Problem 62 - Objective Biology for NEET

Question

Which is not a correct matching? (a) Rust \(\rightarrow\) Puccinia (b) Yeast \(\rightarrow\) Bread and beer (c) Chrysophyte \(\rightarrow\) Diatomaceous earth (d) Penicillium \(\rightarrow\) Red tide

Step-by-Step Solution

Answer

The incorrect matching is (d) Penicillium \(\rightarrow\) Red tide.

Step 1: Examine Choice A

Rust is a fungus that causes a disease in wheat. Its scientific name is indeed Puccinia. So, this matching is correct.

Step 2: Examine Choice B

Yeast is a microorganism that is used in various food production like bread and fermentation of alcohol in beer. So, this matching is correct too.

Step 3: Examine Choice C

Chrysophytes are golden-brown algae or diatoms and they do contribute to the formation of diatomaceous earth. This matching is correct.

Step 4: Examine Choice D

Penicillium is a genus of fungus used in the production of the antibiotic penicillin, it doesn't cause Red tide. Red tide is caused by a bloom of dinoflagellates. So, this match is incorrect.

Key Concepts

Puccinia and Rust

Understanding the connection between Puccinia and rust is an essential part of grasping plant pathology in NEET Biology. Puccinia is a large genus of fungi, and species within this genus are well-known for causing rust diseases on various plants. Rusts are among the most destructive plant diseases, notably affecting cereal crops like wheat. The rust caused by Puccinia forms reddish or brownish masses of spores on the host plant, and these can severely damage crops. A known species, Puccinia graminis, is responsible for wheat rust, which has historically led to significant agricultural losses. By recognizing the host-pathogen relationship actions can be taken such as planting resistant varieties or using fungicides to manage the spread of rust.

Students studying NEET Biology should not only memorize the scientific names but also understand the life cycle and economic impact of these rusts on agriculture.

Yeast Fermentation

The applications of yeast in fermentation processes hold paramount importance in biotechnology, which is a key concept in NEET Biology. Saccharomyces cerevisiae, commonly known as baker's yeast, plays a crucial role in the production of bread and beer. Yeast uses the sugars in the dough or wort (the liquid extracted from mashing grains) to produce alcohol and carbon dioxide through fermentation. In bread making, it is the carbon dioxide that allows the dough to rise, creating the soft texture we enjoy.

Alternatively, in brewing beer, both the alcohol and the flavors produced by fermentation are essential. Understanding the biochemical pathways of fermentation, such as glycolysis and ethanol fermentation, can give students a deeper insight into bioenergetics and metabolic processes.

Chrysophytes

Delving deeper into the world of microscopic aquatic organisms, chrysophytes come into spotlight. They are predominantly found in freshwater and are part of the phytoplankton community. These golden-brown algae, which include diatoms and golden algae, are distinguished by their unique chloroplasts that contain chlorophylls a and c, and they give them their characteristic color. Chrysophytes contribute significantly to aquatic ecosystems and the global carbon cycle. They form diatomaceous earth when their silica cell walls accumulate over time, which has various industrial uses such as filters and abrasives.

NEET Biology students should pay attention to their ecological roles and how their silica frustules—the unique glass-like cell walls of diatoms—are preserved in the geological record, providing valuable information about past environmental conditions.

Penicillium Antibiotic

On the topic of medical breakthroughs, the genus Penicillium stands out significantly in the NEET Biology curriculum. Penicillium is a group of molds from which penicillin, the first antibiotic, was discovered by Alexander Fleming in 1928. Penicillin antibiotics have been widely used to treat bacterial infections by inhibiting the synthesis of peptidoglycan, an integral component of bacterial cell walls, leading to cell lysis and death. This discovery marked the beginning of the antibiotic era and has saved countless lives since.

Students should understand the mode of action of penicillin, the difference between bactericidal and bacteriostatic agents, and the impact of antibiotics on public health. Moreover, the concept of antibiotic resistance, which poses a significant challenge in contemporary medicine, can also be linked to this subject, making it a highly relevant study topic.