What organisms about half of the oxygen on earth?

What organisms about half of the oxygen on earth?
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trees
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The first photosynthetic oxygen liberating organisms to appear on earth were (1) Cyanobacteria (2) Bryophytes (3) Green algae (4) Bacteria

Description : The first photosynthetic oxygen liberating organisms to appear on earth were (1) Cyanobacteria (2) Bryophytes (3) Green algae (4) Bacteria

Last Answer : (1) Cyanobacteria Explanation: Cyanobacteria or blue green algae were the photosynthetic organisms that lived in the ancient ocean. It liberated the oxygen found in the iron oxide.

Following are the two statements regarding the origin of life. (A) The earliest organisms that appeared on the earth were non-green and presumably anaerobes. (B) The first autotrophic organisms were the chemoautotrophs that never released oxygen. Of the above statements which one of the following options is correct? (a) Both (A) and (B) are correct. (b) Both (A) and (B) are false. (c) (A) is correct but (B) is false. (d) (B) is correct but (A) is false.

Description : Following are the two statements regarding the origin of life. (A) The earliest organisms that appeared on the earth were non-green and presumably anaerobes. (B) The first autotrophic organisms were the chemoautotrophs that ... ) is correct but (B) is false. (d) (B) is correct but (A) is false.

Last Answer : (a) Both (A) and (B) are correct.

What would happen to the amount of oxygen in Earth and atmosphere if half the trees on Earth were cut down Why?

Description : What would happen to the amount of oxygen in Earth and atmosphere if half the trees on Earth were cut down Why?

Last Answer : Need answer

How much time would it take to grow enough plants on Mars so that it would create enough oxygen for animals, organisms and humans breath without the aid of an enclosed ecosystem?

Description : How much time would it take to grow enough plants on Mars so that it would create enough oxygen for animals, organisms and humans breath without the aid of an enclosed ecosystem?

Last Answer : The bigger problem is the lack of water on Mars. Hard to grow plants with no water. Yes, there’s some water on Mars, but not anywhere near enough to grow and sustain sufficient plant life.

Deforestation kills many organisms that produce oxygen. What oxygen-producing organisms would remain if all the forests were destroyed?

Description : Deforestation kills many organisms that produce oxygen. What oxygen-producing organisms would remain if all the forests were destroyed?

Last Answer : plankton

Which one of the following categories of organisms do not evolve oxygen during Photosynthesis

Description : Which one of the following categories of organisms do not evolve oxygen during Photosynthesis

Last Answer : Which one of the following categories of organisms do not evolve oxygen during Photosynthesis A. Red ... plants with Kranz anatomy D. Blue green algae

Which one of the following categories of organisms do not evolve oxygen during Photosynthesis

Description : Which one of the following categories of organisms do not evolve oxygen during Photosynthesis

Last Answer : Which one of the following categories of organisms do not evolve oxygen during ... Photosynthetic green algae D. Photosynthetic bacteria

All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen. This breakdown of glucose to pyruvic acid

Description : All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen. This breakdown of glucose to pyruvic acid

Last Answer : All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen ... of glucose to pyruvic acid is called.

All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen. This breakdown of glucose to pyruvic acid

Description : All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen. This breakdown of glucose to pyruvic acid

Last Answer : All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen ... of glucose to pyruvic acid is called.

What Organisms do not need oxygen to survive?

Description : What Organisms do not need oxygen to survive?

Last Answer : Anaerobic organisms do not need oxygen to survive. Some are even poisoned by oxygen. There are three types of anaerobes; obligate, faculatative, and aerotolerantanaerobes. Obligate anaerobes cannot survive ... the bacterium Lactobacillus, which lives in the human gut and is used to produce yogurt.

When oxygen- breathing organisms first thrived?

Description : When oxygen- breathing organisms first thrived?

Last Answer : The Paleozoic era was the era when oxygen-breathing organisms first thrived.

The organisms which can grow best in the presence of a low concentration of oxygen a. Aerophilic b. Microaerophilic c. Aerobic d. Anaerobic

Description : The organisms which can grow best in the presence of a low concentration of oxygen a. Aerophilic b. Microaerophilic c. Aerobic d. Anaerobic

Last Answer : Ans: B

The organisms which can grow both in presence and absence of oxygen a. Aerobes b. Anaerobes c. Faculative anaerobes d. Strict aerobes

Description : The organisms which can grow both in presence and absence of oxygen a. Aerobes b. Anaerobes c. Faculative anaerobes d. Strict aerobes

Last Answer : Ans: A

The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is - (1) 4 - 6 (2) 2 - 4 (3) 8 - 10 (4) 12 - 16

Description : The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is - (1) 4 - 6 (2) 2 - 4 (3) 8 - 10 (4) 12 - 16

Last Answer : (1) 4 - 6 Explanation: Oxygen is one of several dissolved gases important to aquatic systems. Dissolved oxygen is necessary to maintain aerobic conditions in surface waters and is ... approach saturation - that concentration which is in equilibrium with the partial pressure of atmospheric oxygen.

(2) amount of oxygen used for biochemical oxidation Explanation: Biochemical oxygen demand or B.O.D. is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. The term also refers to a chemical procedure for determining this amount. This is not a precise quantitative test, although it is widely used as an indication of the organic quality of water.

Description : (2) amount of oxygen used for biochemical oxidation Explanation: Biochemical oxygen demand or B.O.D. is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to ... quantitative test, although it is widely used as an indication of the organic quality of water.

Last Answer : The addition of gypsum to port-land cement helps in : (1) increasing the strength of cement (2) rapid setting of cement (3) preventing rapid setting of cement (4) reduction in the cost of cement

In Living organisms During respiration which of the following Products are not formed if oxygen is not available? (a) Carbon dioxide + Water (b) Carbon dioxide + Alcohol (c) Lactic acid + Alcohol (d) Carbon dioxide + Lactic Acid

Description : In Living organisms During respiration which of the following Products are not formed if oxygen is not available? (a) Carbon dioxide + Water (b) Carbon dioxide + Alcohol (c) Lactic acid + Alcohol (d) Carbon dioxide + Lactic Acid

Last Answer : Answer: (b) Carbon dioxide + Alcohol

A river with an inflow of domestic sewage rich in organic waste may result in (a) an increased production of fish due to biodegradable nutrients (b) death of fish due to lack of oxygen (c) drying of the river very soon due to algal bloom (d) increased population of aquatic food web organisms.

Description : A river with an inflow of domestic sewage rich in  organic waste may result in  (a) an increased production of fish due to  biodegradable nutrients (b) death of fish due to lack of oxygen ( ... of the river very soon due to algal bloom (d) increased population of aquatic food web  organisms.

Last Answer : (d) increased population of aquatic food web  organisms.

A lake which is rich in organic waste may result in (a) increased population of aquatic organisms due to minerals (b) drying of the lake due to algal bloom (c) increased population of fish due to lots of nutrients (d) mortality of fish due to lack of oxygen.

Description : A lake which is rich in organic waste may result in (a) increased population of aquatic organisms due  to minerals (b) drying of the lake due to algal bloom (c) increased population of fish due to lots of  nutrients (d) mortality of fish due to lack of oxygen.

Last Answer : (d) mortality of fish due to lack of oxygen.

A river with an inflow of domestic sewage rich in organic waste may result in (a) an increased production of fish due to biodegradable nutrients (b) death of fish due to lack of oxygen (c) drying of the river very soon due to algal bloom (d) increased population of aquatic food web organisms.

Description : A river with an inflow of domestic sewage rich in organic waste may result in (a) an increased production of fish due to biodegradable nutrients (b) death of fish due to lack of oxygen (c) drying of the river very soon due to algal bloom (d) increased population of aquatic food web organisms.

Last Answer : (b) death of fish due to lack of oxygen

A lake which is rich in organic waste may result in (a) increased population of aquatic organisms due to minerals (b) drying of the lake due to algal bloom (c) increased population of fish due to lots of nutrients (d) mortality of fish due to lack of oxygen.

Description : A lake which is rich in organic waste may result in (a) increased population of aquatic organisms due to minerals (b) drying of the lake due to algal bloom (c) increased population of fish due to lots of nutrients (d) mortality of fish due to lack of oxygen.

Last Answer : (d) mortality of fish due to lack of oxygen.

Lagoons used for purification of polluted water (A) Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds (B) Use micro-organisms/bacteria in presence of dissolved oxygen (C) Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre (D) All (A), (B) & (C)

Description : Lagoons used for purification of polluted water (A) Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds (B) Use micro-organisms/bacteria in presence of dissolved oxygen (C) Gives an ... 1 mg/litre and BOD = 3.8 mg/litre (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Organisms that practice heterotrophy are able to synthesize their own food from _____. a. light b. simple carbon sources c. carbon monoxide d. oxygen gas

Description : Organisms that practice heterotrophy are able to synthesize their own food from _____. a. light b. simple carbon sources c. carbon monoxide d. oxygen gas

Last Answer : b. simple carbon sources

This early atmosphere was rich in CO2 and H2O. How did oxygen enter our atmosphere? (a) Meteorites. (b) From organisms that evolved to convert CO2 and H20 into sugars (energy), resulting in the waste product oxygen. (c) Volcanic emissions. (d) Methanogenic bacteria.

Description : This early atmosphere was rich in CO2 and H2O. How did oxygen enter our atmosphere? (a) Meteorites. (b) From organisms that evolved to convert CO2 and H20 into sugars (energy), resulting in the waste product oxygen. (c) Volcanic emissions. (d) Methanogenic bacteria.

Last Answer : (b) From organisms that evolved to convert CO2 and H20 into sugars (energy), resulting in the waste product oxygen.

Metronidazole is selectively active against anaerobic organisms because: A. Aerobes have an active transport mechanism to pump it out of their cell B. Only anaerobes reduce it to generate the reactive nitro radical C. It is rapidly inactivated in the presence of oxygen D. It binds to DNA of anaerobes with high affinity

Description : Metronidazole is selectively active against anaerobic organisms because: A. Aerobes have an active transport mechanism to pump it out of their cell B. Only anaerobes reduce it to generate the reactive ... inactivated in the presence of oxygen D. It binds to DNA of anaerobes with high affinity

Last Answer : B. Only anaerobes reduce it to generate the reactive nitro radical

The oxygen in the earth's atmosphere was probably produced by which of the following? w) volcanos x) photosynthetic organisms y) radioactive minerals z) meteors

Description : The oxygen in the earth's atmosphere was probably produced by which of the following? w) volcanos x) photosynthetic organisms y) radioactive minerals z) meteors

Last Answer : ANSWER: X -- PHOTOSYNTHETIC ORGANISMS

The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is : (1) 4 – 6 (2) 2 – 4 (3) 8 – 10 (4) 12 – 16

Description : The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is : (1) 4 – 6 (2) 2 – 4 (3) 8 – 10 (4) 12 – 16

Last Answer :  4 – 6

The distinctive features of azithromycin include the following except: A. Efficacy against organisms which have developed resistance to erythromycin B. Marked tissue distribution and intracellular penetration C. Long terminal elimination half-life D. Low propensity to drug interactions due to inhibition of cytochrome P450 enzymes

Description : The distinctive features of azithromycin include the following except: A. Efficacy against organisms which have developed resistance to erythromycin B. Marked tissue distribution and intracellular penetration ... D. Low propensity to drug interactions due to inhibition of cytochrome P450 enzymes

Last Answer : A. Efficacy against organisms which have developed resistance to erythromycin

Can you believe that there are living organisms on the Earth that are over 5,000 years old?

Description : Can you believe that there are living organisms on the Earth that are over 5,000 years old?

Last Answer : answer:First, I do. It's life anyway, anything can happen. And as long as the age of an organism is within the Earth's age, the organism can stand a chance of living so long. Moreover, it' ... of living for a very long time (one tree actually outlives a turtle). Second, where is the source?

the most diverse and prevalent organisms on earth are -General Knowledge

Description : the most diverse and prevalent organisms on earth are -General Knowledge

Last Answer : This answer was deleted by our moderators...

The first organisms to appear on Earth were chemoheterotrophs or chemoautotrophs ? -Biology

Description : The first organisms to appear on Earth were chemoheterotrophs or chemoautotrophs ? -Biology

Last Answer : answer:

What do all organisms on earth have that are made of DNA?

Description : What do all organisms on earth have that are made of DNA?

Last Answer : no they all are not made of only DNA some of them are made by RNA its only happens in 1% of organism

Dead reamins of organisms found in the earth crust are the:

Description : Dead reamins of organisms found in the earth crust are the:

Last Answer : Dead reamins of organisms found in the earth crust are the: A. Palaentological evidences ... C. Antamocial evidences D. Physicological evidences

Following are the two statements regarding the origin of life : A.`" "` The earliest organisms that appeared on the earth were non-green and presumabl

Description : Following are the two statements regarding the origin of life : A.`" "` The earliest organisms that appeared on the earth were non-green and presumabl

Last Answer : Following are the two statements regarding the origin of life : A.`" "` The earliest organisms that appeared on ... D. Both (a) and (b) are false.

First organisms to evolve on the earth were :

Description : First organisms to evolve on the earth were :

Last Answer : First organisms to evolve on the earth were : A. saprotrophs B. autotrophs C. heterotroph D. Plants

Number of known species of organisms on this earth is

Description : Number of known species of organisms on this earth is

Last Answer : Number of known species of organisms on this earth is A. 5.0 million B. 3.2 million C. 1.7 million D. 1.32 million

$ Life on earth originated by interaction of the various chemical substances in the broth of the sea. ! The first organisms were, pherhaps the chemoau

Description : $ Life on earth originated by interaction of the various chemical substances in the broth of the sea. ! The first organisms were, pherhaps the chemoau

Last Answer : $ Life on earth originated by interaction of the various chemical substances in the broth of the sea. ! The ... wrong D. If both As and R are wrong.

Are reservoirs that chemical elements can move through as part of the Earth's biogeochemical cycle I.the solid Earth II.Earth's oceans III.Earth's atmosphere IV.organisms on Earth?

Description : Are reservoirs that chemical elements can move through as part of the Earth's biogeochemical cycle I.the solid Earth II.Earth's oceans III.Earth's atmosphere IV.organisms on Earth?

Last Answer : Need answer

In what way are are living organisms on earth similar?

Description : In what way are are living organisms on earth similar?

Last Answer : They are all assembled from a nucleic acid code

What Multi cell living organisms have lived on earth for how many years?

Description : What Multi cell living organisms have lived on earth for how many years?

Last Answer : What is the answer ?

What is the most likely consequence if a group of living organisms is unable to adapt to changing conditions within the Earth system?

Description : What is the most likely consequence if a group of living organisms is unable to adapt to changing conditions within the Earth system?

Last Answer : Need answer

What is the evidence that the first life on earth was simple, single-celled organisms?

Description : What is the evidence that the first life on earth was simple, single-celled organisms?

Last Answer : microfossils

Biosphere refers to – (1) the area of the land inhabited by living organism (2) the part of ocean inhabited by plants and animals (3) the portion of the earth, including the oceans, the land, the soil and the atmosphere inhabited by living organisms (4) the atmosphere surrounding the living organisms

Description : Biosphere refers to - (1) the area of the land inhabited by living organism (2) the part of ocean inhabited by plants and animals (3) the portion of the earth, including the oceans ... land, the soil and the atmosphere inhabited by living organisms (4) the atmosphere surrounding the living organisms

Last Answer : (3) the portion of the earth, including the oceans, the land, the soil and the atmosphere inhabited by living organisms Explanation: The biosphere is the global ecological system integrating all living beings ... up of the parts of Earth where life exists. It is the worldwide sum of all ecosystems.

The food chain refers to the transfer of energy from : (1) the interior of the earth to the surface (2) lower to higher latitudes (3) one organism to another (4) organisms of the land to those of the sea by means of river

Description : The food chain refers to the transfer of energy from : (1) the interior of the earth to the surface (2) lower to higher latitudes (3) one organism to another (4) organisms of the land to those of the sea by means of river

Last Answer : (3) one organism to another Explanation: A food chain is a linear sequence of links in a food web starting from atrophic species that eats no other species in the web and ends at a ... linear monophagous pathways. A common metric used to quantify food web trophic structure is food chain length.

Exobiology deals with the study of - (1) external characters of living organisms (2) life on the surface of the earth (3) life in the outer layers of atmosphere (4) life in other planets and space

Description : Exobiology deals with the study of - (1) external characters of living organisms (2) life on the surface of the earth (3) life in the outer layers of atmosphere (4) life in other planets and space

Last Answer : (4) life in other planets and space Explanation: Exobiology is the branch of science that deals with the possibility and likely nature of life on other planets or in space. The primary ... processes leading to the origin evolution and distribution of life on Earth or elsewhere in the universe.

The organisms responsible for the characteristic musty or earth odor of a freshly plowed fieldis/are A.Nocardia B.Streptomyces C.Micromonospora D.all of these

Description : The organisms responsible for the characteristic musty or earth odor of a freshly plowed fieldis/are A.Nocardia B.Streptomyces C.Micromonospora D.all of these

Last Answer : D.all of these

“There are more living organisms in a teaspoonful of soil than there are people alive on Earth.”

Description : “There are more living organisms in a teaspoonful of soil than there are people alive on Earth.”

Last Answer : Soil is alive! Much more than a prop to hold up plants, healthy soil is a jungle of creatures eating, digesting, and reproducing their way toward soil fertility – without them, our food and plant life would not grow.

“There are more living organisms on the skin of each human than there are humans on the surface of the earth.”

Description : “There are more living organisms on the skin of each human than there are humans on the surface of the earth.” 

Last Answer : It's estimated that there are 50 million bacteria per cm2 of average human skin, which equates to 100 billion for the average human body. Then there are all the other microorganisms, such as ... the human skin. Usually these creatures will do no harm, they will just be microscopically ever-present.

Exobiology deals with the study of : (1) external characters of living organisms (2) life on the surface of the earth (3) life in the outer layers of atmosphere (4) life in other planets and space

Description : Exobiology deals with the study of : (1) external characters of living organisms (2) life on the surface of the earth (3) life in the outer layers of atmosphere (4) life in other planets and space

Last Answer : life in other planets and space

Biosphere refers to (1) the area of the land inhabited by living organism (2) the part of ocean inhabited by plants and animals (3) the portion of the earth, including the oceans, the land, the soil and the atmosphere inhabited by living organisms (4) the atmosphere surrounding the living organisms

Description : Biosphere refers to (1) the area of the land inhabited by living organism (2) the part of ocean inhabited by plants and animals (3) the portion of the earth, including the oceans, the land, the soil and the atmosphere inhabited by living organisms (4) the atmosphere surrounding the living organisms

Last Answer : the portion of the earth, including the oceans, the land, the soil and the atmosphere inhabited by living organisms

The food chain refers to the transfer of energy from : (1) the interior of the earth to the surface (2) lower to higher latitudes (3) one organism to another (4) organisms of the land to those of the sea by means of river

Description : The food chain refers to the transfer of energy from : (1) the interior of the earth to the surface (2) lower to higher latitudes (3) one organism to another (4) organisms of the land to those of the sea by means of river

Last Answer : one organism to another