Amoeba and Yeast reproduce asexually by fission and budding
respectively, because they are:
a. Microscopic organisms
b. Heterotrophic organisms
c. Unicellular organisms
d. Uninucleate organisms.
NCERT Class XII
Biology - Main Course Book
Chapter 1. Reproduction
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Microscopic organisms mean that a microscope is required to see them, due to their tiny size.
Heterotrophic refers to the method in which they obtain their nutrition. This means they cannot synthesize their own food but consume other organisms for nutrition.
Unicellular refers to the number of cells which make up the organism, and is often a clue to their reproduction, as most unicellular organisms reproduce asexually.
Uninucelate refers to the number of nuclei contained with the organisms.
Thus the correct answer is c) Unicellular organisms
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