The ____, which is made of transparent crystallin protein, covers the front of the eyeball
a. lens
b. sclera
c. cornea
d. iris
e. retina
c
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Double fertilization refers to
(a) fusion of two sperm nuclei and two egg cells. (b) fusion of one sperm nucleus with two polar nuclei and fusion of another with the egg cell nucleus. (c) maturation of the ovary into a fruit. (d) none of the above.
The difference between fungal endomycorrhizae and fungal endophytes is:
A. Endomycorrhizae live inside fungi and endophytes live inside plants. B. Endomycorrhizae form arbuscules that facilitate exchanges of water and food between the fungus and plant root cells, whereas endophytes invade plant cells and provide the plant with protective antibiotics and toxins. C. Endomycorrhizae are beneficial to its host plant but endophytes harm the host plant. D. Endomycorrhizae form arbuscules on plant roots that produce toxins killing parasitic nematodes, whereas endophytes assist in the transport of water through the plant. E. none of the other choices provided
This figure illustrates the life cycle of a
a. brown algae. b. green algae. c. water mold. d. plasmodial slime mold. e. cellular slime mold.
Most often, the internal environment of a cell has a higher concentration of solutes than is found in the environment outside.
A) True B) False