Prepare for NEET Biology Plant Kingdom with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert solutions to understand plant diversity and groups.
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
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
Explain the role of the annulus in fern sporangia, contrasting its function with the role of elaters in liverworts.
Both annulus and elaters aid in nutrient absorption.
The annulus protects the developing spores, while elaters facilitate fertilization.
The annulus aids in spore dispersal in ferns by a spring-like mechanism, while elaters in liverworts are hygroscopic and facilitate spore dispersal by changing shape with humidity.
Both annulus and elaters are involved in anchoring the plant to the substrate.
Which of the following statements regarding the life cycle of Selaginella is INCORRECT?
The megaspores and microspores germinate to give rise to female and male gametophytes, respectively.
The development of the zygote into the embryo takes place within the female gametophyte, which is independent of the sporophyte.
The sporophyte is the dominant phase in the life cycle.
Selaginella exhibits heterospory.
Fucoxanthin, a prominent pigment in Phaeophyceae, masks other pigments. Under which light conditions would chlorophyll a's fluorescence be MOST readily observable in these algae?
Blue light
Red light
Green light
Yellow light
