The primary role of the two sperm in the pollen is to
A. produce the pollen tube.
B. prevent embryo production.
C. release proteins for germination.
D. ensure fertilization of the egg and the central cell.
Answer: D
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There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome
by excessive mutations. Since the rotifers develop from eggs, but asexually, what can you predict? A) The eggs and the zygotes are all haploid. B) The animals are all hermaphrodites. C) While asexual, both males and females are found in nature. D) All males can produce eggs. E) No fertile males can be found.
The organ(s) of the respiratory system that contain alveoli is (are) ________
A) bronchioles B) bronchi C) the glottis D) lungs
Fertilization by multiple sperm is blocked by
a. the exocytosis of secretory vesiclesthat coat the egg. b. a hardening of the plasma membrane. c. a hyperpolarization of the plasma membrane. d. the release of spermicidal jelly.
The earliest life-forms were photosynthetic eukaryotes
Indicate whether the statement is true or false