Study the four statement (A-D) given below and select the two correct ones out of them :
(A) Definition of biological species was given by Ernst Mayr.
(B) Photoperiod does not affect reproduction in plants.
(C) Binomial nomenclature system was given by R.H. Whittaker.
(D) In unicellular organisms, reproduction is synonymous with growth.
The two correct statements are
- B and C
- C and D
- A and D
- A and B
The Correct Option is C
Solution and Explanation
Answer: Option 3 - A and D
Explanation:
Let's break down the statements:
(A) Definition of biological species was given by Ernst Mayr:
Correct. Ernst Mayr proposed the biological species concept, which defines species as groups of interbreeding natural populations that are reproductively isolated from other such groups.
(B) Photoperiod does not affect reproduction in plants:
Incorrect. Photoperiod is a critical environmental factor that affects the reproductive behavior of many plants. Plants are classified based on their response to the length of day and night, such as long-day plants (LDP), short-day plants (SDP), and day-neutral plants. Photoperiod has a significant role in the timing of flowering and reproduction.
(C) Binomial nomenclature system was given by R.H. Whittaker:
Incorrect. Binomial nomenclature, the system of giving species a two-part Latin name (genus and species), was established by Carl Linnaeus. R.H. Whittaker contributed to the five-kingdom classification system, not binomial nomenclature.
(D) In unicellular organisms, reproduction is synonymous with growth:
Correct. In unicellular organisms, such as bacteria, reproduction (by binary fission) is often considered synonymous with growth, as the organism divides and multiplies into two identical cells, resulting in an increase in population size.
Conclusion:
The two correct statements are (A) and (D), which makes Option 3 the correct answer.
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Concepts Used:
The Living World
- The living world includes a vast variety of living organisms like plants, animals, and even microorganisms that exist on the earth.
- These organisms also differ in size, color, habitat, physiology, and morphology.
- Biologists have developed certain rules and principles supplementary which are helpful in the identification, nomenclature, and classification of organisms.
- Such rules and principles lie in Taxonomy.
- The taxonomic studies are very helpful and useful in specific fields like forestry, industry, agriculture, and for knowing our bio-resources.
- All discovered living organisms are being named so that they are known by the same name throughout the world.
- Each biological name is a collection of a generic name indicating the genus of an organism and a specific name that indicates the species.