Which zone produces the most global oxygen gas?
A) A
B) B
C) C
D) D
E) E
Answer: B
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In most flowering plants, one sperm nucleus fuses with an egg forming a zygote that develops into an embryo. Another sperm nucleus fuses with ____
a. the endosperm mother cell to produce three cells, each with one nucleus b. the endosperm mother cell, forming a diploid cell c. the endosperm mother cell, forming a triploid (3n) cell d. one of the smaller megaspores to produce what will eventually become the seed coat e. one of the smaller megaspores to produce a diploid endosperm
All land plants carry the gene LFY, which encodes the regulatory protein LEAFY but its effects on phenotype vary markedly in different plant groups. In which group of plants does LFY regulate the largest number of tissues?
1.ferns 2.flowering plants 3.gymnosperms 4.mosses
Net primary productivity in an ecosystem increases as mean annual temperature
A) and mean annual rainfall decrease. B) decreases and mean annual rainfall increases. C) increases and mean annual rainfall decreases. D) and mean annual rainfall increases.
The sharpest vision occurs at the ________, where the concentration of cones is highest.
A. optic nerve B. parallax C. area of the retina closest to the lens at the front of the eye D. fovea