Why do plant roots populate the A horizon most heavily? What will be an ideal response?
The first reason is that the A horizon is very near the surface, so even small root systems can reach it.
The second is that the A horizon is rich in decomposed organic material which the plant can use to
meet its mineral nutrient needs. The third is that being near the surface means the A horizon will
wetted regularly during precipitation.
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Which of the following statements is NOT true about gamete formation in mammals?
A. In the female, the separation of cytoplasm is unequal during meiosis. B. Only one of the four cells resulting from meiosis goes on to become an oocyte. C. Only one of the four cells resulting from meiosis goes on to become an egg, which becomes a zygote upon fertilization by a sperm cell. D. The polar bodies formed during meiosis in the female can participate in fertilization with sperm. E. The cytoplasm is diminished during development of sperm, and a flagellum is formed to give sperm locomotion.
Which of the following are principles of the cell theory or cell doctrine?
A. All living things are composed of one or more cells. B. Cells are the smallest unit of living organisms. C. New cells come only from pre-existing cells by cell division. D. Cells are the smallest unit of living organisms and new cells form from pre-existing cells by cell division. E. All living organisms are composed of one or more cells, cells are the smallest units of life, and new cells come only from pre-existing cells by cell division.
Sperm mature and are stored in the epididymis
a. True b. False Indicate whether the statement is true or false
What distribution pattern is the most common in the natural world?
a. random b. uniform c. clumped d. stratified or layered e. bimodal