Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The root system is the part of the plant that grows below the soil and is responsible for absorbing and essential minerals from the earth.
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.
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.
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.
Roots provide anchorage to the plant, preventing it from being easily pulled out or blown away by wind.
📐Formulae
💡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 ( ).
Problem 3:
What are the primary substances absorbed by roots, and how are they represented chemically?
Solution:
Water and Minerals.
Explanation:
Roots absorb (water) and various dissolved minerals (like Nitrogen, Phosphorus, and Potassium) from the soil to facilitate plant growth and photosynthesis.