All Free Biology MCQs with Answers

1771. _____________ supported theory of special creation?

• A. Linnaeus
• B. Aristotle
• C. Mendel
• D. Lamarck

Explanation: Linnaeus supported the idea of special creation and believed species were fixed, although his classification system later became useful to evolutionary biology. Students may choose Lamarck because he proposed an early theory of evolution, but Lamarck rejected the idea that species were permanently fixed by special creation.

1772. In Hardy-Weinberg formula P2 represents frequency of_____________?

• A. Recessive allele
• B. Dominant allele
• C. Homozygous dominant individual
• D. Homozygous recessive individual

Explanation: In the Hardy-Weinberg expression p2 + 2pq + q2 = 1, p is the frequency of the dominant allele, so p2 represents individuals carrying two dominant alleles, or homozygous dominant individuals. Students may choose the dominant allele itself because p denotes its frequency, but p2 denotes the genotype frequency produced by two dominant alleles.

1773. Amphibians are considered to be evolved from___________?

• A. Newts
• B. Varanope
• C. Dipnoi
• D. Hagfishes

Explanation: Traditional textbook accounts identify Dipnoi, or lungfishes, as close relatives of the lobe-finned vertebrates from which amphibians evolved. Newts are amphibians themselves, while hagfishes are jawless fishes, so a student may choose a by confusing an amphibian example with an ancestral group.

1774. Which of the following is the correct sequence in the biological method?

• A. Observation?hypothesis?law?theory
• B. Observation?hypothesis?deduction?testing of deduction
• C. Hypothesis?observation?deduction?testing of deduction
• D. law?theory?deduction?observation

Explanation: The biological method normally proceeds from observation to a tentative hypothesis, then to deductions or predictions that are tested experimentally. A law or theory is not automatically the next step after every observation, so a is the likely error caused by memorising a simplified hierarchy instead of the testing sequence.

1775. Unbroken series of organisms arranged from ancestor to descendant sequence is____________?

• A. Biodiversity
• B. Phyletic lineage
• C. Connecting link
• D. Evolutionary line

Explanation: A phyletic lineage is an uninterrupted sequence of organisms showing descent from an ancestor through successive descendants. A connecting link is only an organism showing features of two groups, not the complete ancestor-to-descendant series, so it is the likely distractor.

1776. A-biogenesis means that_____________?

• A. Living things originated from bacteria
• B. Mycobionts
• C. Non-living things
• D. None of these

Explanation: Abiogenesis is the proposed origin of living organisms from non-living chemical matter, particularly in the early history of Earth. Students may choose “none” because option c is incomplete grammatically, but “non-living things” is clearly intended to mean origin from non-living matter.

1777. _____________ is a scientific word for human beings?

• A. Animals
• B. Homo sepions
• C. Omnivore
• D. Consumer

Explanation: The scientific name of humans is Homo sapiens, with Homo as the genus and sapiens as the species name. Students may choose animals because humans belong to the animal kingdom, but that is a broad classification rather than the binomial scientific name.

1778. Animals that eat plants are called___________________?

• A. Herbivores
• B. Consumer
• C. Carnivores
• D. Omnivores

Explanation: Herbivores are animals adapted to feed mainly on plants, such as grasses, leaves or fruits. Students may choose consumer because herbivores are consumers in a food chain, but consumer also includes carnivores and omnivores and is therefore less specific.

1779. The study of nature is called__________?

• A. Science
• B. Atom
• C. Molecule
• D. Element

Explanation: Science is the systematic study of the natural world through observation, testing and evidence, so it includes the study of nature. Students may choose molecule because molecules occur in nature, but a molecule is a unit of matter, not a field of study.

1780. Which of the following is the basic unit of classification___________?

• A. Species
• B. Genus
• C. Family
• D. Order

Explanation: A species is the basic unit of biological classification and generally consists of organisms that can interbreed and produce fertile offspring. Genus, family, and order are progressively higher groups containing one or more lower taxonomic units. Students commonly choose genus because it is the first larger group above species, but it is not the basic unit.