Which of these hormones helps plants tolerate drought and cold?
A) Ethylene B) Abscisic acid C) Gibberellin D) Auxin E) Cytokinin
B
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Indifferent gonads develop
A) during the first two weeks of prenatal development. B) during the fifth week of prenatal development. C) during the ninth week of prenatal development. D) when the embryo becomes a fetus.
Which of the following is properly matched?
a. osteoblasts; bone breakdown b. osteocytes; initial bone formation c. osteoclasts; initial bone formation d. osteoclasts; bone breakdown e. osteoblasts; imprisoned in bony matrix
Which of the following cells form new bone in bone tissue?
A) osteons B) osteoblasts C) osteocytes D) fibroblasts
Which of the following is the correct sequence through which early development proceeds?
a. morula ? zygote ? gastrula ? blastula b. zygote ? blastula ? morula ? gastrula c. zygote ? blastula ? gastrula ? morula d. zygote ? gastrula ? blastula ? morula e. zygote ? morula ? blastula ? gastrula