All Free Biology MCQs with Answers

2201. The word which E-Chatton suggested for bacteria and blue green algae was_____________?

• A. Autotrophs
• B. Heterotrophs
• C. Pro-cariotique
• D. Eu-cariotique

Explanation: E. Chatton used the term prokaryotic, written in the source as 'pro-cariotique', for bacteria and blue-green algae because their cells lack a true nucleus enclosed by a nuclear membrane. 'Eucaryotic' refers to cells with a true nucleus, so it describes the opposite cellular organisation. Students may select d if they remember only that both terms describe cell types.

2202. Solanum tuberosum is a scientific name of___________?

• A. Onion
• B. Amaltas
• C. Potato
• D. Tomato

Explanation: In binomial nomenclature, Solanum is the genus and tuberosum is the species name of the potato, Solanum tuberosum. Tomato is Solanum lycopersicum, while onion is Allium cepa. Students may choose tomato because both potato and tomato belong to the genus Solanum.

2203. Which of the following category is most general with its members lest resembling with each other than the other categries_____________?

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

Explanation: Taxonomic groups become more general in the order species, genus, family, order, class, phylum and kingdom. Members of an order therefore share fewer characteristics and resemble one another less closely than members of the smaller categories listed. Students may choose family because it sounds broad, but order is broader than family.

2204. Allium cepa is the scientific name of______________?

• A. Onion
• B. Amaltas
• C. Potato
• D. Tomato

Explanation: Allium cepa is the binomial scientific name of the onion. The genus Allium includes onions and related plants, whereas potato is Solanum tuberosum. Students may choose potato because both names are familiar examples of scientific names for common crops.

2205. Which of the Euglenas (a Protoctista) character resembles that of animals______________?

• A. They can move
• B. They lack cell wall
• C. They do not have chlorophyll
• D. Both a and b

Explanation: Euglena resembles animals because it can move using a flagellum and lacks a cellulose cell wall, having a flexible pellicle instead. Both statements a and b describe animal-like features, so d is the combined answer. Students may choose a alone if they overlook that animal cells also lack cell walls.

2206. Organisms of which of the following kingdom have absorptive mode of nutrition______________?

• A. Prokaryotae
• B. Protoctista
• C. Animalia
• D. Fungi

Explanation: Fungi use absorptive nutrition: they secrete digestive enzymes onto their food and absorb the soluble products through their hyphae. Animals ingest food before digesting it internally, so they do not have the characteristic absorptive mode of fungi. Students may choose Animalia because animals absorb digested nutrients, confusing absorption with the whole nutritional method.

2207. Five kingdom classification was proposed by_____________?

• A. Carlous Linnaeus
• B. E-Chatton
• C. Robert Whittaker
• D. Lynn Margulis and Karlene Schwartz

Explanation: Robert Whittaker proposed the five-kingdom classification in 1969, separating organisms according to cell type, body organisation and mode of nutrition. Linnaeus developed an earlier hierarchical system, while Chatton introduced the prokaryote-eukaryote distinction. Students may choose Margulis and Schwartz because they later modified and developed kingdom classifications, but they did not originate Whittaker's five-kingdom system.

2208. Mycoplasmas have been included in bacteria because:

• A. Do not have a cell wall
• B. Are heterotrophic
• C. Lack membrane bounded organelles
• D. Reproduce by binary fission

Explanation: Mycoplasmas are bacteria because they are prokaryotic cells and lack membrane-bound organelles such as a nucleus and mitochondria. Students may choose “do not have a cell wall,” but that is a special feature of Mycoplasma and does not define bacteria, since most bacteria do have cell walls.

2209. The one which is present in all living things is ___________?

• A. Cell nucleus
• B. DNA or RNA
• C. Cell membrane
• D. Vacuole

Explanation: All cellular organisms possess genetic material, either DNA or, in some biological systems, RNA, which stores or transmits hereditary information. The likely alternative is cell nucleus, but prokaryotes lack a membrane-bound nucleus and mature red blood cells also lack one.

2210. Strengthening material of prokaryotic cell wall is__________?

• A. Cellulose
• B. Chitin
• C. Inorganic salts silica waxes and ligin
• D. Peptidoglycan or Murein.

Explanation: Most bacterial cell walls are strengthened by peptidoglycan, also called murein, a mesh of sugars and peptide cross-links. Cellulose is characteristic of plant cell walls, chitin occurs in fungi and arthropods, and silica or waxes occur in some specialised coverings. Students may choose cellulose because it is associated with cell walls, but bacterial walls use peptidoglycan.