MCQ
A Drusa type of embryo sac is
  • A
    $16$ celled and $16$ nucleate
  • B
    $15$ celled and $15$ nucleate
  • $15$ celled and $16$ nucleate
  • D
    $14$ celled and $15$ nucleate

Answer

Correct option: C.
$15$ celled and $16$ nucleate
c
It’s obvious.

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(A) Gemmae are green, multicellular, asexual buds, which develop in small receptacles called gemma cups located on the thalli in mosses.
(B) In thallophytes; sporophyte is differentiated into a foot, seta and capsule.
(C) The predominant stage of the life cycle of a liverworts is the gametophyte which consists of two stages.
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(H) In bryophytes the dominant phase in the life cycle is the gametophytic plant body.
(I) The sporophytes bear sporangia that are subtended by leaf-like appendages in pteridophytes called sporophylls.
(J) In pteridophytes, multicellular, free living. mostly photosynthetic thalloid gametophytes is called prothallus.
(K) Zygote produces a multicellular well- differentiated sporophyte which is the dominant phase of the Algaes.
(L) The development of the zygotes into young embryos take place within the female gametophytes. This event is a precursor to the seed habit considered an important step in evolution.
(M) The pteridophytes are classified into four classes: Bryopsida: lycopsida; sphenopsida and Pteropsida.
(N) The gymnosperms are plants in which the ovules are not enclosed by any ovary wall and remain exposed both before and after fertilization.
(0) One of the Angiosperm, sequoia is one of the tallest tree species.
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