Which of the following organic macromolecules provides energy as well as structure to plants and animals?
a. proteins
b. lipids
c. carbohydrates
d. nucleic acids
c. carbohydrates
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Which group of Agnathan does not possess any sign of rudimentary vertebrae or vertebral column?
1.Conodonts 2.Hagfishes 3.Lampreys 4.Ostracoderms
Topsoil is richest in
a. minerals b. sand. c. clay. d. organic matter e. none of these
Which of the following statements about monocots is true?
a. They lack sclerenchyma tissue. b. They have a well-developed vascular cambium. c. They do not produce bark. d. Their lateral meristems give rise to wood. e. Secondary growth occurs rather slowly.
Which observation would be evidence for allopatric speciation among finch species of the Galápagos Islands?
A. The birds are closely related to birds found on the mainland. B. No pairs of sister species formed on the same island. C. Pairs of sister species can be found on adjacent islands. D. Specific beak sizes are adaptations to the seeds of different species. E. Many different species have been found on the islands.