Many plants have fungi in a close symbiotic relationship with the plant roots. These are
a. root nodules.
b. mycorrhizae.
c. parenchyma.
d. sclerenchyma.
e. stomata.
B
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Which group in a food web is responsible for returning inorganic compounds back to the environment?
A. tertiary consumers B. decomposers C. primary producers D. primary consumers E. secondary consumers
Mendel knew very little about genetics and nothing about genes or chromosomes. However, his law of independent assortment explains a fundamental phenomenon of genetics. What is that phenomenon?
a. formation of the cleavage furrow and separation of the two progeny in telophase b. crossing over during gametogenesis c. random sorting of the homologous chromosomes during metaphase I d. fertilization and formation of the zygote during sexual reproduction
Which is not a density-dependent, growth-limiting factor?
a. predation b. drought c. parasitism d. competition e. disease
Which of the following groups provides protection and nourishment to the embryo?
A. all plants B. angiosperms only C. gymnosperms only D. lycophytes only E. bryophytes only