MCQ
The pyramid which cannot be inverted in a stable ecosystem is that of:
- ABiomass.
- BNumber.
- CEnergy.
- DAll of these.
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$(I)$ Nucleus of the functional megaspore divides meiotically to form two nuclei.
$(II)$ After $8$ nucleate stage, cell walls are laid down leading to organization of typical female gametophyte
$(III)$ The egg apparatus, consists of two synergids and one egg cell.
$(IV)$ Three cells are at the chalaza end are called antipodal cells.