulla is well developed.
In dicot root, conjunctive tissue involved in the formation of vascular cambium, where as in monocot root, it is not involved in the formation of vascular cambium.
So, the correct option is 'Many xylem bundles'.

Out of the following, how many features belong to monocot root? 
1. Radial vascular bundles 
2. Closed vascular bundles
3. Endodermis absent
4. Pith developed
5. Polyarch condition

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

  1. One

  2. Two

  3. Three

  4. Four

Show answer
Correct Option: D
Explanation:
When xylem and phloem within a vascular bundle are arranged in an alternate manner on different radii, then it is called Radial vascular bundles. It is true for monocot roots.
When there is no cambium present between the xylem and phloem elements, the bindle is said to be Closed vascular bundles.It is true for monocot roots.
Endodermis is very distinct in monocot root.Hence, sentence number 3 does not belong to the features of monocot root.
Pith is large and well developed in roots of monocotyledonous plants.
Monocot root comprises of more than six xylem bundles i.e. Polyarch condition.
So, the correct option is 'Four'

Which of the following is seen in a monocot root?

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

  1. Large pith

  2. Vascular cambium

  3. Endarch xylem

  4. Medullary ray

Show answer
Correct Option: A
Explanation:

In monocot root, the vascular bundles are usually more than six in number. Pith is large and parenchymatous. The parenchyma of the pith become lignified and sclerenchymatous.