What are the types of symbiotic relationships that organisms exhibit? Give examples of each. What will be an ideal response?
ANS:Answer
should include:
? Symbiotic relationships are the co-occurrence of two species. Their lives are closely
interwoven.
? Mutualism is a form of symbiosis that occurs when both organisms benefit in some way
from the relationship. This type of relationship is rare among marine organisms.
? Commensalism benefits the symbiont, but the host is neither helped nor harmed.
? Parasitism is when a symbiont uses a host for at least part of its life cycle to obtain food.
This is the most common relationship between organisms.
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The best evidence that the Sun is a newcomer in the universe is
A) the existence of heavy elements in its composition. B) its relatively slow rate of spin. C) its high temperature as revealed by its color. D) its position in the galaxy. E) its very existence in spite of its high burning rate.
Strong evidence for evolution comes from the field of ____________________, which studies the geographic
distribution of ancient and present-day organisms. Fill in the blank(s) with the appropriate word(s).
In the process of photosynthesis, ________
A) kinetic energy of heat is used to combine the potential energy of oxygen and water B) potential energy in glucose is used to generate kinetic energy in heat C) potential energy in light is converted to kinetic energy of chemical bonds D) energy in light is converted to potential energy of chemical bonds
How big is 1 nm?
A) 1 x 10^-12 m B) 1 x 10^-9 m C) 1 x 10^-6 m D) 1 x 10^-3 m