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
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 feature distinguishes the protonema of Funaria from that of a fern?
Filamentous nature
Green color
Presence of oblique septa
Production of buds
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 characteristic is NOT shared by both the protonema of a moss and the filamentous stage of some green algae?
Presence of rhizoids
Photosynthetic capability
Filamentous structure
Haploid nature
The suspensor in Selaginella plays a crucial role in:
Anchoring the gametophyte to the substrate
Protecting the developing sporophyte
Facilitating spore dispersal
Pushing the developing embryo into the nutritive tissue of the female gametophyte
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 feature distinguishes Gnetum from other gymnosperms and brings it closer to angiosperms?
Absence of archegonia
Presence of vessel elements in the xylem
Non-motile male gametes
Needle-like leaves
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.
