Living Environment Regents Review Practice Ecology Question 11
Wednesday, 24 June 2009 12:12
Compared to a forest ecosystem a tea garden lacks:
Correct Answer: Option C – Biodiversity
A forest ecosystem supports variation in life forms ensuring coexistence of a variety of populations of organisms. However a Tea Garden has limitations in terms of the producers being the Tea plants thus limiting the other organisms in the food web and limiting biodiversity.
Variation in the number of autotrophs and heterotrophs, supported by a forest ecosystem is termed as biodiversity.
Energy flow is decided by the food webs existent in the ecosystems.
Living Environment Regents Review Practice Ecology Question 12
Wednesday, 24 June 2009 12:13
A food pyramid representing relationships in a pond community is shown below
The light energy from Sun is made available to the pond community through the activities of the organisms at which level?
Correct Answer: Option A – A – Algae
Algae use the sunlight water and other minerals to produce their own food. Water fleas feed on algae. Minnows feed on Water Fleas and Bass feed on Minnows. Hence, algae become the source of accumulating converting and transferring the light energy from the sun through the pond community.
Hence, Option A is the correct answer and options B, C and D are incorrect
Living Environment Regents Review Practice Ecology Question 13
Wednesday, 24 June 2009 12:18
From the factors listed below which activity is not considered by ecologists during the evaluation of the impact of human activities on an ecosystem?
A)Light energy released from sun
B)Quality of atmosphere
C)Degree of Biodiversity
D)Location of power plants
Correct Answer: Option – A – Light energy released from the sun
When ecologists have to evaluate the impact of human activities on an ecosystem they take into consideration the quality of the atmosphere, degree of biodiversity and also the location of power plants to get accurate measures of the imbalance in the ecosystem, since these can be affected by human activities. However the light energy from sun being considered uncontrollable by human activity is not considered as a measure of evaluating the impact of human activities on the ecosystem.
Hence, Option A is the correct answer and options B, C and D are incorrect.
Living Environment Regents Review Practice Ecology Question 14
Wednesday, 24 June 2009 12:19
Eating an apple provides energy for human metabolic processes. What is the original source of this energy?
A)Protein molecules stored in the apple
B)Energy made available by photosynthesis
C)Starch molecules absorbed by Apple tree
D)Minerals found in the soil
Correct Answer: - Option B - Energy made available by photosynthesis
The process of photosynthesis in plants is the source of all the energy stored in plants in the form of leafs and fruits. Hence, apple being a fruit provides energy for the human metabolic processes as a result of the activity of photosynthesis in the Apple tree. Hence, Option B is the correct answer.
Apple does not store protein molecules directly usable for human metabolic processes.
Apple tree does not directly absorb starch molecules.
Minerals found in soil cannot be directly used by human metabolic processes.
Living Environment Regents Review Practice Ecology Question 15
Wednesday, 24 June 2009 12:21
Once oceanic water recedes rocky islands are formed. Which form of vegetation probably appears on such a rocky surface?
Correct Answer: Option D – Lichens
Lichen is an example of a pioneer organism, one of the first organisms to inhabit an area. Succession on land usually starts with lichens on bare rock, which will build up soil, allowing weeds to grow. The weeds soon get crowded out by the shrubs, which then get overpowered by the trees.
Hence, Option D is the correct answer and the options A, B and C are incorrect.
Living Environment Regents Review Practice Ecology Question 16
Wednesday, 24 June 2009 12:22
Decay/ Decomposition of organic matter is accomplished by the activity of:
A)Viruses and algae
B)Bacteria and Fungi
Correct Answer: Option B – Bacteria and Fungi
Bacteria and fungi feed on dead organic matter and help them decompose releasing the elements like nitrogen, carbon, etc. back to the environment, which in turn are absorbed by autotrophs and the whole cycle of flow of minerals through the food web follows. Hence, Option B is the correct answer.
Algae are autotrophs which generate food and viruses carry diseases.
Green plants are producers of food and not decomposers.
Scavengers feed on dead bodies but do not decompose them.
Living Environment Regents Review Practice Ecology Question 18
Wednesday, 24 June 2009 12:27
What is the most likely occurrence after a natural disaster such as fire or earth quake?
A)The area will remain uninhabited for an indefinite time period
B)A stable ecosystem will be reestablished after A year
C)An ecosystem similar to the original one will eventually be reestablished if the climate is stable
D)An ecosystem of only micro-organisms will come into existence
Correct Answer: Option C - An ecosystem similar to the original one will eventually be reestablished if the climate is stable
After a natural disaster occurs a temporary imbalance in the ecosystem occurs. But, once the stability of the abiotic factors such as climate soil, etc occurs, a similar ecosystem will be reestablished. Hence, Option C is the correct answer.
Until there is availability of basic necessities for continuity of life such as oxygen, water, soil, etc, organisms will grow and the ecosystem will not remain uninhabited.
A time frame of A year is not certain for the reestablishment of a stable ecosystem after a natural disaster.
An ecosystem may be pioneered by microorganisms but, evolution will bring in larger organisms also in the cycle of the ecosystem eventually.
Living Environment Regents Review Practice Ecology Question 20
Wednesday, 24 June 2009 12:29
One reason for the stability of an ecosystem is:
A)Majority of predators than prey
B)High level of biodiversity
C)Decreasing biotic factors
D)Decreasing finite resources
Correct Answer: Option B – High level of biodiversity
Biodiversity ensures variety in the types of organisms at various levels of the food web. This helps in maintaining a balanced feeding chain and flow of energy. Hence, a stable ecosystem is an outcome of a high biodiversity.
More predators than prey, decreasing biotic factors and decreasing finite resources lead to an imbalance in the ecosystem. Hence, options A, C and D are incorrect.
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