Reproduction cannot be an all inclusive defining characteristic of living organisms.
Unicellular organisms like bacteria, unicellular algae and amoeba, reproduction is synonymous with growth.
Photoperiod affect reproduction only in plants.
Rhizopus, Ectocarpus and protonema of Sphagnum multiply by fragmentation.
Correct answer: (c)
Solution: → Photoperiod affect reproduction only in plant.
⇒Photoperiod affects reproduction in seasonal breeds, both plants and animals. Most seasonal events are triggered by a photoperiod of a certain length this specific photoperiod length is referred ta as the critical day length are the critical photoperiod.
The photoperiodic control of reproduction may be due to the hormone melatonin. This is produced by the pineal gland.