Problem 60 - Objective Biology for NEET

Question

Floridean starch is stored food found in (a) Some protist (b) Some bryophytes (c) Some algae (d) Prokaryotes

Step-by-Step Solution

Answer

The Florida starch is stored in 'Some algae'

Step 1: Understanding Floridean Starch

Floridean starch is a polysaccharide reserve carbohydrate, which is found in the cytoplasm, or sometimes the chloroplasts, of red algae cells.

Step 2: Matching the Organisms

Now, scan through the options given in this exercise - protists, bryophytes, algae and prokaryotes. Understand the basic natures of these organisms and find the correlation between the known about Floridean starch and these categories.

Step 3: Choosing the Correct Option

As Floridean starch is found in red algae, look for the option that relates to algae. Out of the options given, only the option 'Some algae' matches with the fact that Floridean starch is found in red algae cells. The other options — protists (a diverse collection of organisms), bryophytes (non-vascular plants), and prokaryotes (organisms without a nucleus) — are not as closely related to Floridean starch as algae.

Key Concepts

Red Algae

Red algae, scientifically known as Rhodophyta, are predominantly marine organisms that contribute significantly to the biodiversity of oceans. They are so named because of the presence of the pigment phycobiliproteins, which gives them their distinctive red color. This pigment allows red algae to absorb blue light and inhabit deeper waters than most other photosynthetic organisms can survive in.

Among their unique features is the ability to produce a special type of starch, known as Floridean starch, which acts as their storage polysaccharide. Unlike the starch found in plants and green algae, which is typically stored in plastids, Floridean starch is located in the cytoplasm of red algae cells. The existence of this starch is integral to the survival of these organisms, providing energy reserves to fuel various cellular activities, particularly when environmental conditions are less than favorable for photosynthesis.

Polysaccharide Reserve Carbohydrates

Polysaccharides are complex carbohydrates that play a pivotal role as energy storage in various organisms. Polysaccharide reserve carbohydrates are long chains of monosaccharide sugars linked together and act as a reserve of energy that can be tapped during times when immediate fuel is needed.

In the context of red algae, Floridean starch is the specific type of polysaccharide reserve carbohydrate that they accumulate. Its structure is somewhat similar to that of amylopectin, one of the two components of starch in plants; however, the branching patterns and enzymes responsible for its synthesis and breakdown are distinctly different. For students exploring biological molecules in algae, understanding the unique properties of these polysaccharides is crucial as they provide insight into the metabolism and evolutionary adaptations of different species.

Biological Molecules in Algae

Algae, diverse and widespread in water ecosystems, consist of a myriad of biological molecules that facilitate their survival. These include proteins, lipids, nucleic acids, and a variety of carbohydrates. In the case of red algae, their most notable carbohydrate is Floridean starch — a storage molecule that plays a similar role to glycogen in animals or starch in plants.

Aside from storage polysaccharides like Floridean starch, algae also contain structural polysaccharides such as cellulose in their cell walls, and many produce unique secondary metabolites which can have antimicrobial, antifungal, or other biologically active properties. Thus, the study of biological molecules in algae is not only fundamental to understanding their biology but also has potential applications in biotechnology and medicine.