Problem 58 - Objective Biology for NEET

Question

Select the correct statement from the following for kingdom fungi A. They are heterotrophic. B. They show less diversity in morphology and habitat. C. Yeast is an unicellular fungus. D. They prefer to grow in warm and humid places. (a) A and D only (b) \(\mathrm{C}\) and \(\mathrm{D}\) only (c) A, C and D only (d) A and B only

Step-by-Step Solution

Answer

None of the given options is correct. The correct answer should include statements A and C.

Step 1: Identify the Characteristics of Kingdom Fungi

Kingdom Fungi has specific characteristics. They are mainly heterotrophic, which means they don't produce their own food, instead, they absorb nutrients from their environment. Also, fungi can have vast diversity in both morphology and habitat - they can exist as yeast, molds, or mushrooms, and they can grow in different environmental conditions. Moreover, yeast is indeed an unicellular fungus. Lastly, Fungi can grow in various conditions but are often found in warm, dark locations with high humidity.

Step 2: Match The Options With The Characteristics

Now, let's match the statements with the known characteristics:A. They are heterotrophic - This is Correct.B. They show less diversity in morphology and habitat - This is Incorrect, as fungi can have vast diversity in both morphology and habitat. C. Yeast is an unicellular fungus - This is Correct.D. They prefer to grow in warm and humid places - This is partially correct but not fully accurate as fungi can grow in various conditions not just warm and humid places.

Step 3: Select the Choices That Contain The Correct Statements

Now, from the given multiple choices, we are looking for options that contain only correct statements:(a) A and D only - Incorrect. Statement 'D' isn't wholly accurate.(b) C and D only - Incorrect. Statement 'D' isn't wholly accurate.(c) A, C and D only - Incorrect. Statement 'D' isn't wholly accurate.(d) A and B only - Incorrect. Statement 'B' is wrong.

Key Concepts

Heterotrophic Organisms

Fungi are heterotrophic organisms, which sets them apart from plants that are typically autotrophic. Unlike plants that synthesize their own food through photosynthesis, fungi lack chlorophyll, the green pigment necessary for this process. Instead, fungi obtain nutrients by absorbing organic molecules from their surroundings. This absorption occurs through their extensive mycelium—a network of tiny filaments called hyphae that infiltrate the food source.

There are different ways fungi can be heterotrophic. Saprophytic fungi decompose dead organic matter, playing a critical role in nutrient cycling in ecosystems. Parasitic fungi feed on living organisms and may cause diseases, while mutualistic fungi form symbiotic relationships where both organisms benefit. An example of such mutualism is the mycorrhizal association, where fungi exchange nutrients with the roots of plants.

Fungal Diversity

Despite what many think, the kingdom Fungi showcases an impressive variety in both form and function, showcasing fungal diversity. This diversity is evident in their morphology, with shapes ranging from the single-celled brewer's yeast to the complex multicellular morel mushrooms.

Fungi can also differentiate in their reproduction strategies; some reproduce sexually, while others do so asexually. In sexual reproduction, fungi can engage in fusion of different mating types, while asexual reproduction can involve spore formation. Moreover, fungi are classified into various groups such as Ascomycota, Basidiomycota, Zygomycota, and Chytridiomycota, based on their reproductive structures and other genetic and molecular characteristics.

Unicellular Fungus

When discussing unicellular fungi, the most common example is yeast. Yeast, such as Saccharomyces cerevisiae, which is widely used in baking and brewing, is a single-celled organism that belongs to the fungal kingdom. It reproduces rapidly through a process called budding, where a new cell grows directly from the body of the parent.

However, yeast's simplicity is deceiving because it performs many of the complex biochemical pathways found in multicellular organisms. Its unicellular nature makes it an excellent model organism for biological studies, including genetics and cell biology. This simplicity also allows it to adapt quickly to various environments, contributing to its widespread use in various industries.

Fungi Habitat

Fungi can be found in a wide range of habitats, contributing to their ecological diversity. While it's true that many fungi flourish in warm and humid environments, this is not an exclusive preference. Fungi are incredibly adaptable and can colonize different substrates, from soil, to wood, to animal flesh.

Some fungi are extremophiles, thriving in environments with extreme conditions such as high acidity, salinity, or temperatures. It is their ability to occupy various niches that allows fungi to play significant roles in environmental processes such as decomposition and nutrient cycling. Their adaptability coupled with their mode of nutrient absorption and a lack of reliance on sunlight allows them to thrive in dark environments, such as soil or beneath the forest canopy.