Prepare for NEET Biology Biological Classification with MCQs & PYQs on NEET.GUIDE. Get free practice, previous year questions, and expert guidance to classify and identify organisms.
Which specific characteristic of fungal cell walls makes them resistant to degradation by common bacterial enzymes like lysozyme?
Presence of cellulose
Presence of chitin
Presence of peptidoglycan
Presence of lignin
Certain fungi exhibit a unique phenomenon called heterokaryosis. Which statement BEST describes its significance?
It represents a diploid stage in the fungal life cycle, crucial for sexual reproduction.
It results in the formation of dikaryotic hyphae, ensuring genetic uniformity within the mycelium.
It allows for the coexistence of genetically different nuclei within a single mycelium, potentially leading to novel genetic combinations.
It triggers the formation of resistant spores, aiding in survival under unfavorable conditions.
The symbiotic association between a fungus and the roots of a higher plant is known as mycorrhiza. Which of the following is NOT a benefit conferred by the fungus to the plant in this association?
Increased absorption of water and minerals
Protection against certain soil pathogens
Enhanced tolerance to drought and salinity
Nitrogen fixation from the atmosphere
Members of the fungal class Phycomycetes are unique among fungi in several ways. Which of the following features is NOT characteristic of Phycomycetes?
Presence of coenocytic hyphae
Production of zoospores with flagella
Formation of asci containing ascospores
A tendency to thrive in aquatic or moist environments
Consider the following statements about fungal nutrition:
I. All fungi are heterotrophic.
II. Some fungi are saprophytic, while others are parasitic.
III. Fungi can digest complex organic compounds like cellulose and lignin.
IV. Fungi exclusively absorb nutrients through phagocytosis.
Which of the above statements are CORRECT?
I and II only
II and III only
I, II, and III only
I, II, III, and IV
The fungal cell membrane contains ergosterol, a sterol unique to fungi. Many antifungal drugs target ergosterol. Why is this a viable strategy for antifungal therapy?
Ergosterol is essential for fungal cell wall synthesis, and its inhibition weakens the cell wall.
Targeting ergosterol disrupts fungal cell membrane integrity without significantly affecting human cells, which contain cholesterol.
Ergosterol is a key enzyme in fungal metabolic pathways, and its inhibition disrupts essential cellular processes.
Ergosterol is involved in fungal reproduction, and its inhibition prevents fungal growth and spread.
Which of the following characteristics is NOT common to all protists?
Eukaryotic cell structure
Presence of a nucleus
Membrane-bound organelles
Multicellularity
Diatoms are unique due to their cell walls being composed of:
Cellulose
Chitin
Silica
Peptidoglycan
Which protist group is responsible for red tides?
Euglenoids
Diatoms
Dinoflagellates
Slime molds
