Answer: The two Darwins.
- A Gregor Mendel
- B Robert Hooke
- C The two Darwins
- D Melvin Calvin
Correct answer: C. The two Darwins
Explanation: Charles Darwin and his son Francis showed that grass coleoptiles bend towards light because the tip senses it - the first clue to auxin.
Geometric growth (where both daughter cells keep dividing) produces this classic S-shaped curve: a slow lag phase, a rapid exponential phase, and a levelling-off stationary phase as nutrients or space become limiting - the same fundamental pattern seen in population growth.
Concept context
Phases of plant growth, the five classical plant hormones plus newer ones, photoperiodism, vernalization, and seed dormancy.