The endosperm of a plant ____
a. is the food supply for the new sporophyte plant
b. is composed of haploid tissue
c. protects the young embryo within a seed
d. provides a connection between the ovary of a flower and a developing seed
e. produces sperm cells
ANSWER: a
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The sum of all chemical reactions in a cell is referred to as ____
Fill in the blank with the appropriate word.
In phloem movement, ____ does not serve as a source
a. photosynthesizing cells in a leaf b. roots c. photosynthesizing cells in a stem d. food storage cells in a stem e. soil
In the absence of competition from other males:
a. Female chickens mated more often with the male present. b. The quantity of sperm a male used to inseminate a female decreased. c. Once a male has inseminated a female, additional sperm may do little to increase the probabil-ity of fertilization. d. Both B and C
Which ion is actively transported to regulate pollen growth and fertilization?
a. hydrogen b. potassium c. sodium d. calcium e. magnesium