Question

Which species mates when daylight is increasing from 13 hours to 13 hours and 15 minutes?

a) No species
b) Species that prefer shorter days
c) Species that prefer longer days
d) All species

Answer 1

The species that mate when daylight is increasing from 13 hours to 13 hours and 15 minutes are the long-day plants.

Step-by-step explanation:

Short-day plants require night periods longer than some critical value to flower, while long-day plants need night lengths shorter than some critical value to flower.

The actual critical daylength can vary depending on the species. Given that the daylight is increasing from 13 hours to 13 hours and 15 minutes, it means that the night period is getting shorter.

Therefore, the species that mate when daylight is increasing from 13 hours to 13 hours and 15 minutes are the long-day plants.