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Consider the following statements of Odum regarding the conditions that maintain biological energy flow in estuaries and choose the correct answer:
1. Tidal action that maintains a rapid removal of waste products of metabolism
2. A variety of plant species and life-forms that provide a continuous photosynthetic process
3. An estuary often functions as a nutrient trap
4. Close contact between autotrophic and heterotrophic layers

Consider the following statements of Odum regarding the conditions that maintain biological energy flow in estuaries and choose the correct answer:
1. Tidal action that maintains a rapid removal of waste products of metabolism
2. A variety of plant species and life-forms that provide a continuous photosynthetic process
3. An estuary often functions as a nutrient trap
4. Close contact between autotrophic and heterotrophic layers Correct Answer 1, 2, 3 and 4 are true

Related Questions

Consider the following statements and choose the correct answer:
1. The waters of estuaries are among most naturally fertile in the world
2. The high productivity in estuaries is brought about by the action of tides, which promote a rapid circulation of nutrients and aid in the removal of waste products
3. "Mariculture" is done in the oyster farms of Japan where oysters are grown suspended on rafts hanging from floats
4. Estuaries and marshes are among the ecologic regions of the world that are most seriously threatened by human activities
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: Many nations have laws that protect conservation-reliant species which, for example, forbid hunting, restrict land development, or create protected areas. B: The International Union for Conservation of Nature (IUCN) Red List lists the global conservation status of many species, and various other agencies assess the status of species within particular areas.  C: Endangered species may be at risk due to factors such as habitat loss, poaching, and invasive species. D: An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction.
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
Modern civilization is completely dependent on energy, which has therefore to be abundant and also economical. About 85% of the world's energy is supplied by oil, coal and natural gas while nuclear, hydro, wind and solar power and biomass supply the rest. Coal, nuclear and hydro are used primarily to generate electricity while natural gas is widely used for heating. Biomass is used both for heating and cooking. The wind and solar power is the future's hope as they are sustainable energy sources. Oil powers almost all machines that move and that makes oil uniquely versatile. Oil powered airplanes carry 500 people across the widest oceans at nearly the speed of sound. Oil powered machines produce and transport food. Oil powered machines are ubiquitous. Clearly, we live in the age of oil but it is drawing to a close. According to data available if oil production remains constant until it's gone, there is enough to last 42 years. Oil wells will produce less as they become depleted, which will make it impossible to keep production constant. Similarly natural gas and coal will last another 61 years and 133 years respectively. Naturally, as they become scarce, they become expensive, leading to a worldwide energy crisis. If we are to survive on this planet, we have to make a transition to sustainable energy sources. The transition may be willy-nilly or planned - the choice is ours. The dawning era of limited and expensive energy will be very difficult for everyone on earth but will be even more difficult if it is not anticipated. It is of utmost importance that the public and policymakers understand the global energy crisis and act in tandem to ensure that the species 'homo sapiens' does not become extinct. Biomass is an energy source used in
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
Modern civilisation is completely dependent on energy, which has therefore to be abundant and also economical. About 85% of the world's energy is supplied by oil, coal and natural gas while nuclear, hydro, wind and solar power and biomass supply the rest. Coal, nuclear and hydro are used primarily to generate electricity while natural gas is widely used for heating. Biomass is used both for heating and cooking. The wind and solar power is the future's hope as they are sustainable energy sources. Oil powers almost all machines that move and that makes oil uniquely versatile. Oil powered airplanes carry 500 people across the widest oceans at nearly the speed of sound. Oil powered machines produce and transport food. Oil powered machines are ubiquitous. Clearly, we live in the age of oil but it is drawing to a close. According to data available if oil production remains constant until it's gone, there is enough to last 42 years. Oil wells will produce less as they become depleted, which will make it impossible to keep production constant. Similarly natural gas and coal will last another 61 years and 133 years respectively. Naturally, as they become scarce, they become expensive, leading to a worldwide energy crisis. If we are to survive on this planet, we have to make a transition to sustainable energy sources. The transition may be willy-nilly or planned - the choice is ours. The dawning era of limited and expensive energy will be very difficult for everyone on earth but will be even more difficult if it is not anticipated. It is of utmost importance that the public and policymakers understand the global energy crisis and act in tandem to ensure that the species 'homo sapiens' does not become extinct. The energy sources of the future are
Which of the following statements is/are CORRECT regarding the flow of fluid? a) All fluid layers are parallel to each other in case of turbulent flow. b) The Reynold’s number is less than 2000 for turbulent flow and greater than 4000 for laminar flow. c) Two fluid layers don’t cross each other in case of laminar flow
Consider the following statements regarding Xenia and choose the correct answer:
1. If a white variety (yy) is pollinated with pollen from a yellow variety (YY), one of the male gametes (Y) will unite with the egg (y) to produce a hybrid embryo (Yy) which will act as a heterozygote for yellow endosperm in the next generation
2. The second male gamete (Y) will unite with the two polar nuclei (y, y) and produces the primary endosperm nucleus (Yyy) which is triploid
3. If a yellow endosperm variety (YY) is crossed with pollen from a white grained variety, the grains produced are white like the pollen parent
Consider the following statements regarding ecology: 1. Climax ecosystem is a stage in the evolution of an ecosystem, at which all the species are in dynamic equilibrium among themselves as also with the environment. 2. Ecological niche means all the physical, chemical and biological factors that a species needs in order to live and reproduce exist. 3. Edge effect refers to the presence of rich and unique biological diversity found in an ecotone. Which of the above statements are correct?
Consider the following statements: In case of helical gears, teeth are cut at an angle to the axis of rotation of the gears. 1) Helix angle introduces another ratio called axial contact ratio. 2) Transverse contact ratio is equal to axial contact ratio in helical gears. 3) Large transverse contact ratio does not allow multiple teeth to share the load. 4) Large axial contact ratio will cause larger axial force component Which of the above statements are correct?
Consider the following statements about an estuary: 1. An estuary is the place where the river freshwater meets with ocean water. 2. This area is highly productive. 3. This area is highly unproductive. Which of the above statements is/are true?
Mark the incorrect statement regarding Autotrophic nutrition. 1. Carbon and energy requirements of the autotrophic organism are fulfilled by photosynthesis 2. It is process by which autotrophs take in substances from the outside and convert them into stored forms of energy. 3. Substances are taken in the form of carbon dioxide and methane which is converted into fats in the presence of sunlight and chlorophyll.