Question 2
Which of these is not essential for seed germination?
The right answer is the one marked above.
Light. The four essential factors are the viability of the seed, air (oxygen), water and temperature — light is not among them.
A germinating seed lives on a packed lunch rather than photosynthesising, which is exactly why seeds can germinate buried in soil. Light becomes necessary only once the first leaves are above ground and the food store has run out.