Problem 96 - Objective Biology for NEET

Question

The following are monocots except (a) Wheat (b) Maize (c) Sugarcane (d) Gram

Step-by-Step Solution

Answer

The correct answer is (d) Gram. It is not a monocot but a dicot.

Step 1: Identifying Monocots

Identify the monocots among the options. Wheat, Maize and Sugarcane are all monocots.

Step 2: Identifying the Exception

Considering the remaining option, Gram, which is a type of legume. Legumes fall under the category of dicots and not monocots. Therefore, Gram is not a monocot.

Key Concepts

Monocotyledons

Monocotyledons, often abbreviated to monocots, are one of the two major groups of flowering plants, found in the plant kingdom. These plants are characterized by having one embryonic seed leaf, or cotyledon, which typically becomes the primary leaf during germination. The term "mono" refers to "one," which helps remember that monocots have a single cotyledon.
Some common examples of monocotyledons include grasses such as wheat, maize, and sugarcane, as mentioned in the exercise.

• Leaves: Monocots have leaves with parallel venation, meaning the veins run side by side without intersecting.
• Roots: Their root system is typically fibrous, with many roots emerging from the base of the plant rather than a single main root.
• Flowers: The floral parts of monocots usually occur in multiples of three.
• Stems: The vascular bundles in monocot stems are scattered throughout, which means they do not have a clear arrangement.

Monocots are crucial in agriculture, providing essential crops such as rice, wheat, and corn, which form the staple diet for a significant portion of the world's population.

Dicotyledons

Dicotyledons, commonly referred to as dicots, form the other principal group of flowering plants. They possess two cotyledons or seed leaves, providing the "di" which denotes "two." This results in different structural characteristics compared to monocots.
Dicots include a wide range of plants, such as legumes, flowering shrubs, and most trees, like gram which is highlighted as a dicot in the exercise.

• Leaves: Dicots exhibit a net-like vein structure, which is often referred to as reticulate venation.
• Roots: They typically have a taproot system, with a central main root that grows deep into the soil.
• Flowers: Their floral parts are usually in multiples of four or five, adding to their distinctive appearance.
• Stems: Vascular bundles in dicot stems are organized in a circular pattern.

This group of plants is highly significant both ecologically and economically, encompassing many fruit-bearing and ornamental plants used by humans.

Plant Classification

Plant classification is a systematic approach to categorizing plants based on shared characteristics and traits, allowing for an organized understanding of the vast diversity in the plant kingdom. Flowering plants, known as angiosperms, are divided into two main groups: monocotyledons and dicotyledons.
The process of plant classification helps in identifying and understanding various plant species and their relationships.

• Monocotyledons: Known for having a single seed leaf and characteristics such as parallel leaf veins and scattered vascular bundles.
• Dicotyledons: Characterized by two seed leaves, with net-like leaf venation and circularly arranged vascular bundles.

This classification system aids botanists and horticulturists in determining the evolution, adaptation, and ecological roles of plants. By understanding these fundamental differences, one can easily identify plants and appreciate their biological diversity. Additionally, this knowledge is essential in agriculture, horticulture, and conservation efforts, as it influences the cultivation, usage, and protection of plant life.