Problem 81 - Objective Biology for NEET

Question

The plants requiring two metallic compounds (mincrals) for chlorophyll synthesis arc (a) \(\mathrm{Fe}\) and \(\mathrm{Ca}\) (b) \(\mathrm{Fe}\) and \(\mathrm{Mg}\) (c) Cu and \(\mathrm{Ca}\) (d) \(\mathrm{Ca}\) and \(\mathrm{K}\)

Step-by-Step Solution

Answer

The plants requiring two metallic compounds for chlorophyll synthesis are \(\mathrm{Fe}\) and \(\mathrm{Mg}\) (b).

Step 1: Understanding Chlorophyll and Photosynthesis

Chlorophyll is a pigment found in plants which are used in the process of photosynthesis to absorb light energy. This absorbed energy is then used to convert carbon dioxide and water into glucose and oxygen. Chlorophyll consists of a porphyrin ring, coordinated to a central atom. This is the essential part of a vast array of enzymes and proteins.

Step 2: Identifying the Metallic Compounds

The metallic compounds needed for chlorophyll synthesis are not directly mentioned in the question. According to plant biology, the central atom in a chlorophyll molecule is Magnesium (Mg) and Iron (Fe) plays a crucial role in the creation of chlorophyll as it is involved in the reaction taking place in chloroplasts. Therefore, the two metallic compounds necessary for the synthesis of chlorophyll in plants are \(\mathrm{Fe}\) and \(\mathrm{Mg}\).

Key Concepts

Photosynthesis

Photosynthesis is a fundamental process that occurs in plants, algae, and some bacteria. It allows these organisms to convert light energy, typically from the sun, into chemical energy stored in the form of glucose. During photosynthesis, carbon dioxide and water are transformed into oxygen and glucose using the energy captured by chlorophyll.
This entire process can be divided into different stages. Initially, light energy is absorbed by chlorophyll, the green pigment found in plant cells. This energy is then used to convert carbon dioxide and water products of this reaction are glucose, which serves as a source of energy for the plant, and oxygen, which is released into the atmosphere.
Photosynthesis is critical for life on Earth because it provides the oxygen we breathe and forms the base of the food chain by creating food resources for all living organisms. Without photosynthesis, life as we know it would not be possible, highlighting its pivotal role in maintaining ecological balance.

Metallic Compounds in Plants

Metals play a significant role in plant growth and development. Many metallic compounds are crucial for various physiological processes and are part of enzymes and proteins that drive these processes.

• First, metallic elements like magnesium and iron are essential for synthesizing chlorophyll, the key pigment involved in photosynthesis.
• These metals are vital for activating enzymes that participate in plant metabolism.
• In addition, metallic compounds impact the osmotic balance within plant cells, contributing to the plant's ability to absorb water and nutrients.

Understanding the role of metallic compounds helps us comprehend how plants grow, develop, and respond to their environment. It also aids in identifying deficiency symptoms and establishing effective fertilization practices.

Role of Magnesium and Iron in Plants

Magnesium and iron are two critical metallic elements that play a profound role in the health and development of plants, particularly in the synthesis of chlorophyll.
Magnesium serves as the central atom in the chlorophyll molecule, providing structural integrity. This means that without magnesium, plants cannot efficiently capture light energy necessary for photosynthesis. Magnesium is also involved in activating other enzymes that facilitate plant metabolism, impacting nutrient uptake and overall plant health.
Iron is another essential element, heavily involved in the synthesis of chlorophyll. While it is not a part of the chlorophyll structure itself, it is integral to enzymatic functions within chloroplasts, the site of photosynthesis. Iron helps in electron transport, which is vital for energy transfer during the photosynthesis process.
A deficiency in either of these elements can lead to poor plant growth and reduced photosynthetic efficiency. Iron deficiency typically manifests as chlorosis, where leaves turn yellow due to inadequate chlorophyll production, while magnesium deficiency can cause similar symptoms. Recognizing these roles highlights the necessity of maintaining adequate levels of these metals to ensure plant vitality and productivity.