It has been observed that with more CO2, in the air, crop yield has ………………… 

It has been observed that with more CO2, in the air, crop yield has ………………… 
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Choose the correct option by identifying the correct correlation in the sentence: It has been observed that ... (c) remained constant (d) changed
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During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of (a) CO2 (b) light (c) temperature (d) water.

Description : During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of (a) CO2 (b) light (c) temperature (d) water.

Last Answer : (b) light

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct? (a) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate.(b) C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum. (c) Tomato is a greenhouse crop which can be grown in CO2-enriched atmosphere for higher yield. (d) Light saturation for CO2 fixation occurs at 10% of full sunlight.

Description : With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct? (a) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate. ( ... for higher yield. (d) Light saturation for CO2 fixation occurs at 10% of full sunlight.

Last Answer : (b) C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum

Salinization occurs when the irrigation water accumulated in the soil evaporates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land? a. It greatly increases the crop production b. It may lead to crop yield loss c. It raises the water table d. It fills the air spaces in the soil with water

Description : Salinization occurs when the irrigation water accumulated in the soil evaporates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land? a. It greatly increases the crop ... c. It raises the water table d. It fills the air spaces in the soil with water

Last Answer : b. It may lead to crop yield loss

High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes (A) Cancer (B) Silicosis (C) Respiratory disease (e.g., asthma) (D) Reduced crop yield

Description : High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes (A) Cancer (B) Silicosis (C) Respiratory disease (e.g., asthma) (D) Reduced crop yield

Last Answer : (A) Cancer

The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element. (A) Silicon (B) Carbon (C) Phosphorous (D) Chromium

Description : The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element. (A) Silicon (B) Carbon (C) Phosphorous (D) Chromium

Last Answer : Option B

If glucose-1-phosphate formed by glycogenoloysis in muscles is oxidized to CO2 and H2O, the energy yield will be (A) 2 ATP equivalents (B) 3 ATP equivalents (C) 4 ATP equivalents (D) 8 ATP equivalents

Description : If glucose-1-phosphate formed by glycogenoloysis in muscles is oxidized to CO2 and H2O, the energy yield will be (A) 2 ATP equivalents (B) 3 ATP equivalents (C) 4 ATP equivalents (D) 8 ATP equivalents

Last Answer : Answer : B

1 molecule of palmitic acid on total oxidation to CO2 will yield molecules of ATP (as high energy bonds): (A) 129 (B) 154 (C) 83 (D) 25

Description : 1 molecule of palmitic acid on total oxidation to CO2 will yield molecules of ATP (as high energy bonds): (A) 129 (B) 154 (C) 83 (D) 25

Last Answer : Answer : A

Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate (C) Biuret (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)

Description : Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total ... (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)

Last Answer : (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate

An increase in the NH3 /CO2 ratio in urea manufacture results in (A) Increased degree of conversion of CO2 to urea (B) Decreased degree of conversion of NH3 to urea (C) Decreased yield of urea (D) Decreased specific volume of molten mass

Description : An increase in the NH3 /CO2 ratio in urea manufacture results in (A) Increased degree of conversion of CO2 to urea (B) Decreased degree of conversion of NH3 to urea (C) Decreased yield of urea (D) Decreased specific volume of molten mass

Last Answer : (A) Increased degree of conversion of CO2 to urea

Following birds are observed in the tropical desert biome- 

Description : Following birds are observed in the tropical desert biome- 

Last Answer : Identify the incorrect factor: Following birds are observed in the tropical desert biome- (a) Vulture ... (c) Barn owls (d) Desert eagle owls

The Marine North Western type of climate is observed in- 

Description : The Marine North Western type of climate is observed in- 

Last Answer : Identify the incorrect factor: The Marine North Western type of climate is observed in- (a) Siberia (b) Canada (c) New Zealand (d) Australia

The Taiga type of climate is observed in- 

Description : The Taiga type of climate is observed in- 

Last Answer : Identify the incorrect factor: The Taiga type of climate is observed in- (a) New Zealand (b) ... (c) Northern part of North America (d) Siberia

Tropical desert or arid type climate is observed in- 

Description : Tropical desert or arid type climate is observed in- 

Last Answer : Tropical desert or arid type climate is observed in- (a) Philippines (b) Rajasthan (c) Coastal Chile (d) Peru

Equatorial rainforests are observed in- 

Description : Equatorial rainforests are observed in- 

Last Answer : Identify the incorrect factor: Equatorial rainforests are observed in- (a) Congo and Amazon basin (b) ... (c) Malaysia (d) South East Asia

Tundra climate is observed in the belt from …………………… 

Description : Tundra climate is observed in the belt from …………………… 

Last Answer : Tundra climate is observed in the belt from (a) near poles in both hemispheres ( ... both hemispheres (d) 0° to 10° in both hemispheres

Crop rotation helps to – (1) lessen use of pesticides (2) eliminate parasites which have selective hosts (3) yield more crops (4) produce a greater choice of plant products

Description : Crop rotation helps to – (1) lessen use of pesticides (2) eliminate parasites which have selective hosts (3) yield more crops (4) produce a greater choice of plant products

Last Answer : (2) eliminate parasites which have selective hosts Explanation: The growing of different kinds of crops on a piece of land in a preplanned succession is known as crop rotation. In the rotation of ... This is because weeds and pests are very choosy about the host crop plant, which they attack.

Crop rotation helps to a) lessen use of pesticides b) yield more crops c) produce a greater choice of plant products d) eliminate parasites which have selective hosts

Description : Crop rotation helps to a) lessen use of pesticides b) yield more crops c) produce a greater choice of plant products d) eliminate parasites which have selective hosts

Last Answer : d) eliminate parasites which have selective hosts

How unusual is it for peas to yield a 2nd crop in the Summer?

Description : How unusual is it for peas to yield a 2nd crop in the Summer?

Last Answer : Need Answer

Q1. Explain any one method of crop production which ensures high yield. -Science

Description : Q1. Explain any one method of crop production which ensures high yield. -Science

Last Answer : Plant breeding is one of the method adopted for high yield plant breeding and is implemented to improve the varieties of crops by breeding plants. Plants from various places/areas are picked up ... or cross-breeding is done among these diversities to get a crop/plant of anticipated characteristic.

How would you increase the yield of maize crop? (a) Evolve high yielding varieties of seeds to suit different agroclimatic regions (b) Develop high yielding varieties (c) Develop disease-resistant varieties (d) Develop early and very early maturing varieties suitable for rainfall areas

Description : How would you increase the yield of maize crop? (a) Evolve high yielding varieties of seeds to suit different agroclimatic regions (b) Develop high yielding varieties (c) Develop disease-resistant varieties (d) Develop early and very early maturing varieties suitable for rainfall areas

Last Answer : Ans: (a)

If it rains only for two months which of the following will yield maximum crop per hectare? (a) Short term crops (b) Long term crops (c) Pulses (d) Millets

Description : If it rains only for two months which of the following will yield maximum crop per hectare? (a) Short term crops (b) Long term crops (c) Pulses (d) Millets

Last Answer : Ans: (d)

The ratio of the crop yield to the total amount of water used for irrigation is called, measured in kg/ha-cm is

Description : The ratio of the crop yield to the total amount of water used for irrigation is called, measured in kg/ha-cm is

Last Answer : Ans.Water use efficiency

The quantity of water needed for normal crop growth and yield in a period of time to a place and may be supplied by precipitation or by irrigation or by both.

Description : The quantity of water needed for normal crop growth and yield in a period of time to a place and may be supplied by precipitation or by irrigation or by both.

Last Answer : Ans.Water requirement of a crop

“Relative land area under sole crop required to produce the same yield as obtained under a mixed or intercropping system at the same level of management is termed as

Description : “Relative land area under sole crop required to produce the same yield as obtained under a mixed or intercropping system at the same level of management is termed as

Last Answer : Ans.Land equivalent ratio (LER)

Forage yield of oat crop is

Description : Forage yield of oat crop is

Last Answer : Ans.400 - 450 qt/ha 24. Potato

Forage yield of berseem crop is

Description : Forage yield of berseem crop is

Last Answer : Ans.800 - 1100 qt/ha

Forage yield of berseem crop is

Description : Forage yield of berseem crop is

Last Answer : Ans.800 - 1000 qt/ha 22. Lucerne/Alfalfa

Crop rotation is being adopted – (1) to increase the productivity of the land (2) to increase the crop yield (3) to increase the soil water (4) to increase the crop resistance to pests.

Description : Crop rotation is being adopted – (1) to increase the productivity of the land (2) to increase the crop yield (3) to increase the soil water (4) to increase the crop resistance to pests.

Last Answer : (1) to increase the productivity of the land Explanation: Crop rotation is the practice of growing a series of dissimilar types of crops in the same area in sequential seasons for various ... the replenishment of nitrogen through the use of green manure in sequence with cereals and other crops.

Scientists has genetically modified photosynthesis process to increase crop yield by - (1) 11 Percent (2) 12 Percent (3) 15 Percent (4) 17 Percent

Description : Scientists has genetically modified photosynthesis process to increase crop yield by - (1) 11 Percent (2) 12 Percent (3) 15 Percent (4) 17 Percent

Last Answer : (3) 15 Percent Explanation: Photosynthesis, they convert water and carbon dioxide (CO2) to sugar and oxygen with the help of sunlight.

Which aquatic fern is used to increase the yield in paddy crop? (a) Azolla (b) Salvinia (c) Marsilea (d) Isoetes

Description : Which aquatic fern is used to increase the yield in paddy crop? (a) Azolla (b) Salvinia (c) Marsilea (d) Isoetes

Last Answer : (a) Azolla

Crop plants grown in monoculture are (a) highly prone to pests (b) low in yield (c) free from intraspecific competition (d) characterised by poor root system.

Description : Crop plants grown in monoculture are (a) highly prone to pests (b) low in yield (c) free from intraspecific competition (d) characterised by poor root system.

Last Answer : a) highly prone to pests

Which is not an adverse effect of irrigation? (a) Irrigation changes cropping pattern. (b) Water intensive crops are grown in dry areas. (c) Salinization of soil (d) Increase in crop yield.

Description : Which is not an adverse effect of irrigation? (a) Irrigation changes cropping pattern. (b) Water intensive crops are grown in dry areas. (c) Salinization of soil (d) Increase in crop yield.

Last Answer : (c) Salinization of soil

The ratio between marketable crop yield and water used in evapotranspiration is known as– 1) Field water use efficiency 2) Economic irrigation efficiency 3) Consumptive use efficiency 4) Water use efficiency

Description : The ratio between marketable crop yield and water used in evapotranspiration is known as– 1) Field water use efficiency 2) Economic irrigation efficiency 3) Consumptive use efficiency 4) Water use efficiency

Last Answer : 1) Field water use efficiency

Soybean is called a wonder crop because it is: (a) An excellent protein source (b) An excellent oilseed crop (c) High yield potential (d) Both a and b

Description : Soybean is called a wonder crop because it is: (a) An excellent protein source (b) An excellent oilseed crop (c) High yield potential (d) Both a and b

Last Answer : (d) Both a and b

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop. (a) Cytokinin (b) Gibberellin (c) Ethylene (d) Abscisic acid

Description : Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop. (a) Cytokinin (b) Gibberellin (c) Ethylene (d) Abscisic acid

Last Answer : (b) Gibberellin

Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield? (a) Application of iron and magnesium to promote synthesis of chlorophyll (b) Frequent irrigation of the crop (c) Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer (d) Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid

Description : Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum ... yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid

Last Answer : (a) Application of iron and magnesium to promote synthesis of chlorophyll

The application of plastic mulch? 1. Reduces the surface evaporation 2. Increases the yield of cabbage crop moisture 3.both of these 4. none of these

Description : The application of plastic mulch? 1. Reduces the surface evaporation 2. Increases the yield of cabbage crop moisture 3.both of these 4. none of these

Last Answer : ans 3

A curvilinear relationship between weed density and crop yield was reported by a). Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these

Description : A curvilinear relationship between weed density and crop yield was reported by a). Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these

Last Answer : b). Roberts and Bonds (1975)

The sigmoidal relationship between weed density and crop yield was proposed by a).Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these

Description : The sigmoidal relationship between weed density and crop yield was proposed by a).Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these

Last Answer : a).Zimdahl 1980

Integrated weed management practices that a). Enhance crop competitive ability b). Decrease weeds ability to reduce yield c). Practices that eliminate weeds from an area d). Both a and b e). Both a and c

Description : Integrated weed management practices that a). Enhance crop competitive ability b). Decrease weeds ability to reduce yield c). Practices that eliminate weeds from an area d). Both a and b e). Both a and c

Last Answer : d). Both a and b

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ? (1) Increasing atmospheric CO 2 concentration up to 0.05% can enhance CO 2 fixation rate (2) C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum (3) Tomato is a greenhouse crop which can be grown in CO 2 - enriched atmosphere for higher yield (4) Light saturation for CO 2 fixation occurs at 10% of full sunlight

Description : With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ? (1) Increasing atmospheric CO 2 concentration up to 0.05% can enhance CO 2 fixation ... for higher yield (4) Light saturation for CO 2 fixation occurs at 10% of full sunlight

Last Answer : (2) C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum

A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2 . It means that (A) 21% excess air has been used for combustion (B) 21% excess oxygen has been used for combustion (C) Complete combustion of fuel has taken place (D) No excess air has been used for combustion

Description : A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2 . It means that (A) 21% excess air has been used for combustion (B) 21% excess oxygen has ... (C) Complete combustion of fuel has taken place (D) No excess air has been used for combustion

Last Answer : (C) Complete combustion of fuel has taken place

Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion (B) Nitrogen percentage in the fuel is very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel

Description : Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion ... very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel

Last Answer : (C) Excess air has been used for combustion

In order to maintain an oxidising atmosphere in a furnace, it should have (A) More of excess air (B) Less of excess air (C) More of CO in flue gas (D) More of CO2 in flue gas

Description : In order to maintain an oxidising atmosphere in a furnace, it should have (A) More of excess air (B) Less of excess air (C) More of CO in flue gas (D) More of CO2 in flue gas

Last Answer : (A) More of excess air

What kind of combustion is observed in alkanes? Why do air holes of a gas burner have to be adjusted when vessel being heated gets blackened by the flame? -Science

Description : What kind of combustion is observed in alkanes? Why do air holes of a gas burner have to be adjusted when vessel being heated gets blackened by the flame? -Science

Last Answer : Alkanes are saturated hydrocarbons and generally burn in air with a blue, non-sooty flame. If the bottoms of the cooking vessels in our homes are getting blackened, it shows that the air holes of the gas stove are getting blocked and the fuel is not burning completely.

It is observed that the total pressure exerted by air on the man of average size is around 14.7 lb wt. per square inch. But the man feels quite comfortable,. It is because of-----? A. An equal and opposite pressure acts from inside (Answer) B. of the height of a man C. of gravity D. Earth pulls the man upward E. None of these

Description : It is observed that the total pressure exerted by air on the man of average size is around 14.7 lb wt. per square inch. But the man feels quite comfortable,. It is because of-----? A. An equal and ... B. of the height of a man C. of gravity D. Earth pulls the man upward E. None of these

Last Answer : A. An equal and opposite pressure acts from inside (Answer)

Before bacterial cells are simple stained and observed with the light microscope, they must be a. Smeared on a slide. b. Heat fixed. c. Air dried. d. All the above (A—C) are correct.

Description : Before bacterial cells are simple stained and observed with the light microscope, they must be a. Smeared on a slide. b. Heat fixed. c. Air dried. d. All the above (A—C) are correct.

Last Answer : d. All the above (A—C) are correct.

Which one of the following days is not observed in the month of October ? (1) Indian Air-force Day (2) U.N. Day (3) World Environment Day (4) International Day of Nonviolence

Description : Which one of the following days is not observed in the month of October ? (1) Indian Air-force Day (2) U.N. Day (3) World Environment Day (4) International Day of Nonviolence

Last Answer : World Environment Day