All Free Biology MCQs with Answers

• A. Leguminosae
• B. Soldnacoae
• C. Brassicaceae
• D. Graminea

Explanation: Bauhinia variegata is a species of flowering plant in the legume family, Fabaceae.

• A. Poaceae
• B. Fabaceae
• C. Brassicaceae

Explanation: Raphanus sativus, commonly known as radish, belongs to the family Brassicaceae (also known as Cruciferae).

• A. Gram
• B. Tomato
• C. Potato
• D. Red pepper

Explanation: The correct answer is Tomato. Lycopersicum esculentum is the scientific name for the tomato plant, which is part of the nightshade family…

• A. AMP
• B. ATP
• C. ADP
• D. FAD

Explanation: A nucleotide is an organic molecule that is composed of a nitrogenous base, a five-carbon sugar, and a phosphate group.

• A. Trivirates
• B. Triumvirates
• C. Trisvirates
• D. All of the above

Explanation: The correct answer is 'Triumvirates.' This term is used to describe a powerful group of three, which in this context applies to the three…

• A. Decarboxylation
• B. Hydration
• C. Dehydration
• D. Hydrolysis

Explanation: Condensation reactions involve the combination of two molecules to form a new molecule, often with the loss of a small molecule like water…

• A. Introduction of heterospory
• B. Rentantion of the megaspore within megasporangium
• C. Fertilization of the egg prior to discharge.
• D. All of the above

Explanation: All of the options given in the question are correct as there are various steps involved in the evolution of seed habit which are as…

• A. Appendix
• B. Leg muscles
• C. Coccyx
• D. Nictitating membrane

Explanation: Vestigial organs are rudimentary anatomical structures that are retained in a species despite having lost their primary ancestral…

• A. Homologous
• B. Analogous
• C. Acquired
• D. Vestigial

Explanation: These are the organs that have similar anatomical structures but perform different functions.

• A. Equus
• B. Eohippus
• C. Mesohippus
• D. Merychippus

Explanation: The modern horse is called Equus caballus.

• A. Digestion
• B. Excretion
• C. Immunity
• D. Movement

Explanation: The appendix has been found to play a role in mammalian mucosal immune function.

• A. Gene pool
• B. Genetic drift
• C. Gene mutation
• D. Gene flow

Explanation: Genetic drift is a mechanism of evolution, it refers to random fluctuations in the frequencies of alleles from generation to generation…

• A. Radiation
• B. Adaptation
• C. Vestigial organ
• D. Speciapion

Explanation: Inheritance characteristics refer to traits that are passed from parent to offspring during reproduction.

• A. fishes tail fin
• B. dog's front legs
• C. mosquitoes wings
• D. alligator's claws

Explanation: Homologous Organs: These organs have similar anatomical structures but perform different functions.

• A. Hutton and Lyell
• B. Lamarck
• C. Georges Cuvier
• D. Darwin

Explanation: James Hutton along with Charles Lyell developed the concept of uniformitarianism.

• A. Seal's flipper
• B. Octopus tentacle
• C. Bird's wing
• D. Both Seal's flipper and Bird's wing

Explanation: Anatomically, the human arm, the flippers of seals, and the wings of the birds are the forelimbs containing similar bones.

• A. George Cuvier
• B. James Hustion
• C. Louis Agassiz
• D. Alfred Russel Wallace

Explanation: Louis Agassiz was known for opposing Darwin's theory of evolution and believed that new species were created through divine intervention…

• A. Generation time
• B. Geological age
• C. Ecological time
• D. Physiological age

Explanation: The geological time scale relates stratigraphy rock layers) to periods.

• A. Jurassic
• B. Mesozoic
• C. Metazoic
• D. Both (a) & (b)

Explanation: The correct answer is "Both (a) & (b)". Reptiles flourished during the Mesozoic era, known as the "Age of Reptiles", which includes the…

• A. Dev Vaties
• B. Van Haeckel
• C. Lamarck
• D. Oparin

Explanation: "Ontogeny recapitulates phylogeny" is a phrase associated with the field of evolutionary biology.