Biology MCQs
Topic Notes: Biology
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
61
Which category of microorganism is responsible for the condition known as Athlete's Foot?
Answer:
Fungus
Athlete's Foot, medically known as tinea pedis, is a common fungal skin infection. The fungi responsible, typically dermatophytes, thrive in warm, moist environments such as locker rooms and showers. They infect the superficial layers of the skin, leading to symptoms like itching, burning, and cracking, particularly between the toes.
62
Which fungal genus is colloquially referred to as 'Green Mold'?
Answer:
Penicillium
Penicillium is widely recognized as 'green mold' due to the characteristic blue-green color of its conidiophores and spores. This genus is ubiquitous in the environment and is frequently observed growing on decaying organic matter, food products, and damp surfaces, making it a common household and industrial mold.
63
Which group of organisms utilizes chitin as the primary structural component of its cell walls?
Answer:
Fungi
Chitin is a complex polysaccharide consisting of N-acetylglucosamine units. It provides significant structural rigidity and protection. Fungi are distinct from plants, which utilize cellulose for cell wall structure, because fungal cell walls are characteristically composed of chitin, which is also found in the exoskeletons of arthropods.
64
Fungi are heterotrophic organisms whose cell walls are primarily composed of which substance?
Answer:
chitin
Fungi are eukaryotic, heterotrophic organisms that obtain nutrients through absorption. A defining characteristic of the fungal kingdom is the presence of a rigid cell wall made of chitin, a complex polysaccharide that provides structural support and protection to the fungal cells, distinguishing them from plant cells which use cellulose.
65
Which fungal phylum is recognized as the largest in terms of species diversity?
Answer:
Ascomycota
Ascomycota, commonly known as sac fungi, represents the largest phylum within the kingdom Fungi. It includes a vast array of organisms, ranging from single-celled yeasts to complex cup fungi and morels, characterized by the production of sexual spores within a microscopic sac-like structure known as an ascus.
66
What is the primary nutritional source for fungi?
Answer:
organic material
Fungi are heterotrophic organisms that obtain nutrients through absorption. They secrete extracellular enzymes to break down complex organic matter in their environment, which they then absorb. While they often decompose dead plants or animals, 'organic material' is the most comprehensive description of their nutritional source.