In angiosperms, after fertilization, the triploid cell gives rise to:
a. a fertilized ovule
b. a seed
c. an embryo sporophyte
d. endosperm
e. a pollen grain
d
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An organism's environment consists of __________.
Fill in the blank(s) with the appropriate word(s).
The Electron Tower
What will be an ideal response?
The density of Douglas firs in an old-growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each. The number of fir trees in the plots is 10, 12, 7, and 11, respectively. What is the estimated density of firs in the forest?
A) 2.5 trees per hectare B) 5 trees per hectare C) 10 trees per hectare D) 20 trees per hectare E) 25 trees per hectare
One of the factors that helps animal-pollinated flowering plants transfer pollen to plants of the same species is that
A) pollinators are able to rapidly extract nectar from any species of flower, regardless of the pollinators' past or recent experience with a given flower type. B) most pollinators broadly use many different types of flowers. C) many pollinators have limited learning capacities and are most successful at obtaining food if they continue to visit the same type of flower after learning how to extract its nectar. D) pollinators only visit flowers that produce massive amounts of pollen.