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STD 12 - 1. sexual reproduction in flowering plants — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 1. sexual reproduction in flowering plants1 Mark
MCQ
Identify the labelling of given diagrams
  • A
    $A-MMC, B-Megaspore dyad, C-Nucellus, D-Nucleus$
  • B
    $A- Nucellus, B- Megaspore dyad, C- Nucellus, D-MMC$
  • ✓
    $A- Nucellus, B-MMC, C- Nucellus, D- Megaspore dyad$
  • D
    $A-MMC, B- Nucellus, C- Megaspore dyad, D- Nucleus$
✓

Answer

Correct option: C.
$A- Nucellus, B-MMC, C- Nucellus, D- Megaspore dyad$
c
$A-Nucellus, B-MMC, C-Nucellus, D-Megaspore diad $Development of Female Gametophyte $1$. Megaspore mother cell undergoes the reductional/meiotic division that give rise to four megaspores $2$. Three of them die (in majority of plants) only one remains viable. This method of embryo sac formation is called monosporic development $3$. The nucleus of the functional megaspore divides mitotically to form two nuclei, which move to the opposite poles forming two nucleate embryo sac $4$. Two more sequential mitotic nuclear divisions results in the formation of four nucleate and later $8$ nucleate stages of embryo sac After the $8$ nucleate stage cell walls are laid down leading to the organization of typical female gametophyte

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