MCQ
Industrial melanism is an example of:
- ADrug resistance.
- BDarkening of skin due to smoke from industries.
- ✓Protective resemblance with the surroundings.
- DDefensive adaptation of skin against ultraviolet radiations.
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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.