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Question

Study the four statements (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.

A
A and B
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B
B and C
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C
C and D
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D
A and D
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Solution

The correct option is D A and D
A. Definition of biological species was given by Ernst Mayr. This is a correct statement.

The biological concept of species was given by Mayr. According to him, "species are groups of interbreeding natural populations that are reproductively isolated from other such groups."

B. Photoperiod does not affect reproduction in plants. This is an incorrect statement.

The length of the day or duration of light is called the light period or photoperiod. It does affect reproduction in both plants and animals.

C. Binomial nomenclature system was given by R. H. Whittaker. This is an incorrect statement.

Binomial nomenclature system was given by Linnaeus. The system of providing a name with two components (genus and specific epithet) is called binomial nomenclature.

D. In unicellular organisms, reproduction is synonymous with growth. This is a correct statement.

In unicellular organisms, reproduction and growth are mutually inclusive events.

Hence, statements A and D are correct.

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