Choose the letter of the best match from the following:A. Third trimester of pregnancyB. Second month of pregnancyC. First month of pregnancyD. Second trimester of pregnancyE. Third month of pregnancyThe embryo is now called the fetus.
What will be an ideal response?
D
D. second trimester of pregnancy
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In a root nodule, the gene coding for nitrogenase _____
A) is inactivated by leghemoglobin B) is absent in active bacteroids C) is found in the cells of the pericycle D) protects the nodule from nitrogen E) is part of the Rhizobium genome
At low population density, __________ is favored,
quickly producing as many offspring as possible. Fill in the blank(s) with the appropriate word(s).
Aphids are small insects that insert their mouthparts into a plant to obtain phloem sap. Which would be the best way to determine if aphids must actively draw phloem sap into their digestive tract or if hydrostatic pressure in the phloem tube could force
the sap into them? A) Isolate a phloem tube from a plant, allow an aphid to insert its mouthparts, and see if the aphid can still take up sap from it. B) Measure relative rates of sugar manufacture in leaves with and without aphids. C) Insert mouthparts removed from an aphid, without including the digestive tract, into phloem sap and see if sap keeps flowing through them.
When guard cells are ________ a stomatal pore opens between them.
A. flaccid B. turgid C. overextended D. solute depleted E. ionically charged