Which of these are produced directly by meiosis in pine?
(a) sperm cells.
(b) pollen grains.
(c) microspores.
(d) microspore mother cells.
(c) microspores.
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In which order were the key features of complex multicellularity likely to have appeared?
A. cell adhesion, cell communication, regulated growth and development B. cell communication, cell adhesion, regulated growth and development C. regulated growth and development, cell communication, cell adhesion D. regulated growth and development, cell adhesion, cell communication
Herpes simplex enhances the spread of AIDS
Indicate whether this statement is TRUE or FALSE.
Honeydew is essentially
a. xylem sap forced out of the margins of leaves. b. xylem sap harvested by honeybees. c. phloem sap harvested as syrup. d. xylem sap separated from syrup. e. phloem sap leaving the anus of an aphid.
Perfect flowers must have
a. reproductive structures of both sexes. b. petals. c. sepals. d. an attractive scent. e. all of these.