Answer: An undifferentiated mass of cells growing on culture medium.
- A A specialized root tissue that absorbs water and minerals
- B A virus-free shoot tip excised from the apical meristem
- C A mature seed embryo isolated for embryo rescue
- D An undifferentiated mass of cells growing on culture medium
Correct answer: D. An undifferentiated mass of cells growing on culture medium
Explanation: Callus is an undifferentiated, amorphous mass of cells that proliferates on a suitable culture medium from an explant.
Different fish species occupy different feeding depths in the same pond without competing for food: Catla feeds near the surface, Rohu in the middle zone, and Mrigal or common carp at the bottom - letting a single pond support far more total fish than one species alone.
Concept context
Learn about animal husbandry, plant breeding, tissue culture, biofortification, and single cell protein.
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