In pines, an embryo is a(n) _____.
a) food reserve for the immature sporophyte
b) immature female gametophyte
c) immature sporophyte
d) immature male gametophyte seed
Ans: c) immature sporophyte
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The uplift of the Isthmus of Panama, a geological event that occurred about five million years ago, separated
populations of marine organisms and led to ____.
a. allopatric speciation b. sympatric speciation c. gametic isolation d. hybrid sterility e. hybrid inviability
The absence of sweat glands in cetaceans aids in
a. maintaining body heat. b. conserving water. c. increasing internal salinity. d. reducing drag. e. swimming efficiency.
Why can an insect eye detect motion better than the human eye?
a. Insects' eyes lack overlapping visual fields, and they are able to gather information from a narrow area. b. Insects have compound eyes that are very good for depth perception and hence detecting movement. c. The multiple ommatidia allow the insect eye to focus more acutely on an image. d. The lens of the insect eye is concaved, which provides better focusing capabilities than the convex lens of the human eye. e. The total range of vision for an insect eye is much narrow than that for a human eye
All the following are important functions of the cytoskeleton EXCEPT
A) maintenance of organization in the cell. B) movement of organelles. C) maintenance of shape. D) storage of food molecules. E) assistance during cell division.