Mineral Nutrition Test

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Mineral Nutrition Test - 77

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Weekly Quiz Competition

Question 1
1 / -0

Deficiency of molybdenum leads to

A
Mottling and necrosis of leaves

B
Yellowing of leaves

C
Bending of leaves

D
All of the above

Solution

Molybdenum is an essential micronutrient required as activator of certain enzymes, involved in nitrogen metabolism including nitrate reduction and nitrogen fixation, ascorbic acid oxidase etc. Molybdenum deficiency leads to mottling chlorosis with bending or infolding of leaves, whiptail in crucifers, withering in monocots and loosening of cauliflower head. The chlorosis leads to yellowing of leaves.
Question 2
1 / -0

Zinc is a precursor of:

A
Amino acid oxidase

B
Tryptophan synthetase

C
Succinic acid dehydrogenase

D
PEPCO

Solution

Zinc is an essential micronutrient for plants. Plants obtain zinc as $$Zn^{2+}$$ ions. It activates various enzymes, especially carboxylases. It is also needed in the synthesis of auxin because it is an activator of tryptophan synthetase.
So, the correct answer is option B.
Question 3
1 / -0

All of the following statements concerning the actinomycetes filamentous soil bacterium, Frankia are correct except that Frankia

A
Can induce root nodules on many plant species

B
Cannot fix nitrogen in the free-living state

C
Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex

D
Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids

Solution

Frankia, aerobic Gram-positive actinomycetes can induce root nodules in about 8 families. These bacteria cannot fix nitrogen in free living state. They can infect the host root by intracellularly by infecting curled root hair or intercellularly by penetrating between two rhizoderm cells and then progress toward cortical cells. These bacteria in free-living state form diazovesicles containing nitrogenase which is protected from oxygen by a series of laminated lipid layers.
So all the statements are correct.
Question 4
1 / -0

The main response of boron-deficiency is visible in

A
Meristematic region

B
Cortical region

C
Vascular region

D
Endodermal region

Solution

Boron is an essential micronutrient. It is required by meristematic cells at root and stem tips. It is essential for calcium metabolism, pollen germination, cell differentiation, carbohydrate transport, root nodulation, synthesis of pectin, proteins and nucleic acids, membrane functions, cell elongation and cell differentiation.
Question 5
1 / -0

Which of the following plants take $$N_2$$ from insects?

A
Dionaea

B
Viscum and Nepenthes

C
Aldrovanda, Dischidia and Utricularia

D
All of the above

Solution

Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. These plants usually grow in swamps.
Dionaea is one such plant. It is commonly called venus flytrap and catches flies with the help of toothed leaves.
Viscum is an obligate parasite shrub.
Aldrovanda is a carnivorous plant. The trap mechanism is akin to that present in Dionaea.
Dischidia is a genus of plants in the milkweed family, Apocynaceae. They are epiphytes native to tropical areas of China and India.
Viscum is a partial stem parasite.
Nepenthes is the common pitcher plant.

So, the correct answer is option A.
Question 6
1 / -0

Select the correct match.
Disease
Symptoms
A. Exotic
I. Overgrowth or over development
B. Necrotic
II. Slowing down the growth
C. Atrophic
III. Death of tissues
D. Hypertrophic
IV. Newly introduced

A
A- IV, B- III, C- II, D- I

B
A- III, B- III, C- I, D- IV

C
A- II, B- I, C- IV, D- III

D
A- I, B- IV, C- III, D- II
Solution
- Exotic refers to newly introduced species from outside or some other ecosystem. Local species are called indigenous species.
- Necrosis is a plant deficiency or disease symptom, which means the death of tissue.
- Atrophic means some external factor, which is responsible for slowing down or stopping growth.
- Trophic movements are the growth movements, like phototrophic means growth movement due to light. Geotropic means growth movement due to gravity.
- "Hyper" means more or excess, so hypertrophic refers to more growth or excess growth.
- Thus, the correct answer is (A).
Question 7
1 / -0

'Drought spot' is a disease of apple caused due to deficiency of

A
Deficiency of nitrogen

B
Deficiency of boron

C
Deficiency of hydrogen

D
Deficiency of potassium

Solution

Boron is an essential micronutrient. It is responsible for calcium metabolism, pollen germination, cell differentiation, carbohydrate transport, root nodulation etc. Its deficiency leads to browning of cauliflower, heart rot or brown rot of sugar beet and turnip, internal cork or drought spot of apple, stunted growth and rosetting of leaves and small size of fruits.
Question 8
1 / -0

Which one of the following is called as balancing element?

A
Zn

B
Na

C
Ca

D
B
Solution
- Balancing elements are elements, which overcome the toxic effects of other elements.
- Some of the common balancing elements are calcium, magnesium, and potassium that protect plants against toxic effects of manganese, nickel, zinc, boron, copper, and lead.
Question 9
1 / -0

Foliar absorption of iron helps in rapid recovery from iron deficiency. It is sprayed in the form of

A
$$FeSO_4$$

B
FeCl

C
Fe-EDTA

D
Na-EDTA

Solution

EDTA stands to denote 'Ethylene Diamine Tetra Acetic acid'. It binds metal ions. Its usefulness arises, because of its role as a hexadentate ("six toothed") ligand and chelating agent, i.e., has ability to "sequester" metal ions, such as $$Ca^{2+}$$ and $$Fe^{3+}$$.
After being bound by EDTA, metal ions remain in solution but exhibit diminished reactivity. Iron in such a form is highly useful for plants and can be used in case of iron deficiency.
Question 10
1 / -0

One of the free-living anaerobic nitrogen-fixing bacteria is

A
Azotobacter

B
Beijernickia

C
Rhodospirillum

D
Rhizobium

Solution

Plants do not directly absorb atmospheric nitrogen. In nature a nitrogen cycle is operational which continuously shuttles nitrogen between the living and non living components of ecosystem. Nitrogen fixation is the process of converting inert atmospheric nitrogen into utilisable compounds like nitrate and ammonia. In nature a variety of organisms carry out the process of nitrogen fixation. Azotobacter and Beijerinckia are aerobic free living nitrogen fixing organisms. Rhodospirillum is another free living nitrogen fixing bacteria. It is a facultative anaerobe, it can therefore use alcoholic fermentation under low oxygen conditions or use aerobic respiration in aerobic conditions. Rhizobium is symbiotic nitrogen fixer found in the root nodules of legume plants.

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Disease	Symptoms
A. Exotic	I. Overgrowth or over development
B. Necrotic	II. Slowing down the growth
C. Atrophic	III. Death of tissues
D. Hypertrophic	IV. Newly introduced

Mineral Nutrition Test - 77

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Mineral Nutrition Test - 77

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Question 1

Mottling and necrosis of leaves

Yellowing of leaves

Bending of leaves

All of the above

Solution

Question 2

Amino acid oxidase

Tryptophan synthetase

Succinic acid dehydrogenase

PEPCO

Solution

Question 3

Can induce root nodules on many plant species

Cannot fix nitrogen in the free-living state

Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex

Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids

Solution

Question 4

Meristematic region

Cortical region

Vascular region

Endodermal region

Solution

Question 5

Dionaea

Viscum and Nepenthes

Aldrovanda, Dischidia and Utricularia

All of the above

Solution

Question 6

A- IV, B- III, C- II, D- I

A- III, B- III, C- I, D- IV

A- II, B- I, C- IV, D- III

A- I, B- IV, C- III, D- II

Solution

Question 7

Deficiency of nitrogen

Deficiency of boron

Deficiency of hydrogen

Deficiency of potassium

Solution

Question 8

Zn

Na

Ca

B

Solution

Question 9

$$FeSO_4$$

FeCl

Fe-EDTA

Na-EDTA

Solution

Question 10

Azotobacter

Beijernickia

Rhodospirillum

Rhizobium

Solution

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