Questions
21
Which of the following class of enzyme does not need manganese for its efficient activity?
Answer: Decarboxylases
22
Deficiency of which mineral causes dark green coloration of the leaves?
Answer: Phosphorus
23
Which of the following element is needed by plants in a very small quantity?
Answer: Sodium
24
Name the mineral element which is required by a plant in a great amount?
Answer: Nitrogen
25
Name the technique which involves the growth of a plant by suspending their roots in the air?
Answer: Aeroponics
26
Which one of the following is NOT a criteria for an element to be called as essential?
Answer: These elements need not to take part in growth and development
27
Most of the plants obtain nitrogen from the soil in the form of
Answer: Nitrates
29
Which one of the following essential elements can land plants normally obtain directly from the air
Answer: Carbon
31
Which of the following elements is not required by plant for their healthy normal growth
Answer: Lead
33
Plants absorb mineral salts from the soil solution through
Answer: Semipermeable membrane into the cytoplasm
36
A fertilizer has a formula of three figures 15-9-9. They stand for percentage of
Answer: N, P and K
39
Aeroponics is growing plants in
Answer: Stands with liquid spray of their roots
