Role of CFC present in atmosphere is to a) Reduction in ozone b) Ozone formation c) Formation of leg haemoglobin a) Enhance chlorophyll formation.

Role of CFC present in atmosphere is to a) Reduction in ozone b) Ozone formation c) Formation of leg haemoglobin a) Enhance chlorophyll formation.
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a) Reduction in ozone
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Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate? (A) CO (B) SO2 (C) NOx (D) CFC (chloro fluoro carbons)

Description : Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion ... rate? (A) CO (B) SO2 (C) NOx (D) CFC (chloro fluoro carbons)

Last Answer : (A) CO

How does CFC gas damage the ozone layer in the atmosphere ?

Description : How does CFC gas damage the ozone layer in the atmosphere ?

Last Answer : When CFC gas is present in the stratosphere of the atmosphere, the sun's ultraviolet rays break it down and release chlorine. This free chlorine acts as a catalyst and breaks down ozone into oxygen.

Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of (A) CO2 (B) SO2 (C) Hydrocarbons (D) CFC (chloro fluoro carbon)

Description : Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of (A) CO2 (B) SO2 (C) Hydrocarbons (D) CFC (chloro fluoro carbon)

Last Answer : (D) CFC (chloro fluoro carbon)

CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozone. (A) 10 2 (B) 10 5 (C) 10 9 (D) 10 15

Description : CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozone. (A) 10 2 (B) 10 5 (C) 10 9 (D) 10 15

Last Answer : (B) 10 5

Ozone hole causes a) Global warming b) Reduction in the rate of photosynthesis c) More UV rays come to earth d) All the above.

Description : Ozone hole causes a) Global warming b) Reduction in the rate of photosynthesis c) More UV rays come to earth d) All the above.

Last Answer : c) More UV rays come to earth

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Description : Which is not a green house gas? a) CFC b) CH4 c) CO d) H2

Last Answer : a) CFC

Major aerosol pollutant in Jet Plane emission is a) SO2 b) CO c) CH4 d) CFC.

Description : Major aerosol pollutant in Jet Plane emission is a) SO2 b) CO c) CH4 d) CFC.

Last Answer : d) CFC.

Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) (A) Acts as a green house gas thereby raising earth's temperature (B) Causes asphyxia (C) Causes increase in sea level (D) Enhances the green house effect

Description : Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) (A) Acts as a green house gas thereby raising earth's ... (B) Causes asphyxia (C) Causes increase in sea level (D) Enhances the green house effect

Last Answer : (B) Causes asphyxia

Magnesium is present in (A) Haemoglobin (B) Chlorophyll (C) Hypo solution (D) None of these

Description : Magnesium is present in (A) Haemoglobin (B) Chlorophyll (C) Hypo solution (D) None of these

Last Answer : (B) Chlorophyll

The factor influencing process of flowerings is: (a) Amount of chlorophyll (b) Soil water (c) Soil pH (d) Photoperiod

Description : The factor influencing process of flowerings is: (a) Amount of chlorophyll (b) Soil water (c) Soil pH (d) Photoperiod

Last Answer : Ans. ((d))

The empirical formula for chlorophyll-a is: (a) C35 H72 O5N4 Mg (b) C65 H70 O6N4 Mg (c) C55 H72 O5N4 Mg (d) C45 H70 O6N4 Mg

Description : The empirical formula for chlorophyll-a is: (a) C35 H72 O5N4 Mg (b) C65 H70 O6N4 Mg (c) C55 H72 O5N4 Mg (d) C45 H70 O6N4 Mg

Last Answer : Ans. ((c))

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Description : Moll’s experiment explains that (a) Carbon dioxide is essential for photosynthesis (b) Chlorophyll and water are necessary for photosynthesis (c) Light and water are essential for photosynthesis (d) All of the above are correct

Last Answer : Ans. ((a))

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Description : Carbon monoxide kills because it destroys a) Haemoglobin b) Phytochrome c) Cytochrome d) Both a and b.

Last Answer : a) Haemoglobin

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Last Answer : d) Combines with haemoglobin.

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Description : The pollutant responsible for ozone holes is - (1) CO2 (2) SO2 (3) CO (4) CFC

Last Answer : (4) CFC Explanation: Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.

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Description : Dangerous gas for depletion of ozone layer is: (A)Ethane (B) Methane (C)CFC (D) Carbon-dioxide

Last Answer : (C)CFC

This cause the depletion of ozone layer by decomposing ozone to oxygen . a) CFC b)UV radiations c)CO2 d)O2

Description : This cause the depletion of ozone layer by decomposing ozone to oxygen . a) CFC b)UV radiations c)CO2 d)O2

Last Answer : b)UV radiations

The pollutant responsible for ozone holes is _____. (1) CO2 (2) SO2 (3) CO (4) CFC

Description : The pollutant responsible for ozone holes is _____. (1) CO2 (2) SO2 (3) CO (4) CFC

Last Answer : CFC

Ozone hole is caused by a) Acetylene b) Ethylene c) Chlorofluorocarbons d) Methane.

Description : Ozone hole is caused by a) Acetylene b) Ethylene c) Chlorofluorocarbons d) Methane.

Last Answer : c) Chlorofluorocarbons

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Description : Pesticide responsible for Ozone depletion is a) BHC b) DDT c) Melathion d) None of the above.

Last Answer : d) None of the above. 

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Description : The worst enemy of ozone is a) Liquid NH3 b) SO2 c) CH4 d) CO.

Last Answer : c) CH4

Ozone day is observed on a) 25th December b) 16th September c) 21st April d) 30th January.

Description : Ozone day is observed on a) 25th December b) 16th September c) 21st April d) 30th January.

Last Answer : b) 16th September

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Description : Chief air pollutant which is likely to deplete ozone layer is a) Sulphur dioxide b) Carbon dioxide c) Carbon monoxide d) Nitrogen oxides and Fluorocarbons.

Last Answer : d) Nitrogen oxides and Fluorocarbons

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Description : Ozone layer is found in a) Thermosphere b) Stratosphere c) Mesosphere d) Lithosphere. 

Last Answer : b) Stratosphere

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Description : In 2002 AD,CFC concentration of atmosphere was

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Description : Blood is red in colour due to the presence of - (1) Cytochrome (2) Chlorophyll (3) Hemocyanin (4) Haemoglobin

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Description : The colour change in the Chameleon is due to the presence of - (1) Haemoglobin (2) Chromatophore (3) Chlorophyll (4) Pneumatophore

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Description : Mg is a component of (a) chlorophyll (b) cytochrome (c) haemoglobin (d) haemocyanin.

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Last Answer : Haemoglobin

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Last Answer : Chlorophyll

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Description : The colour change in the Chameleon is due to the presence of (1) Haemoglobin (2) Chromatophore (3) Chlorophyll (4) Pneumatophore

Last Answer : Chromatophore

Eutrophication results in reduction of a) Dissolved nitrate b) Dissolved Oxygen c) Mineral salts d) Parasitic protozoa.

Description : Eutrophication results in reduction of a) Dissolved nitrate b) Dissolved Oxygen c) Mineral salts d) Parasitic protozoa. 

Last Answer : b) Dissolved Oxygen

(1) the action of ultraviolet rays on oxygen Explanation: The majority of tropospheric ozone formation occurs when nitrogen oxides (NOx), carbon monoxide (CO ) and volatile organic compounds (VOCs), such as xylene, react in the atmosphere in the presence of sunlight containing ultra violet rays. NOx, CO, and VOCs are called ozone precursors. CO + 2O2 + CO2 + O3

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Last Answer : Water is not effective in extinguishing a fire caused by petrol because - (1) the flame is too hot for water to cool it down (2) water and petrol react chemically (3) water and petrol are ... (4) water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn

Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere? (1) Benzopyrene (2) Hydrocarbons (3) Chlorofluorocarbons (4) UV radiation

Description : Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere? (1) Benzopyrene (2) Hydrocarbons (3) Chlorofluorocarbons (4) UV radiation

Last Answer : (3) Chlorofluorocarbons Explanation: Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozonedepleting substances.

Agrochemicals are the most dangerous toxins as they circulate in a. Food chains b.Water bodies c. Environment d. Atmosphere

Description : Agrochemicals are the most dangerous toxins as they circulate in a. Food chains b.Water bodies c. Environment d. Atmosphere

Last Answer : a. Food chains

Which gas of the atmosphere holds up ultraviolet rays ? a) O2 b) O2 c) N2 d) CO2.

Description : Which gas of the atmosphere holds up ultraviolet rays ? a) O2 b) O2 c) N2 d) CO2.

Last Answer : b) O2

Consider the following statement: (1) In plant cells, cytokinesis start with the formation of the phragmoplast (2) Phragmoplast comprises intrazonal microtubules and Golgi vesicles (3) Primary cell wall is produced by microtubules (4) Phragmoplast is formed by nucleus

Description : Consider the following statement: (1) In plant cells, cytokinesis start with the formation of the phragmoplast (2) Phragmoplast comprises intrazonal microtubules and Golgi vesicles (3) Primary cell wall is produced by microtubules (4) Phragmoplast is formed by nucleus

Last Answer : Ans. ((a))

The formation of multivalents at meiosis in diploid organism is due to: (a) Monosomy (b) Delection (c) Inversion (d) Reciprocal translocation

Description : The formation of multivalents at meiosis in diploid organism is due to: (a) Monosomy (b) Delection (c) Inversion (d) Reciprocal translocation

Last Answer : Ans. ((d))

Colchicines prevent the spindle formation during: (a) Prophase (b) Metaphase (c) Anaphase (d) Telophase

Description : Colchicines prevent the spindle formation during: (a) Prophase (b) Metaphase (c) Anaphase (d) Telophase

Last Answer : Ans. ((b))

In angiosperm, triple fusion is necessary for the formation of: (a) Embryo (b) Pollen (c) Endosperm (d) Leaf

Description : In angiosperm, triple fusion is necessary for the formation of: (a) Embryo (b) Pollen (c) Endosperm (d) Leaf

Last Answer : Ans. ((c))

Pyrenoids are the centers for formation of: (a) Proteins (b) enzymes (c) Fat (d) Starch

Description : Pyrenoids are the centers for formation of: (a) Proteins (b) enzymes (c) Fat (d) Starch

Last Answer : Ans. ((d))

Formation of diploid embryosac from diploid vegetative structure, e.g., nucellus or integument etc., without meiosis is called: (a) Apospory (b) Apomixis (c) Diplospory (d) Adventives polyembryony

Description : Formation of diploid embryosac from diploid vegetative structure, e.g., nucellus or integument etc., without meiosis is called: (a) Apospory (b) Apomixis (c) Diplospory (d) Adventives polyembryony

Last Answer : Ans. ((a))

Formation of 8-nucleate embryosac by pollen grains is also called as

Description : Formation of 8-nucleate embryosac by pollen grains is also called as

Last Answer : Formation of 8-nucleate embryosac by pollen grains is also called as – Nemec phenomenon 

Mycorrhizae is associated with the following a) Formation of root nodules b) Hyphae penetrating the soil c) Found mostly in lower plants d) Soil erosion

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Last Answer : a) Formation of root nodules

What is the role of auxin in plants ?

Description : What is the role of auxin in plants ?

Last Answer : The role of auxin in plants is as follows : Prevents premature fall of fruit. Helps to produce seedless fruit. Auxin is also used for seed germination and weed control.

What are bundle sheath extensions? What is their role?

Description : What are bundle sheath extensions? What is their role? 

Last Answer : Ans: The extensions of bundle sheath of leaf towards adaxial and abaxial sides of leaf are called as bundle sheath extensions. They help in conduction and providing mechanical strength. 

What are bulliform cells? What is their role?

Description : What are bulliform cells? What is their role?

Last Answer : Ans: Specialised larger epidermal cells seen in the upper epidermis of grass leaves which store water are called as bulliform cells or motor cells. They help in rolling and unrolling of lamina. 

What is the role of golgi complex in cell division?

Description : What is the role of golgi complex in cell division?

Last Answer : Ans: During cell division the vesicles of Golgi are involved in the formation of cell plate at the equatorial region which eventually forms the middle lamellum. In this way Golgi plays a role in cytokinesis. 

In which stage of cell does crossing over occur? What is its role in the origin of species?

Description : In which stage of cell does crossing over occur? What is its role in the origin of species? 

Last Answer : Ans: Pachytene of Meiosis. It brings about variations in the off spring. Continuation of these variations for several generations leads to origin of new species.