Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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- A. Rhizoids, which help to anchor the plant
- B. Stomata and chloroplasts in the epidermis
- C. Horn-like projections out of the gametophyte
- D. Mature sporangium that splits open at the ends
Explanation: The correct answer is Option B: stomata and chloroplasts in the epidermis.These features are essential for the sporophyte's adaptation to…
Correct answer: Stomata and chloroplasts in the epidermis- A. Antipodal cells, polar nuclei, sperm cell and tube cells
- B. Synergids, egg cell, polar nuclei and antipodal cells
- C. Synergids, egg cell and generative cells
- D. Tube cells and sperm cell
Explanation: In flowering plants, the embryo sac is the female gametophyte that contains seven cells: two synergids, one egg cell, two polar nuclei…
Correct answer: Synergids, egg cell, polar nuclei and antipodal cells- A. Diatoms
- B. Green algae
- C. Brown algae
- D. Dinoflagellates
Explanation: Seaweeds is the common name for large, multicellular marine algae, most commonly referring to brown algae, which includes kelp and other…
Correct answer: Brown algae- A. Haploid spores
- B. Dominant sporophyte
- C. Independent gametophyte
- D. Antheridium and Archegonium
Explanation: The correct answer is the presence of a dominant sporophyte.In tracheophytes, the sporophyte is the prominent and visible phase of the…
Correct answer: Dominant sporophyte- A. Pollen tube will disappear
- B. Antipodal cells will double in number
- C. Polar nuclei will form triploid endosperm
- D. Egg cell will fuse with a synergid to form diploid zygote
Explanation: In angiosperms, double fertilization involves two key events: one sperm cell fuses with the egg cell to form a diploid zygote, and another…
Correct answer: Polar nuclei will form triploid endosperm- A. Polyandrous
- B. Polypetalous
- C. Polysepalous
- D. Polyphyllous
Explanation: The correct answer is polyphyllous.This term is used to describe flowers with multiple free perianth leaves.
Correct answer: Polyphyllous- A. Haploid spores
- B. Dominant sporophyte
- C. Independent gametophyte
- D. Antheridium and Archegonium
Explanation: The correct answer is the presence of a dominant sporophyte.In tracheophytes, the sporophyte is the prominent and visible phase of the…
Correct answer: Dominant sporophyte- A. Fragmentation of thalli and gemmae cups
- B. Fragmentation of thalli and oospores
- C. Gemmae cups and zoospores
- D. Oospores and zoospores
Explanation: The correct answer is fragmentation of thalli and gemmae cups. Liverworts can reproduce asexually by breaking off parts of their thalli…
Correct answer: Fragmentation of thalli and gemmae cups- A. A short stem bearing side branches
- B. Small projecting extensions of stem tissue
- C. Side branches dividing in the same spatial plane
- D. Infilling of simple tissues between lateral branches
Explanation: Microphylls in club mosses (lycopsida) evolved from the infilling of simple tissues between lateral branches.
Correct answer: Infilling of simple tissues between lateral branches2030. In the given diagram:
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option C shows gametophyte with embedded antheridia and archegonia.So C is the correct option.
Correct answer: Option C- A. Increases the chances of mutation
- B. Facilitates adaptation to environment
- C. Provides variability in the population
- D. Produces identical offspring in short time
Explanation: The correct answer is Option B: facilitates adaptation to environment. Reproduction through cuttings produces offspring that are…
Correct answer: Facilitates adaptation to environment- A. Pollen tube
- B. Two male gametes
- C. Endosperm nucleus
- D. Multi-nucleated female gametophyte
Explanation: The correct answer is Option B: two male gametes.In gymnosperms, unlike angiosperms, there is no double fertilization event that results…
Correct answer: Two male gametes- A. Synergids
- B. Archegonia
- C. Polar nuclei
- D. Antipodal cells
Explanation: Female gametophyte of gymnosperms typically contains archegonia, which are flask-shaped structures containing the egg cell.
Correct answer: Archegonia- A. Steam
- B. Dry heat
- C. Filtration
- D. Radiation
Explanation: Dry heat helps kill the organisms using the destructive oxidation method.
Correct answer: Dry heat- A. Peptidoglycans
- B. Flagellin
- C. Bacteriorhodopsin
- D. Chitin
- E. Phycobilins
Explanation: Chitin is a polysaccharide found in the exoskeleton of arthropods and in the cell walls of fungi.
Correct answer: Chitin- A. Mycoplasma
- B. Gram positive bacteria
- C. Gram negative bacteria
- D. Archaeo bacteria
Explanation: Mycoplasma is indeed a bacterium that is known for lacking a cell wall.
Correct answer: Mycoplasma- A. Crystal violet
- B. Gram's iodine
- C. Feulgen stain
- D. Safranin
Explanation: Option D is correct as gram-negative bacteria are not easily stained by primary dye (crystal violet) so a secondary dye (safranin or…
Correct answer: Safranin- A. Methanogens
- B. Cyanobacteria
- C. Euglena
- D. Spirogyra
Explanation: There is suggestive evidence that photosynthetic organisms were present approximately 3.2 to 3.5 billion years ago, in the form of…
Correct answer: Cyanobacteria2039. Bacterial pilli help in:
- A. Locomotion
- B. Conjugation
- C. Phagocytosis
- D. Pinocytosis
- E. Exocytosis
Explanation: Conjugative pili allow for the transfer of DNA between bacteria, in the process of bacterial conjugation.
Correct answer: Conjugation- A. Mesosome
- B. Golgi bodies
- C. Mitochondria
- D. Chloroplast
Explanation: Bacteria are prokaryotes. They are made up of single cells. They do not have well-defined nuclei, instead, they possess nucleoids as…
Correct answer: Mesosome