GROWTH DEVELOPMENT CHILD
GROWTH AND DEVELOPMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increasing the number of its cells
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increasing the size of its cell
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changing shape
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shrinking
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Detailed explanation-1: -Unicellular organisms (like bacteria, yeast and archaea) typically grow using a method called binary fission. Here each single cell (mother cell) expands, replicates its genetic material, and divides into two cells (daughter cells). In this way, each time a new generation is produced the population doubles (Fig. 1A).
Detailed explanation-2: -Unlike multicellular organisms, unicellular organisms do not grow in size or volume. Growth in unicellular organisms is marked by division which produces daughter cells. Thus, asexual reproduction by amitosis shows growth in these organisms.
Detailed explanation-3: -This is called a compensatory reaction and may occur either by some increase in cell size (hypertrophy), by an increase in the rate of cell division (hyperplasia), or both.
Detailed explanation-4: -Unicellular organisms grow by cell division.
Detailed explanation-5: -The largest a multicellular organism can grow is 5cm. This is the case with the green algae Valonia ventricosa. This single-celled algae is able to grow big because it has multiple nuclei and chloroplasts that allow the large size to function.