Most water transport in stems takes place in
A. heartwood
B. pith
C. phloem
D. sapwood
Ans: A. heartwood
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Neoteny refers to:
A. the case where a sexually mature organism still retains the physical characteristics of the juvenile form. B. the case where a sexually mature organism will lose most of the physical characteristics of the juvenile form. C. the case where a sexually immature organism retains the physical characteristics seen in the adult form. D. the case where a sexually immature organism will lose most of the physical characteristics of the juvenile form.
Which of the following choices is not a function of astrocytes?
a. engulf dead or dying cells b. assist in immune defense c. stimulate formation of the blood-brain barrier d. take up neurotransmitters
Triticale is an allopolyploid hybrid between wheat and rye. Some strains of Triticale show agricultural promise because (Select all that apply.)
A) they combine the high yields of wheat with the ability adapt to unfavorable environments like rye. B) the grain is high in protein, especially the amino acid lysine. C) they combine desirable traits from wheat and rye in one crop plant. D) they are sterile because the wheat and rye chromosomes cannot pair during meiosis.
Explain why mutualism is sometimes viewed as ‘reciprocal exploitation’. What will be an ideal response?