Question contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : Hydroponics is used for solution culture.
Statement 2: A balanced nutrient solution contains both essential and nonessential elements.

Statement- 1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement -1
Statement -1 is True, Statement -2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement - 1 is True, Statement- 2 is False
Both the Statements are False.

Solution

Solution culture is being used for raising flowers and vegetables at home. This soilless production of plants is called hydroponics. A solution having all the essential elements in proper proportion is called normal or balanced nutrient solution.

One of the free -living, anaerobic nitrogen – fixeris:

Beijernickia
Rhodospirillum
Rhizobium
Azotobacter

Which one of the following is not a micronutrient?

Molybdenum
Magnesium
Zinc
Boron

Solution

Magnesium is a macronutrient. Micronutrients are essential elements that are required by plants in small amount. They include Fe, Cu, B, Mo, Mn, Cl, and Ni.Macronutrients, on the other hand, are those essential elements that are required by plants in larger amount. The examples include C, H, O, N,S, P, K,Ca and Mg.

An element playing important role in nitrogen fixation is :

Molybdenum
Copper
Manganese
Zinc

Solution

Molybdenum is a micronutrient that plays an important role in nitrogen fixation. It is a part of nitrate reductase enzyme that helps in nitrogen fixation.

Which of the following is a symbiotic nitrogen fixer?

Azotobacter
Frankia
Azolla
Glomus

Solution

Frankia is symbiotic nitrogen fixerin root nodules of several non-legume plants like Casurina and Alnus

Which one of the following pairs is wrongly matched?

Alcohol - nitrogenase
Fruit juice - pectinase
Textile - amylase
Detergents - lipase

Solution

Alcohol and nitrogenase pair is wrongly matched. Ethanol produces alcohol.

Manganese is required in:

plant cell wall formation
photolysis of water during photosynthesis
chlorophyll synthesis
nucleic acid synthesis

Solution

Manganese is essential for many plant functions. Some of them are:
•The assimilation of carbon dioxide in photosynthesis.
•It is involved in the Hill Reaction where water is split during photosynthesis.
•It aids in the synthesis of chlorophyll and in nitrate assimilation.
•Manganese activates fat forming enzymes.
•It functions in the formation of riboflavin, ascorbic acid,and carotene.
•It functions in electron transport during photosynthesis.

Which one of the following elements is not an essential micronutrient for plant growth?

Solution

Essential micro elements are Fe, Mn, Zn, B, Cu, Mo and essential macro nutrionts are C,H,N, P, S, Ca, K, Mg.

A plant requires magnesium for

A plant requires magnesium for chlorophyll synthesis. All four rings bind with metal atom magnesium (Mg⁺⁺), which remain present at the center of chlorophyll molecule.

protein synthesis
chlorophyll synthesis
cell wall development
holding cells together

The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below,which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport:

Co,Ni, Mo
Ca, K, Na
Mn, Co, Ca
Cu, Mn, Fe

Solution

Copper : Electron transfer (CU⁺ ⇌ CU²⁺) Maintenance of carbohydrate / nitrogen balance, chlorophyll synthesis.
Iron : Electron transport in photosynthesis and respiration(Fe²⁺ ⇌ Fe³⁺)development of chloroplasts,chlorophyll and other pigments, protein synthesis.
Manganese: Metabolism and photolytic evolution of oxygen.

UnAttempted

0

Attempted

0

Correct

0

Wrong

0

Complete