2. Under what conditions may adaptive radiation occur? a. when islands are colon
ID: 97644 • Letter: 2
Question
2. Under what conditions may adaptive radiation occur?
a. when islands are colonized
b. after the demise of a successful group of organisms
c. after the emergence of new physiological pathways
d. when organisms move into new adaptive zones
e. all of the above
3. Climbing plants in tropical forests have a competitive advantage over trees because
a. they grow relatively slowly.
b. they have a high amount of supporting structure.
c. they have a low amount of leaf biomass.
d. they receive a good amount of sunlight
e. they are usually parasites supported by trees.
4. Which of the following groups of organisms are decomposers?
a. animals
b. fungi
c. plants
d. algae
e. all of the above
5. Which of the following items is NOT associated with monsoons?
a. rain shadow
b. reversal of wind direction
c. adiabatic cooling
d. high precipitation
e. low air pressure
6. Which of the following is NOT true about ocean currents?
a. They move clockwise in the northern hemisphere.
b. They move counter-clockwise in the southern hemisphere.
c. They are partly caused by trade winds and westerlies.
d. They mix water thoroughly, resulting in a uniform water temperature at similar latitudes.
e. They are influenced by the Earth’s rotation.
7. Some sea slugs are able to perform photosynthesis. They do this by
a. producing their own chlorophyll.
b. eating algal cells and moving the cells to the endodermis.
c. having a mutualistic association with algae.
d. having algal chloroplasts in their endodermis.
e. all of the above.
8. The total potential energy in a system is called
a. entropy.
b. free energy.
c. enthalpy.
d. exothermic.
e. endothermic.
9. Under which condition will a reaction be spontaneous?
a. when G is positive
b. when H is negative
c. when the product(s) will have more free energy than the reactant(s)
d. when S is negative
e. none of the above
10. The binding of a substrate to an enzyme causes a change in the enzyme’s shape. This shape change is known as
a. allosteric inhibition.
b. activation.
c. reversible inhibition.
d. induced fit.
e. denaturation.
11. The part of an enzyme that interacts with its substrate(s) is called
a. an allosteric site.
b. an induced-fit.
c. a reaction site.
d. an active site.
e. a cofactor.
Explanation / Answer
2. The evolutionary diversification of a species or single ancestral lineage intovarious forms that are each adaptively specialized to a specificenvironmental niche is called as adaptive radiation. Option (e) is correct.
Adaptive radiation occurs under following condition:1) islands are colonized 2) after the demise of a successful group of organisms 3) after the emergence of new physiological pathways 4) organisms move into new adaptive zones.
3. Tropical forests account for a third of the total carbon fixed by photosynthesis.Climbers are the perfect example of the economy of nature by using maximum utilization of sunlight, water, and nutrients in minimum expanse of vegetation support.They cover a broad range of light. Climbing plants have competitive advantage over trees because they receive good amount of sunlight in tropical forests. Option (d) is correct.
4. Decompotion is the last step of the food chain. Decomposers are organisms that break down decay or dead material and keep the food chian continue. They get energy by decomposition of dead material.Fungi is primary decomposer. Other decomposer organisms are bacteria, prokaryotes,worms and slugs. Option (b) is correct.
5. High precipitation is not associated with monsoon. Rain shadow, Wind direction reversal, low air pressure are some characteristics of monsoon. Option (d) is correct.
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