Problem 24 - Objective Biology for NEET

Question

Carrageen is secreted by (a) All of the algae (b) Only brown algae (c) Only red algae (d) Both red and brown algae

Step-by-Step Solution

Answer

The correct answer is (c) Only red algae.

Step 1: Understanding the Question

The question asks for the type of algae that produce carrageen, a substance used in various applications. Carrageen is known to be secreted by certain algae.

Step 2: Recalling Knowledge about Algae

To answer the question, it's crucial to remember the specifics about different types of algae. The three options presented are that all algae secrete carrageen, only brown algae do, only red algae do, or both red and brown algae do. It's necessary to know which is correct.

Step 3: Deciding the Correct Option

From the existing knowledge about algae, it is known that red algae are the primary source of carrageen. Thus, the correct option should be (c) Only red algae.

Key Concepts

Red Algae

Red algae, or Rhodophyta, are notable for their distinctive pigment composition, which includes chlorophyll a, phycobiliproteins, and various carotenoids, lending them their characteristic color. They thrive in both marine and freshwater environments and play a critical ecological role. Beyond their biological significance, these algae have a profound impact on human industry.

One remarkable aspect of red algae is their ability to produce bioactive compounds, one of which is carrageenan. Carrageenan is a sulfated polysaccharide found in the cell walls of red algae, especially in species like Chondrus crispus. This substance is widely utilized in the food industry for its gelling, thickening, and stabilizing properties. It also finds applications in cosmetics and pharmaceuticals for its binding and emulsifying abilities. Red algae's unique biochemistry positions it as a key player in biotechnological research and sustainable resource discussions.

Algal Biochemistry

Diving deeper into the algal biochemistry, especially concerning substances like carrageenan, reveals the complexity and diversity of these organisms. Algae possess a metabolic network that allows them to synthesize a wide array of polysaccharides, which serve various structural and functional roles within the cells.

In red algae, the biosynthesis of carrageenan involves a series of enzymatic reactions that are specialized for the production of this compound. The presence of sulfate groups in carrageenan is particularly interesting, as it influences the physical properties such as gel-strength and melting temperatures. Understanding the biochemical pathways in algae not only facilitates better utilization of these organisms but also enhances our ability to replicate or modify these compounds for specific commercial needs. This knowledge is integral to fields like food science, materials science, and even energy, where algal biofuels are an area of significant interest.

Biology NEET Exam

For students preparing for competitive exams like the NEET (National Eligibility cum Entrance Test), topics such as algal biochemistry form an important component of the biology syllabus. These exams evaluate a student's understanding of plant diversity and the ecological significance of various groups, including algae.

In addition to the biological roles, NEET aspirants are expected to be familiar with the economic importance and applications seen in human industries, making carrageenan's production by red algae a pertinent detail. Questions related to these topics often require an integration of a deep conceptual understanding with practical knowledge of applications. It is therefore advisable for students to strengthen their grasp of algal biochemistry, as it can help them tackle a broad spectrum of questions in the biology section of the NEET exam efficiently.