Toxicity of Micronutrients

Q. What is the difference between repolarization depolarization and hyperpolarizing

Q. Appearance of brown spots surrounded by chlorotic veins is a toxic symptom caused due to

1. Mo.
2. Zn.
3. Mg.
4. Mn

Q. Excess of mangnese may induce deficiencies of

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

Q.

Manganese toxicity results in deficiency of iron, magnesium and calcium because:

1. It competes with calcium and magnesium for uptake and inhibits iron translocation in the shoot apex

2. It prevents the translocation of iron, magnesium, and calcium from roots to the shoot

3. It competes with iron and magnesium for uptake and inhibits calcium translocation in the shoot apex

4. It inhibits iron and calcium translocation and binding of magnesium with enzymes

Q. This question consists of two statements, Assertion and Reason. While answering this question you are required to choose any one of the following five responses.

Assertion: Main constituent of human urine is ammonia.

Reason: If human urine is allowed to stand for some time, it smells strongly of ammonia.

Q. Prominent symptom caused by manganese toxicity is

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

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 inhibit calcium translocation in shoot.
3. Manganese toxicity leads to stunted growth
4. Manganese toxicity leads to increase in iron uptake

Q. Animal, excreting urea produced during metabolism of amino acid is

1. ureotelism
2. uricotelism
3. ammonotelism
4. aminotelism

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. Any mineral ion concentration that reduces the dry weight by 10% per unit is considered as

1. Toxic

2. Critical

3. Lethal

4. Deficient

Q. Which of the following group of animals contains only uricotelic organisms?

1. Reptiles, birds, land snails, insects
2. Reptiles, birds, land snails, aquatic insects
3. Amphibians, birds, land snails, insects
4. Amphibians, Reptiles, birds, insects

Q. Select an incorrect option

1. A moderate increase or decrease of trace elements causes deficiency and toxicity respectively
2. Toxicity of manganese causes deficiency of calcium
3. None of the above
4. Water & mineral elements are tranported via xylem

Q. Assertion (A): The symptoms of manganese toxicity are actually the deficiency symptoms of Fe, Mg and Ca.
Reason (R): Mn competes with Fe and Mg for uptake and also inhibits Ca translocation in the shoot apex.

1. Both A & R are true and R explains A

2. Both A & R are true and R does not explain A

3. A is true and R is true

4. Both A & R are false

Q. Assertion: Wrapping food in newspaper can be dangerous
Reason : It is rich in cadmium, which is toxic to health

1. Both assertion and reason are correct and reason is the correct explanation of assertion
2. Both assertion and reason are correct, but reason is not the correct explanation of assertion
3. Assertion is correct, reason is incorrect
4. Both assertion and reason are incorrect

Q. Plant ash is an indication of

1. Organic matter of plant
2. Waste product
3. Mineral salts absorbed by plants
4. None of these

Q. Which statement is incorrect for ion – channels?

1. They are proteins
2. Movement through them is simple diffusion
3. Movement through then is from high to low concentration.
4. All ions pass through the same type of channel.

Q.

Plants usually require micronutrients in very low concentrations. However, if the concentration of micronutrients increases, it leads to ________.

1. Toxicity

2. deficiency symptoms

3. Cell differentiation

4. Cell elongation

Q. Excretion of nitrogenous wastes in semisolid form is found in

1. Ammonotelic animals
2. Uricotelic animals
3. Ureotelic animals
4. Aminotelic animals

Q. Assertion :The prominent symptom of manganese toxicity is the apperance of brown spots surrounded by chlorotic veins. Reason: Excess of mangnese may induce deficiencies of iron, magnesium and calcium.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Excess of mangnese may induce deficiencies of

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

Q. Give reason for the following.
Sodium and potassium are stored in Kerosene.

Q. The following substances are the excretory products in animals. Choose the least toxic from among them ?

1. Urea
2. Uric acid
3. Ammonia
4. Carbon dioxide

Q.

What can excess manganese induce?

Q.

Manganese toxicity results in deficiency of iron, magnesium and calcium because:

1. It competes with iron and magnesium for uptake and inhibits calcium translocation in the shoot apex

2. It inhibits iron and calcium translocation and binding of magnesium with enzymes

3. It competes with calcium and magnesium for uptake and inhibits iron translocation in the shoot apex

4. It prevents the translocation of iron, magnesium, and calcium from roots to the shoot

Q.

A micronutrient causes toxicity when:

1. Its concentration is higher than required by the plant

2. Its concentration in a tissue reduces the dry weight of the tissue by about 10%

3. Its concentration results in symptoms like necrosis or chlorosis

4. Its concentration in a tissue inhibits the action of certain enzymes

Q. Assertion (A): The symptoms of manganese toxicity are actually the deficiency symptoms of Fe, Mg and Ca.
Reason (R): Mn competes with Fe and Mg for uptake and also inhibits Ca translocation in the shoot apex.

1. Both A & R are true and R explains A
2. Both A & R are true and R does not explain A
3. A is true and R is true
4. Both A & R are false

Q.

When is a mineral considered toxic to plant tissues?

Q. Very Short Answer Type :
Jamming of wooden doors and windows takes place during rainy season. Give reason.

Q.

Which one of the following symptoms is not due to manganese toxicity in plants?

1. None of the above

2. Deficiency in both Iron and Nitrogen is induced

3. Appearance of brown spot surrounded by chlorotic veins

4. Calcium translocation in shoot apex is inhibited

Q. Low calorie sweetener protein used by the people of West Africa is

1. Brazzein
2. Glycine
3. Saponin
4. Serine