Answer the following statements true (T) or false (F)
1.Lichens and mosses that can grow on and erode rock would be considered pioneer species.
2.All communities eventually reach the climax state, in which all components are consistent.
3.Energy is constantly being recycled within an ecosystem.
4.Raw sewage within a water ecosystem can kill fish because respiration by the microbes in the sewage reduces the concentration of oxygen within the water.
5.In a process called denitrification, bacteria convert NO – to N .
1.TRUE
2.FALSE
3.FALSE
4.TRUE
5.FALSE
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Most bacterial cells keep from bursting in a hypotonic environment by:
a. an efficient water pump. b. a tough cell membrane. c. pumping large quantities of salts into the cell. d. a rigid cell wall. e. a stiff capsule.
Fruits often ripen faster when placed in closed paper bags because of the effect of
(A) cytokinin (B) abscisic acid (C) CO2 (D) gibberellin (E) ethylene
Paramecia use cilia for locomotion and for gathering organic matter. How are rotifers similar?
A. Rotifers and ciliates are thought to have given rise to all other animal phyla. B. The corona is made of cilia, and used for swimming and feeding. C. Both lack a gut. D. Rotifers are single-celled protists.
Carbolfuchsin is a dye used in ________ stain(s)
A) the Gram B) the endospore C) the acid-fast D) the flagellar E) both the acid fast and flagellar