Toxicity of Micronutrients

Q. Excess of mangnese may induce deficiencies of

1. iron
2. calcium
3. magnesium
4. all of these

Q. If dry weight of a plant is reduced by ______ % then the concentration at which this occurs is considered toxic.

1. 5
2. 10
3. 15
4. 20

Q. An increase in the amount of micronutrients can cause toxicity in the plants.

1. False
2. True

Q. Prominent symptom caused by manganese toxicity is

1. delay in flowering
2. necrosis i.e death of tissue maybe in leaves
3. brown spots encompassed by chlorotic veins
4. none of the above

Q. Identify the correct statement with regard to manganese toxicity:

1. Manganese toxicity increases magnesium uptake and helps it to bind with the enzymes
2. Manganese toxicity leads to stunted growth
3. Manganese toxicity inhibit calcium translocation in shoot.
4. Manganese toxicity leads to increase in iron uptake

Q. Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?