The elements known as primary nutrients for plants (1) Nitrogen, Phosphorus and Potassium (2) Nitrogen, Oxygen and Silicon (3) Potassium, Boron and Nitrogen (4) Nitrogen, Phosphorus and Iron

The elements known as primary nutrients for plants (1) Nitrogen, Phosphorus and Potassium (2) Nitrogen, Oxygen and Silicon (3) Potassium, Boron and Nitrogen (4) Nitrogen, Phosphorus and Iron
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(1) Nitrogen, Phosphorus and Potassium Explanation: Nitrogen (N), Phosphorus (P) and Potassium (K) are considered as the three essential or primary nutrients for plants. Together they make up the trio known as NPK. Other important nutrients are calcium, magnesium and sulfur. Plants also need small quantities of iron, manganese, zinc, copper, boron and molybdenum, known as trace elements
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The elements known as primary nutrients for plants (1) Nitrogen, Phosphorus and Potassium (2) Nitrogen, Oxygen and Silicon (3) Potassium, Boron and Nitrogen (4) Nitrogen, Phosphorus and Iron

Description : The elements known as primary nutrients for plants (1) Nitrogen, Phosphorus and Potassium (2) Nitrogen, Oxygen and Silicon (3) Potassium, Boron and Nitrogen (4) Nitrogen, Phosphorus and Iron

Last Answer : Nitrogen, Phosphorus and Potassium

Which of the following groups of elements have an OUTER ELECTRONIC configuration of S-2-P-2? w) halogens x) Nitrogen-Phosphorus Group y) Carbon-Silicon Group z) Boron-Aluminum Group

Description : Which of the following groups of elements have an OUTER ELECTRONIC configuration of S-2-P-2? w) halogens x) Nitrogen-Phosphorus Group y) Carbon-Silicon Group z) Boron-Aluminum Group

Last Answer : ANSWER: Y -- CARBON-SILICON GROUP

Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorus (3) Potassium (4) Silicon

Description : Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorus (3) Potassium (4) Silicon

Last Answer : (4) Silicon Explanation: Commercial Fertilizers - a substance containing one or more recognized plant nutrients and that is used for its plant nutrient content or that is designated for use or claimed to have value in promoting plant growth.

The three numbers on fertilizer represents the value of the three macro-nutrients used by plants represented as NPK for short. What are they? a. Neon, Phosphorous, Krypton b. Nitrogen, Phosphorus, Potassium c. Neon, Potassium, Krypton d. Neon, Potassium, Phosphorous

Description : The three numbers on fertilizer represents the value of the three macro-nutrients used by plants represented as NPK for short. What are they? a. Neon, Phosphorous, Krypton b. Nitrogen, Phosphorus, Potassium c. Neon, Potassium, Krypton d. Neon, Potassium, Phosphorous

Last Answer : b. Nitrogen, Phosphorus, Potassium

The three numbers on fertilizer represents the value of the three macro-nutrients used by plants represented as NPK for short. What are they? a. Neon, Phosphorous, Krypton b. Nitrogen, Phosphorus, Potassium c. Neon, Potassium, Krypton d. Neon, Potassium, Phosphorous

Description : The three numbers on fertilizer represents the value of the three macro-nutrients used by plants represented as NPK for short. What are they? a. Neon, Phosphorous, Krypton b. Nitrogen, Phosphorus, Potassium c. Neon, Potassium, Krypton d. Neon, Potassium, Phosphorous

Last Answer : b. Nitrogen, Phosphorus, Potassium

Minerals known to be required in large amounts for plant growth include (a) potassium, phosphorus, selenium, boron (b) magnesium, sulphur, iron, zinc (c) phosphorus, potassium, sulphur, calcium (d) calcium, magnesium, manganese, copper.

Description : Minerals known to be required in large amounts for plant growth include (a) potassium, phosphorus, selenium, boron (b) magnesium, sulphur, iron, zinc (c) phosphorus, potassium, sulphur, calcium (d) calcium, magnesium, manganese, copper.

Last Answer : (c) phosphorus, potassium, sulphur, calcium

Red soil is poor in which of the following nutrients ? (A) Phosphorus and Sulphur (B) Phosphorus and Nitrogen (C) Nitrogen and Zinc (D) Nitrogen and Potassium

Description : Red soil is poor in which of the following nutrients ? (A) Phosphorus and Sulphur (B) Phosphorus and Nitrogen (C) Nitrogen and Zinc (D) Nitrogen and Potassium

Last Answer : (D) Nitrogen and Potassium

In which of the following all three are macronutrients? (a) Molybdenum, magnesium, manganese (b) Nitrogen, nickel, phosphorus (c) Boron, zinc, manganese (d) Iron, copper, molybdenum

Description : In which of the following all three are macronutrients? (a) Molybdenum, magnesium, manganese (b) Nitrogen, nickel, phosphorus (c) Boron, zinc, manganese (d) Iron, copper, molybdenum

Last Answer : (d) Iron, copper, molybdenum

What is the main function of zinc in the plants ? (A) Synthesis of nitrogen (B) Synthesis of phosphorus (C) Required for synthesis of Tryptophos (D) To increase activity of the boron

Description : What is the main function of zinc in the plants ? (A) Synthesis of nitrogen (B) Synthesis of phosphorus (C) Required for synthesis of Tryptophos (D) To increase activity of the boron

Last Answer : (C) Required for synthesis of Tryptophos

Which of the following elements is essential for the storage of energy in plants? a. Nitrogen b. Oxygen c. Carbon d. Phosphorus

Description : Which of the following elements is essential for the storage of energy in plants? a. Nitrogen b. Oxygen c. Carbon d. Phosphorus

Last Answer : d. Phosphorus

Which of the following elements is essential for the storage of energy in plants? a. Nitrogen b. Oxygen c. Carbon d. Phosphorus

Description : Which of the following elements is essential for the storage of energy in plants? a. Nitrogen b. Oxygen c. Carbon d. Phosphorus

Last Answer : d. Phosphorus

Which one of the following elements is least likely to be found in commercial fertilizers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Description : Which one of the following elements is least likely to be found in commercial fertilizers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Last Answer : (4) Silicon Explanation: Fertilizers typically provide, in varying proportions: (1) six macronutrients: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S); and (ii) eight ... copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn) and nickel {Ni}.

Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Description : Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Last Answer : Silicon

Silicon crystal can be converted to p-type semi-conductor by doping with (A) Phosphorous (B) Nitrogen (C) Carbon (D) Boron

Description : Silicon crystal can be converted to p-type semi-conductor by doping with (A) Phosphorous (B) Nitrogen (C) Carbon (D) Boron

Last Answer : Option D

Which one of the following elements in plants is not remobilised? (a) Phosphorus (b) Calcium (c) Potassium (d) Sulphur

Description : Which one of the following elements in plants is not remobilised? (a) Phosphorus (b) Calcium (c) Potassium (d) Sulphur

Last Answer : (b) Calcium

Which of these is a micronutrient for plants? (1) Carbon (2) Oxygen (3) Nitrogen (4) Boron

Description : Which of these is a micronutrient for plants? (1) Carbon (2) Oxygen (3) Nitrogen (4) Boron

Last Answer : Boron

About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and (a) sulphur and magnesium (b) magnesium and sodium (c) calcium and phosphorus (d) phosphorus and sulphur.

Description : About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and (a) sulphur and magnesium (b) magnesium and sodium (c) calcium and phosphorus (d) phosphorus and sulphur.

Last Answer : (d) phosphorus and sulphur.

Metalloids (A) Are good conductor of heat & electricity (B) Act as electron donors with metals & as electron acceptor with non metals (C) Are not necessarily solids at room temperature (D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Description : Metalloids (A) Are good conductor of heat & electricity (B) Act as electron donors with metals & as electron acceptor with non metals (C) Are not necessarily solids at room temperature ... & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

When the Exxon Valdez oil spill occurred, technologists "fertilized" the oil-soaked water with _____ to modify the environment and stimulate he growth of naturally occurring microorganisms. a. nitrogen sources (e.g., urea) b. phosphorus compounds c. other mineral nutrients d. A-C above are correct

Description : When the Exxon Valdez oil spill occurred, technologists "fertilized" the oil-soaked water with _____ to modify the environment and stimulate he growth of naturally occurring microorganisms. a. nitrogen sources (e.g., urea) b. phosphorus compounds c. other mineral nutrients d. A-C above are correct

Last Answer : d. A-C above are correct

Which one of the following element is mobile in plants but immobile in soil ? (A) Sulphur (B) Zinc (C) Boron (D) Phosphorus

Description : Which one of the following element is mobile in plants but immobile in soil ? (A) Sulphur (B) Zinc (C) Boron (D) Phosphorus

Last Answer : (D) Phosphorus

Match the following concerning essential elements and their functions in plants. Column-I Column-II (A) Iron (i) Photolysis of water (B) Zinc (ii) Pollen germination (C) Boron (iii) Required for chlorophyll biosynthesis (D) Manganese (iv) IAA biosynthesis

Description : Match the following concerning essential elements and their functions in plants. Column-I Column-II (A) Iron (i) Photolysis of water (B) Zinc (ii) Pollen germination (C) Boron (iii) Required for chlorophyll biosynthesis (D) Manganese (iv) IAA biosynthesis

Last Answer : (c) (iii) (iv) (ii) (i)

(2) Nitrogen, Phosphorous and Sodium Explanation: Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a soil to supply one or more plant nutrients essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen.

Description : (2) Nitrogen, Phosphorous and Sodium Explanation: Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a ... essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen.

Last Answer : Metal are good conductors, because – (1) they contain free electrons (2) the molecules in them are very close to each other (3) the molecules in them collide very freely (4) they contain reflecting surface

Which of the following elements has the atomic number greater than that of Phosphorus? (1) Aluminium (2) Silicon (3) Chlorine (4) Magnesium

Description : Which of the following elements has the atomic number greater than that of Phosphorus? (1) Aluminium (2) Silicon (3) Chlorine (4) Magnesium

Last Answer : (3) Chlorine Explanation: Chlorine is a chemical element with symbol Cl and atomic number 17. Phosphorus is a chemical element with symbol P and atomic number 15.

Which one of the following constitutes natural silk? (a) Nitrogen (b) Magnesium (c) Potassium (d) Phosphorus

Description : Which one of the following constitutes natural silk? (a) Nitrogen (b) Magnesium (c) Potassium (d) Phosphorus

Last Answer : (a) Nitrogen

If in the rice crop field, the leaves turn narrow, short, erect, and lemon yellowish and the entire field may appear yellowish, then the rice may be deficient of which nutrient? a. Calcium b. Potassium c. Nitrogen d. Phosphorus

Description : If in the rice crop field, the leaves turn narrow, short, erect, and lemon yellowish and the entire field may appear yellowish, then the rice may be deficient of which nutrient? a. Calcium b. Potassium c. Nitrogen d. Phosphorus

Last Answer : c. Nitrogen

Atomic number of which of the following elements is greater than that of Fluorine? (1) Sodium (2) Beryllium (3) Nitrogen (4) Boron

Description : Atomic number of which of the following elements is greater than that of Fluorine? (1) Sodium (2) Beryllium (3) Nitrogen (4) Boron

Last Answer : (1) Sodium Explanation: Sodium has higher atomic number (11) than Fluorine (9) The atomic number of Beryllium and Nitrogen are 4 and 7 respectively.

Which of the following nutrient is involved in reproduction in plants and germination of pollen grains ? a. Boron b. Calcium c. Potassium d. Sulphur

Description : Which of the following nutrient is involved in reproduction in plants and germination of pollen grains ? a. Boron b. Calcium c. Potassium d. Sulphur

Last Answer : a. Boron

Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property? (A) Silicon (B) Phosphorus (C) Sulphur (D) None of these

Description : Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property? (A) Silicon (B) Phosphorus (C) Sulphur (D) None of these

Last Answer : (A) Silicon

Iron ore may contain (A) Carbon (B) Silicon (C) Phosphorus and manganese (D) All the above

Description : Iron ore may contain (A) Carbon (B) Silicon (C) Phosphorus and manganese (D) All the above

Last Answer : Answer: Option D

Red short iron cracks when bent due to the presence of (A) Sulphur (B) Carbon (C) Phosphorus (D) Silicon

Description : Red short iron cracks when bent due to the presence of (A) Sulphur (B) Carbon (C) Phosphorus (D) Silicon

Last Answer : Answer: Option A

Inside the ____ is a gas generator containing a mixture of NaN3 (Sodium Azide), KNO3 (Potassium Nitrate) and SiO2 (Silicon Dioxide). When the undesired event happens, an electric circuit is turned on by a sensor, and a series of chemical reactions generate nitrogen gas that fills ____ in 20 to 30 milliseconds. Fill up the blank

Description : Inside the ____ is a gas generator containing a mixture of NaN3 (Sodium Azide), KNO3 (Potassium Nitrate) and SiO2 (Silicon Dioxide). When the undesired event happens, an electric circuit is ... chemical reactions generate nitrogen gas that fills ____ in 20 to 30 milliseconds. Fill up the blank

Last Answer : Air-bags in automobiles.

Milk is deficient of which mineral? (A) Phosphorus (B) Sodium (C) Iron (D) Potassium

Description : Milk is deficient of which mineral? (A) Phosphorus (B) Sodium (C) Iron (D) Potassium

Last Answer : C

The deficiency of this element leads to older leaves turning purple in colour on the underside. Identify the mineral? [a] Calcium [b] Phosphorus [c] Potassium [d] Iron [e] None of the above

Description : The deficiency of this element leads to older leaves turning purple in colour on the underside. Identify the mineral? [a] Calcium [b] Phosphorus [c] Potassium [d] Iron [e] None of the above

Last Answer : [c] Potassium

Milk is deficient of which mineral? (A) Phosphorus (B) Sodium (C) Iron (D) Potassium

Description : Milk is deficient of which mineral? (A) Phosphorus (B) Sodium (C) Iron (D) Potassium

Last Answer : (C) Iron

Which mineral is a source of phosphorus and boron in soils?

Description : Which mineral is a source of phosphorus and boron in soils?

Last Answer : Ans. Apetite

Which of the following elements is not present in a nitrogenous base? (a) Hydrogen (b) Carbon (c) Phosphorus (d) Nitrogen

Description : Which of the following elements is not present in a nitrogenous base? (a) Hydrogen (b) Carbon (c) Phosphorus (d) Nitrogen

Last Answer : (c) Phosphorus

Of the nonmetallic elements the one least likely to be found in organic compounds is: w) nitrogen x) phosphorus y) chlorine z) selenium

Description : Of the nonmetallic elements the one least likely to be found in organic compounds is: w) nitrogen x) phosphorus y) chlorine z) selenium

Last Answer : ANSWER: Z -- SELENIUM

One of the following mineral is essential for life of animals and rot for plants (a) Calcium (b) Phosphorus (c) Iodine (d) Potassium

Description : One of the following mineral is essential for life of animals and rot for plants (a) Calcium (b) Phosphorus (c) Iodine (d) Potassium

Last Answer : (b) Phosphorus

Which of the following pairs is a sedimentary type of biogeochemical cycle? (a) Phosphorus and nitrogen (b) Phosphorus and sulphur (c) Oxygen and nitrogen (d) Phosphorus and carbon dioxide

Description : Which of the following pairs is a sedimentary type of biogeochemical cycle? (a) Phosphorus and nitrogen (b) Phosphorus and sulphur (c) Oxygen and nitrogen (d) Phosphorus and carbon dioxide

Last Answer : (b) Phosphorus and sulphur

Both rubies and sapphires contain (a) silicon dioxide (b) lead tetroxide (c) aluminium oxide (d) boron nitride

Description : Both rubies and sapphires contain (a) silicon dioxide (b) lead tetroxide (c) aluminium oxide (d) boron nitride

Last Answer : Ans:(c)

The main constituent of carborundum is __________ carbide. (A) Calcium (B) Silicon (C) Boron (D) Aluminium

Description : The main constituent of carborundum is __________ carbide. (A) Calcium (B) Silicon (C) Boron (D) Aluminium

Last Answer : (B) Silicon

Why cannot thousands of compounds of Boron or silicon or germanium not possible?

Description : Why cannot thousands of compounds of Boron or silicon or germanium not possible?

Last Answer : Even though B-B, Si-Si, Ge-Ge bonds exits, these compounds are unstable and very reactive and do not last long.

Carborundum consists mainly of (A) Bauxite (B) Silicon carbide (C) Boron carbide (D) Calcium carbide

Description : Carborundum consists mainly of (A) Bauxite (B) Silicon carbide (C) Boron carbide (D) Calcium carbide

Last Answer : (B) Silicon carbide

_________ is the hardest material out of the following. (A) Boron carbide (B) Tungsten carbide (C) Hardened steel (D) Silicon carbide

Description : _________ is the hardest material out of the following. (A) Boron carbide (B) Tungsten carbide (C) Hardened steel (D) Silicon carbide

Last Answer : (A) Boron carbide

hich of the following is the most suitable abrasive for grinding high tensile strength materials? (A) Silicon carbide (B) Corundum (C) Aluminium oxide (D) Boron carbide

Description : hich of the following is the most suitable abrasive for grinding high tensile strength materials? (A) Silicon carbide (B) Corundum (C) Aluminium oxide (D) Boron carbide

Last Answer : Option C

Which of the following is not a covalent network solid? w) silicon dioxide x) silicon oxide y) boron nitrate z) sodium oxide

Description : Which of the following is not a covalent network solid? w) silicon dioxide x) silicon oxide y) boron nitrate z) sodium oxide

Last Answer : ANSWER: D -- SODIUM OXIDE

Which among the following elements increases the absorption of water and calcium in plants? (1) Manganese (2) Boron (3) Copper (4) Molybdenum

Description : Which among the following elements increases the absorption of water and calcium in plants? (1) Manganese (2) Boron (3) Copper (4) Molybdenum

Last Answer : (2) Boron Explanation: Boron increases the absorption of water and calcium in the plants. It helps in the metabolic activities in plants. Boron is necessary in order for sugar to move through protoplasmic membranes.

Which of the following elements is not essential element of plants but proves to be beneficial for some plants? a) Boron b) Sodium c) Iodine d) Copper

Description : Which of the following elements is not essential element of plants but proves to be beneficial for some plants? a) Boron b) Sodium c) Iodine d) Copper

Last Answer : b) Sodium

Which of the following elements is not essential element of plants but proves to be beneficial for some plants?a) Boron b) Sodium c) Iodine d) Copper

Description : Which of the following elements is not essential element of plants but proves to be beneficial for some plants?a) Boron b) Sodium c) Iodine d) Copper

Last Answer : b) Sodium

Which among the following elements increases the absorption of water and calcium in plants ? (1) Manganese (2) Boron (3) Copper (4) Molybdenum

Description : Which among the following elements increases the absorption of water and calcium in plants ? (1) Manganese (2) Boron (3) Copper (4) Molybdenum

Last Answer : Boron