Root
Root is underground descending portion of the plants axis which is white or pale brown in color without nodes, internodes, leaves and buds. This note contains detail information about tap root and adventitious root system.
Summary
Root is underground descending portion of the plants axis which is white or pale brown in color without nodes, internodes, leaves and buds. This note contains detail information about tap root and adventitious root system.
Things to Remember
- Root is underground descending portion of the plants axis which is white or pale brown in color without nodes, internodes, leaves and buds.
- It helps in absorption of water and minerals from the soil and provides attachments for the plants.
- On germination of seed, the radical of embryo gives rise to the first root known as primary root which may or may not continues its growth.
- If the primary root continues to grow and give rise to a secondary and tertiary root successively than it is known as tap root system.
- If the primary root stops to grow and a cluster of roots arise from the base of the stem or from the parts other than radical of the embryo, then it is known as adventitious root system which may be underground or aerial in nature.
MCQs
No MCQs found.
Subjective Questions
Q1:
What do you mean by geography?
Type: Short Difficulty: Easy
Q2:
Give the location, size and boundary of Nepal.
Type: Long Difficulty: Easy
Q3:
Who are the main inhabitants of the Terai region?
Type: Short Difficulty: Easy
Q4:
The region of Terai is also called ‘Granary of Nepal’. Why?
Type: Short Difficulty: Easy
Q5:
What are the main sources of income of the people living in the Himalayan region?
Type: Short Difficulty: Easy
Q6:
What are the three major riverine divisions?
Type: Very_short Difficulty: Easy
<ul>
<li>Koshi Basin in the East</li>
<li>Gandaki Basin in the Center</li>
<li>Karnali Basin in the West</li>
</ul>
Q7:
What kind of climate is found in the Himalayan Region?
Type: Short Difficulty: Easy
Q8:
What percentage of the total area of the country is covered by the Hilly region?
Type: Short Difficulty: Easy
Q9:
Mention the physical divisions of Nepal.
Type: Short Difficulty: Easy
<ul>
<li>Terai region</li>
<li>Hilly region</li>
<li>Himalayan region</li>
</ul>
Videos
Physical features of Nepal
NEPAL- THE most beautiful country in the world ( visit nepal 2011)
Geography of Nepal
Himalayas, Nepal Most Beautiful Places In The World
Root
Root is the underground descending portion of the plants axis which is white or pale brown in color without nodes, internodes, leaves, and buds. It helps in absorption of water and minerals from the soil and provides attachments to the plants. It is positively geotropic, positively hydrotropic and negatively phototropic in nature. On germination of seed, the radical of embryo gives rise to the first root known as primary root which may or may not continues its growth. On the basis of persistence of primary root angiosperm root can be categorized into two types:
- Taproot
- Adventitious root
Taproot
If the primary root continues to grow and give rise to a secondary and tertiary root successively than it is known as tap root system. It is always underground and is the characteristic feature of dicotyledonous. In this case, the secondary roots grow in acropetal succession. Secondary roots away from the growing tip and younger towards the growing tip.
Adventitious root
If the primary root stops to grow and a cluster of roots arise from the base of the stem or from the parts other than radical of the embryo, then it is known as adventitious root system which may be underground or aerial in nature. It may arise from the base of the stem or from nodes and internodes of a stem, branches, and leaves.
A typical type of adventitious root is known as fibrous root which arises from the base of the stem or from the nodes of a horizontally growing stem which is always underground and is the characteristic feature of monocotyledon.
| Taproot | Adventitious root |
| Taproot system develops from the radicle of the embryo. | Adventitious root system develops from any part of the plant except radicle. |
| It is always underground. | It may be underground or aerial. |
| It consists of prominent root that gives many thin lateral branches. | It consists of a cluster of roots which may develop from the same point. |
| Primary root persists throughout the life of a plant. | Primary root is short-lived and is soon replaced by adventitious root. |
| It penetrates deep into the soil. | It does not penetrate deep into the soil. |
| Characteristics feature of a dicotyledon. | Fibrous root is a characteristic feature of monocotyledon, however, this root may be present in dicot. |
Lesson
Angiosperm
Subject
Biology
Grade
Grade 11
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