Question

types of root and their examples

Answer 1

There are 2 types of root systems :
a) Tap root system
b) Fibrous root system

a)Tap root system is a system in which there is a large,central root from which other root sprouts emerge.
It is mostly found in dicot plants.
eg. mango,carrot,beetroot etc.

b)Fibrous root system is opposite of tap root system.
It has thin small roots emerging directly from stem.
There is no dominant root like in tap root system.
It is mainly found in monocot plants.
eg. Grass,wheat,banana,onion etc.

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Answer 2

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Fibrous roots
Some plants have small, thin roots, all of the same length.

• These roots form a tuft, as for instance the roots of onion, rice, millet, maize.



Rice has fibrous roots

• A plant that has many small roots of the same length, the same thickness, the same shape, has fibrous roots.




Creeping roots
Some plants have roots that are shallow and long.

• Creeping roots do not go deep into the soil.

• These roots go a long way from the base of the plant.

They cover a large area.

They have to find in a small depth of earth the food necessary for the life of the plant.

Many trees have creeping roots.



Creeping roots

• A plant that has shallow, very long roots has creeping roots.




Tap-roots
Some plants have only one root, very thick, deep, straight, called a tap- root.

• Smaller roots grow on this thick root; they are called rootless.

• Tap-roots go deep into the soil.

They cannot penetrate soil that is too hard.



Types of tap root

• Cotton, coffee, cocoa, okra, carrots, papayas all have a root that goes deep into the soil, is very thick and straight.

They have a tap- root.




Tuberous roots
Some plants have very thick roots.

• These roots store up food.

• These roots are thick because they have taken up a lot of food from the soil.

The food is stored up in order to feed the whole plant.

The plant is said to have built up reserves.

For example, cassava.



Cassava roots

• A plant that stores up reserves in thick roots has tuberous roots.




Adventitious roots
In some plants roots start from the stem above the soil, that is, above the collar, and afterwards go down into the earth.

• Adventitious roots grow above the collar.

For example, mangrove, bamboo, maize and rice all have adventitious roots.



A rice plant

• Soil put around the collar helps adventitious roots to grow; the plant is earthed up.

• A plant with roots on the stems has adventitious roots.



Earthing up encourages adventitious roots to develop


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