Question

The classical experiments on growth were performed by

• A. Lamarck and Boysen Jensen
• B. Boysen Jensen and Darwin
• C. Darwin and Lamarck
• D. Lamarck and Darwin

Answer 1

Answer: (B)

Boysen Jensen and Darwin

Charles Darwin and Francis showed the presence of the phototropic stimulus at the tip of the plant and that the apical region communicates with the cell of elongation zone. The Danish plant physiologist Boysen-Jensen experimentally showed that the apex cells communicate with the the cell of elongation zone via chemical passing down from the tip of the coleoptile. Lamarck gave the theory of inheritance of acquired characters that explains evolution as the inheritance of acquired characters under influence of needs as posed as changing environmental conditions. Thus, the correct answer is option B.