Problem 21 - Objective Biology for NEET

Question

Marine algae used as food are (a) Laminaria (b) Sargassum (c) Porphyra (d) All of these

Step-by-Step Solution

Answer

All of the given marine algae, Laminaria, Sargassum, and Porphyra, are used as a food source. So, the correct answer is (d) All of these.

Step 1: Understanding Laminaria

Laminaria is a type of kelp and is found in the ocean. It is indeed edible and is a common ingredient in East Asian cuisine.

Step 2: Understanding Sargassum

Sargassum is a type of brown seaweed. It too is used in food in many cultures, particularly in the coastal regions.

Step 3: Understanding Porphyra

Porphyra is a type of red algae. It is known to be the seaweed used to make nori, which is used in sushi and other Japanese dishes. Therefore, Porphyra is also used as food.

Step 4: Final Answer

Since Laminaria, Sargassum, and Porphyra all are types of marine algae used as food, the correct answer is (d) All of these.

Key Concepts

Exploring the Culinary Uses of Laminaria

Laminaria, commonly referred to as kelp, is a nutritional powerhouse from the ocean, often incorporated into various Asian dishes. Its versatility in the kitchen is remarkable. It serves not only as a savory ingredient but also contains a wealth of vitamins and minerals, including iodine, which is crucial for thyroid function.

Often found in soups, salads, and even as a side dish, Laminaria has a distinct umami flavor. The mild taste and slightly chewy texture make it an appealing addition to meals. Furthermore, sustainability advocates frequently highlight the ecological benefits of integrating seaweeds like Laminaria into diets, as they require no arable land, fresh water, or fertilizers to thrive.

Cooking With Kelp

Traditional preparations involve drying and salting Laminaria for preservation. You might encounter it rehydrated in broths, adding a savory depth to the flavor profile of the broth. It's also used in making 'kombu', a key ingredient in 'dashi', a foundational stock in Japanese cooking.

Sargassum - More than Just Seaweed

Sargassum is a genus of brown macroalgae that floats in island-like masses and is often found in tropical oceans. Despite sometimes being associated with beach fouling, it plays a vital role in coastal ecosystems and is utilized in various regional cuisines.

Rich in nutrients, fiber, and antioxidants, Sargassum contributes distinct flavors and health benefits when added to the diet. Communities living near coastal areas sometimes collect the floating masses of Sargassum not just for food, but also for medicinal purposes, fertilizer, and even as feed in aquaculture. In terms of culinary use, it's sometimes pickled, added to salads, or processed into edible products.

From Sea to Table

In places where Sargassum is harvested for food, it undergoes thorough cleaning to remove salt and any ocean detritus. The prepared seaweed can then be used similarly to other types of algae, bringing a mild, ocean-like flavor to dishes.

Porphyra: The Seaweed Behind Sushi

Porphyra, commonly known in the culinary world as nori, is a type of red algae extensively cultivated in East Asia. Its prominence comes from its use in Japanese cuisine, particularly as the wrapping for sushi rolls. Porphyra has a crisp texture when dried and offers a salty taste, which complements the flavors of sushi rice and fresh fish.

Beyond sushi, Porphyra is also consumed as a snack, often toasted with soy sauce or other seasonings. It's rich in protein, vitamins (especially vitamin B12), and minerals, making it not just a favored ingredient but also beneficial for maintaining a balanced diet.

A Sea Vegetable Staple

Nori production is a sophisticated process. It involves the farming of Porphyra on nets suspended in the ocean, then harvesting, drying, and expertly cutting it into sheets. This dedication to quality and tradition ensures that nori continues to be an integral and cherished part of gastronomy.