Which element is a density-dependent factor that controls the size of a population?
a. wind velocity
b. light intensity
c. resource availability
d. temperature
e. wave action in an intertidal zone
ANSWER: c
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Why does sexual reproduction require both meiosis and syngamy?
A. The process of meiosis results in the production of gametes in which the number of chromosomes remains the same. During syngamy, two gametes fuse to form a new cell, and the number of chromosomes is restored to the full amount. Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained. B. The process of meiosis results in the production of gametes in which the number of chromosomes is reduced by half. During syngamy, two gametes fuse to form a new cell, and the number of chromosomes is restored to the full amount. Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained. C. The process of meiosis results in the production of gametes in which the number of chromosomes is doubled. During syngamy, gametes are reduced by half, and the number of chromosomes is restored to the full amount. Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained.
What does it mean if a plant is dioecious?
A. There is double fertilization of the embryo. B. Pollination and fertilization are separate events. C. There are separate male and female sporophytes. D. The sporophyte and the gametophyte are on the same plant.
The level of organization where factors such as
sunlight, rainfall, and temperature enter the picture is the a. organ system. b. ecosystem. c. biosphere. d. molecule. e. community.
Select the molecule that contains the least stored chemical energy:a
ethyl alcohol. b. pyruvate. c. glucose. d. lactate. e. oxygen.