At least 6 good hours..
Any plant that you are growing will require water if there has not been enough rain. You would cultivate marijuana (strictly for medical purposes) in the same way that you would cultivate corn.
This does not demonstrate that the plants require sunlight because a control in which plants received sunlight was not used, there is no basis for comparison to arrive at the conclusion that plants need sunlight to grow.
A plants architecture determines the response to sunlight, but all plants require light to survive. Phototropism is the name assigned to the movement the makes to maximize its sun source.
Yes, plants require sunlight to produce food through photosynthesis.
there are many organisms that do not require sunlight to live but then there are some that need hosts
Viruses do not require sunlight for their survival. But certain photosynthetic bacteria such as Cyanobacteria require sunlight to perform photosynthesis.
Some that live in the bottom of the ocean, where no sunlight can reach it.
yes
Plants
Indoor planting of seeds requires sterile growing medium. Grafting would require clean bandaging. Sunlight kills many germs.
Some that live in the bottom of the ocean, where no sunlight can reach it.
Sunlight is a biotic factor on which the plant relies.