Which among the following is incorrect about tap root and fibrous root...
- Tap root grows deep into the soil.
- Fibrous root grows laterally in the soil.
- In tap root system, one primary root and more than one secondary root is present.
- Most of the dicotyledons adopt tap root system.
Which among the following is incorrect about tap root and fibrous root...
Incorrect Statement: In fibrous root system, one primary root and more than one secondary root is present
Explanation:
Fibrous Root System:
- In a fibrous root system, there is no single dominant root like in the taproot system. Instead, there are multiple roots of similar size and length.
- These roots arise from the base of the stem and spread out in different directions, forming a dense network.
- The primary root in the fibrous root system does not persist as a main root and does not grow significantly.
- The roots in the fibrous root system are adventitious roots, which means they develop from the stem rather than the radicle (embryonic root).
- The fibrous root system is typically found in monocotyledonous plants such as grasses, maize, wheat, rice, etc.
Correct Statements:
a) Tap root grows deep into the soil:
- In a taproot system, there is a large, dominant primary root that grows vertically downward into the soil.
- The primary root gives rise to secondary and tertiary roots, which also grow vertically into the soil.
- Taproots are generally found in dicotyledonous plants such as carrots, radishes, dandelions, etc.
- The taproot system allows plants to penetrate deep into the soil, providing stability and access to nutrients and water present at greater depths.
c) Fibrous root grows laterally:
- As mentioned earlier, fibrous roots in the fibrous root system spread out horizontally from the base of the stem.
- These roots do not grow deep into the soil but rather form a dense network close to the soil surface.
- This lateral growth of fibrous roots helps in anchoring the plant and absorbing nutrients from a larger soil area.
d) Most of the dicotyledons adopt tap root system:
- It is true that most dicotyledonous plants have a taproot system.
- The taproot system is advantageous for dicots as it allows them to grow deep into the soil, providing better support and greater access to nutrients and water.
- However, there are exceptions where dicots also have a fibrous root system, such as some species of milkweed (Asclepias) and certain legumes.
In conclusion, the incorrect statement is option 'B' because a fibrous root system does not have a primary root and multiple secondary roots. Instead, it consists of multiple similar-sized roots that form a dense network.
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