${\mathrm{Zn}}^{2+}$ is an activator of the enzyme:

1. RuBisCO	2. PEP carboxylase
3. Nitrogenase	4. Alcohol dehydrogenase

An essential element categorized in elements that can alter the osmotic potential of a cell will be:

Identify the element that is not obtained by terrestrial plants primarily from soil?

A plant requires magnesium mainly for:

Which of the following elements is a constituent of vitamins such as thiamine, biotin and Coenzyme A?

The two elements required for splitting of water to liberate oxygen during photosynthesis are:
1. Manganese and Chlorine
2. Manganese and Boron
3. Copper and Chlorine
4. Molybdenum and Magnesium

Identify the element required by plants for utilization of calcium and pollen germination:

The deficiency symptoms of which of the following tends to first appear in young tissues?

The deficiency of nitrogen or molybdenum can cause all except:
1. Chlorosis
2. Inhibition of cell division
3. Necrosis of leaf tissue
4. Delay in flowering

Any mineral ion concentration is considered toxic to plants if it reduces the dry weight of tissues by: