Chemical cues that help guide a developing pollen tube toward an ovule are released by the ____.
a. antipodal cells b. synergids c. egg d. central cell e. sperm
ANSWER: b
Biology & Microbiology
You might also like to view...
Which carbohydrate polymer coils up?
a. glycogen b. cellulose c. starch d. chitin e. all polysaccharides
Biology & Microbiology
Immigration and __________ permanently affect
population size, but __________ does not. Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
The two copies of a replicated chromosome are called sister_______.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
Where do plants get most of their mass?
A) from nitrogen in the atmosphere B) from carbon dioxide in the atmosphere C) from water, as van Helmont predicted D) from organic molecules taken up from the soil
Biology & Microbiology