Those elements whose absence prevent plants from completing its life cycle are called___________
A.
Micro element
B.
Macro element
C.
Nonessential elements
D.
Essential elements
Answer: Option D
Explanation:
In order to grow and complete their life cycle plants need certain essential nutrients. The presence of these nutrients in the form of inorganic elements is called essential elements.
Who proposed the idea of essential mineral nutrients of the plant?
A.
Leonhart Fuchs
B.
Aristotle
C.
Arnon and Stout
D.
Carl Linnaeus
Answer: Option C
Explanation:
Arnan and Stout in 1939 first proposed the idea of essential mineral nutrients for the plants. There are about 17 elements which are considered as the most essential for angiospermic plants.
Nitrogen is a mineral element as it is acquired by the plants in the form of inorganic ions from the soil while carbon, hydrogen, and oxygen are non-mineral elements.