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The Wonderful World of Plants - Roots: Taproot and Fibrous Roots

Grade 6CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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The root system is the part of the plant that grows below the soil and is responsible for absorbing H2OH_2O and essential minerals from the earth.

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Taproot System: This consists of one main, thick root called the primary root that grows vertically downwards. Smaller branches called lateral roots or secondary roots grow from it.

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Fibrous Root System: Instead of one main root, a cluster of thin, fiber-like roots of similar size emerges from the base of the stem. There is no primary root.

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Relationship with Venation: There is a direct correlation between the type of roots and leaf venation. Plants with taproots usually have reticulate venation, while plants with fibrous roots usually have parallel venation.

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Roots provide anchorage to the plant, preventing it from being easily pulled out or blown away by wind.

📐Formulae

Taproot  ⟹  Reticulate Venation\text{Taproot} \implies \text{Reticulate Venation}

Fibrous Roots  ⟹  Parallel Venation\text{Fibrous Roots} \implies \text{Parallel Venation}

Photosynthesis: 6CO2+6H2O→Sunlight/ChlorophyllC6H12O6+6O2\text{Photosynthesis: } 6CO_2 + 6H_2O \xrightarrow{\text{Sunlight/Chlorophyll}} C_6H_{12}O_6 + 6O_2

💡Examples

Problem 1:

A student observes a grass plant. Without pulling it out, how can the student predict the type of root system it has?

Solution:

By observing the leaf venation.

Explanation:

Grass leaves have parallel venation. According to the biological correlation, plants with parallel venation possess a fibrous root system. Therefore, the grass plant has fibrous roots.

Problem 2:

Identify the root type and venation for a Mustard plant.

Solution:

Root: Taproot; Venation: Reticulate.

Explanation:

Mustard is a dicotyledonous plant. It features a prominent primary root (Taproot) and leaves with a net-like pattern of veins (ReticulateReticulate VenationVenation).

Problem 3:

What are the primary substances absorbed by roots, and how are they represented chemically?

Solution:

Water and Minerals.

Explanation:

Roots absorb H2OH_2O (water) and various dissolved minerals (like Nitrogen, Phosphorus, and Potassium) from the soil to facilitate plant growth and photosynthesis.