Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Which specific characteristic of Chlamydomonas distinguishes its flagellar structure from other Chlorophyceae members?
Presence of flagellar hairs or mastigonemes
Absence of a basal body
9+0 microtubule arrangement in the axoneme
Flagella covered by a sheath of scales
The haptomonada, Pavlova, exhibits a unique flagellar arrangement. How does this differ fundamentally from the typical Chlamydomonas flagellar apparatus?
One flagellum is typically shorter and smooth, lacking hairs
Both flagella are of equal length and covered in hairs
Three flagella emerge from a basal body
Flagella are absent in Pavlova
In the life cycle of Polysiphonia, a complex Rhodophycean alga, what unique characteristic distinguishes it from most other algal groups?
Presence of a dominant sporophyte generation
Lack of motile gametes
Three multicellular phases: carposporophyte, tetrasporophyte, and gametophyte
Production of non-motile spores
A unique characteristic observed in some angiosperm families like Asteraceae and Poaceae is the presence of a specialized inflorescence where the individual flowers are highly reduced and closely packed together, mimicking a single flower. This specialized inflorescence is known as:
Cyathium
Hypanthodium
Pseudanthium
Verticillaster
Which of the following combinations of floral characteristics is MOST likely to be associated with wind pollination?
Large, showy flowers; abundant nectar; small amounts of pollen; sticky stigma
Small, inconspicuous flowers; no nectar; large amounts of pollen; feathery stigma
Brightly colored flowers; strong fragrance; moderate amounts of pollen; tubular stigma
Large, bell-shaped flowers; copious nectar; few pollen grains; exposed stigma
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.
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
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.
The sporophyte of a certain bryophyte is completely dependent on the gametophyte. Microscopic examination of its cells reveals the presence of prominent plasmodesmata. Which of the following is LEAST likely to be true about this bryophyte?
It belongs to the class Anthocerotopsida.
Its sporophyte lacks stomata.
It is homosporous.
It reproduces asexually through fragmentation of the gametophyte.
Which of these characteristics is NOT associated with the evolution of heterospory in pteridophytes?
Reduction in the number of megaspores
Increased protection of the female gametophyte
Development of endosporic gametophytes
Increased dependence on water for fertilization
