The pigment responsible for photoperiodism is
a. chlorophyll.
b. xanthophyll.
c. anthocyanin.
d. phytochrome.
e. phytoerythrin
D
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If you were to travel to a region where rice is grown in paddies, you would see lots of the water fern Azolla growing in the water. A farmer would tell you this is done because Azolla is considered a “natural fertilizer. Explain why this is the case.
What will be an ideal response?
In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over
spotted (s). If two dihybrids (Bb Ss) were crossed, the most common phenotype would be a. black and solid. b. black and spotted. c. red and solid. d. red and spotted. e. none of these.
What level of biological organization is between the cell and the organ?
a) organism b) atom c) tissue d) organelle
The placenta
A) allows diffusion of nutrients, gases, and wasted between the mother and the fetus. B) consists only of maternal tissue. C) is a site in which bacteria have never been detected. D) consists only of fetal tissue. E) allows mixing of maternal and fetal blood.