Multiple Choice
Which of the following characteristics of life is demonstrated when humans maintain a stable internal body temperature despite changes in the external environment?
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1. Introduction to Biology
Characteristics of Life
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Why is a protozoan considered animal-like?
A
Because it forms multicellular colonies
B
Because it is heterotrophic and lacks a cell wall
C
Because it performs photosynthesis like plants
D
Because it has chloroplasts and stores starch
Verified step by step guidance1
Understand the term 'protozoan': Protozoans are single-celled eukaryotic organisms that belong to the kingdom Protista. They are often compared to animals due to certain characteristics.
Clarify the term 'heterotrophic': Heterotrophic organisms obtain their food by consuming other organisms or organic matter, rather than producing their own food through photosynthesis.
Explain the absence of a cell wall: Unlike plants and fungi, protozoans lack a rigid cell wall, which is a characteristic feature of animal cells.
Compare protozoans to plants: Protozoans do not perform photosynthesis, lack chloroplasts, and do not store starch, which are typical features of plant-like organisms.
Conclude why protozoans are animal-like: Protozoans are considered animal-like because they are heterotrophic and lack a cell wall, which aligns them more closely with animals than plants or fungi.
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