Problem 109 - Objective Biology for NEET

Question

The name 'Auxin' was given to which chemical? (a) Indole-3-acetic acid (b) Indole-6-acetic acid (c) Indole-3-butyric acid (d) Indole-6-butyric acid

Step-by-Step Solution

Answer

The correct answer is (a) Indole-3-acetic acid.

Step 1: Recall and Identify

This problem doesn't require any calculations or complex processing - it's a matter of recalling and identifying the correct information. When one sees the term 'Auxin', the associated chemical name should come to mind. When one looks at the options provided, the correct choice should be immediately recognizable if one remembers that 'Auxin' is a name given to 'Indole-3-acetic acid'.

Key Concepts

Indole-3-acetic acid

Indole-3-acetic acid, often abbreviated as IAA, is a naturally occurring plant hormone that falls under the category of auxins. Auxins are essential for plant growth and development, influencing various physiological processes. IAA specifically plays a crucial role in cell elongation, which helps plants grow taller and their stems become stronger.
IAA is produced in the meristematic regions of plants like the tips of roots and shoots. It influences cellular elongation by relaxing the cell walls, allowing cells to expand. This occurs when IAA stimulates the production of enzymes, such as expansins, which loosen the bonds between cellulose fibers in the plant cell wall.
Furthermore, IAA assists in the differentiation of various plant tissues. It regulates the expression of genes involved in these processes, integrating signals from both internal and external environments. By doing so, IAA contributes to the plant's overall structural formation and adaptability to its surroundings.

Plant hormones

Plant hormones are chemical messengers that regulate plant growth, development, and responses to stimuli. Also known as phytohormones, these substances operate in very low concentrations but have a profound impact on plant physiology.
They include several major classes, among which auxins (like Indole-3-acetic acid), gibberellins, cytokinins, ethylene, and abscisic acid are most significant.

• Auxins: Key for growth directionality and cell elongation.
• Gibberellins: Important in seed germination, flowering, and stem growth.
• Cytokinins: Promote cell division and expansion.
• Ethylene: Influences fruit ripening and leaf abscission.
• Abscisic Acid: Plays a role in stress responses and seed dormancy.

These hormones often work synergistically or antagonistically to maintain plant homeostasis and adapt to environmental changes. Crosstalk among hormones fine-tunes these responses, ensuring plants grow properly and survive various stress conditions.

Biology education

Biology education, especially in the context of plant physiology and hormones, offers insights into how life operates at a cellular and organismal level. Understanding key concepts like the functions of Indole-3-acetic acid and other plant hormones helps students appreciate the complexity and marvel of botanical life.
In educational settings, using simple, relatable examples assists in demystifying these concepts. For instance, explaining how auxins cause the bending of plants towards light can make the idea of phototropism more tangible.

• Engaging Teaching Methods: Utilizing diagrams, animations, or even hands-on experiments can make learning enjoyable and effective.
• Contextual Learning: Relating plant hormones to real-world scenarios, such as agricultural practices, can foster practical understanding and relevance.
• Interactive Activities: Encouraging discussions, problem-solving, and group projects can enhance critical thinking.

By incorporating such strategies, biology education can empower students to understand and explore the natural world, motivating interest and fostering scientific curiosity.