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.
In pteridophytes, the antherozoids are characterized by:
Biflagellate and straight
Multiflagellate and spirally coiled
Aflagellate and amoeboid
Uniflagellate and comma-shaped
Which feature distinguishes the prothallus of Psilotum from that of most other pteridophytes?
Photosynthetic and above ground
Subterranean and saprophytic nature
Presence of distinct antheridia and archegonia on the same prothallus
Heart-shaped and free-living
The 'ligulate leaves' found in some pteridophytes are primarily associated with which genus?
Dryopteris
Selaginella
Psilotum
Equisetum
In which pteridophyte does the stem have a distinct 'siphonostele' with a central pith surrounded by vascular tissue?
Psilotum
Selaginella
Equisetum
Lycopodium
Which of the following statements regarding the development of the male gametophyte in Pinus is INCORRECT?
Microspore is the first cell of the male gametophyte.
The prothallial cell eventually degenerates.
The generative cell directly develops into the sterile cell and two male gametes.
A tube cell and a generative cell are formed after the first mitotic division of the microspore.
In gymnosperms, the ovule is considered naked because:
It lacks an integument.
It is not enclosed within an ovary.
It is exposed before fertilization.
It lacks a megasporangium.
Which feature distinguishes Gnetum from other gymnosperms and aligns it more closely with angiosperms?
Absence of archegonia
Presence of vessels in the xylem
Naked ovules
Wind pollination
The 'polyembryony' observed in some gymnosperms like Pinus refers to:
The development of multiple seeds within a single cone.
The development of multiple embryos within a single ovule.
The fusion of multiple male gametes with a single egg cell.
The development of multiple archegonia within a single ovule.
Which of the following gymnosperms does NOT possess motile sperm?
Cycas
Ginkgo
Pinus
Gnetum
In gymnosperms, the megaspore mother cell undergoes:
Mitosis to form two megaspores, both of which are functional.
Meiosis to form four megaspores, all of which are functional.
Meiosis to form four megaspores, of which one is functional.
Mitosis to form four megaspores, of which three are functional.
