Which of the following is an example of thigmotropism?
a. vines bending around a pole as they grow up it
b. seedlings bending towards the light
c. roots growing down into the soil
d. a shoot on its side turning to grow upwards
e. leaves bend toward the sunlight
ANSWER: a
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Match the following items with the correct phrases.
_______1. In the nitrogen cycle, bacteria called ____________________ convert atmospheric nitrogen gas into ammonia in the soil. _______2. ____________________ live in the root nodules of legumes such as alfalfa and clover. _______3. ____________________ are capable of converting the nitrogen within a dead plant or animal into ammonia in the soil. _______4. In the nitrogen cycle, soil organisms called ____________________ convert ammonia into nitrites, and nitrites into nitrates. _______5. In the nitrogen cycle, soil organisms called ____________________ convert the nitrogen in nitrates to nitrogen gas in the atmosphere. a. cyanobacteria b. denitrifying bacteria c. nitrifying bacteria d. nitrogen-fixing bacteria e. saprophytes
Adventitious roots arise from a plant’s stem
Indicate whether the statement is true or false.
When scientists inserted the Bt toxin gene into plant cells they created a
A. transgenic plant. B. stem cell. C. new species. D. clone. E. monohybrid.
Long-lasting pesticides such as DDT
a. are target-specific. b. are the most effective control over pests. c. build up in concentration as they pass up a food chain. d. break down after the organism that receives the pesticide dies. e. do all of these.