Most of the photosynthetic activity in plants takes place in the
a) mesophyll.
b) guard cells.
c) stomata.
d) xylem.
Ans: a) mesophyll.
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Muscle fibers (muscle cells) are filled with myofibrils which in turn are filled with the contractile filaments myosin and actin.
a. true b. false
The layer of a forest in which decomposition takes place and mineral nutrients are released for reuse by plants is called the
A) canopy. B) understory. C) herb layer. D) forest floor.
While walking through a wooded area, you see a large fern that has fronds taller than you! You look up and on the backs of the fronds, you see small brown circles. You congratulate the fern on the beautiful children it has produced. What is the name of the fern offspring that you saw?
a. sperm b. gametophyte c. sporangia d. seeds
A pine tree is a(n) ____, and a pine cone is a(n) ____
a. angiosperm; a seed b. haploid plant body; dipold plant body c. sporophyte; a gametophyte d. gametophye; a sporophye e. egg; pollen grain