Phototropism is a plant response controlled largely by which color of light?
A. violet
B. green
C. blue
D. red
E. None of the answers is correct.
Answer: C
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The pollen tube grows from the ________ to the ________
a. sperm / stigma b. ovule / anther c. stigma / ovule d. anther / sperm
A mantle is found only among the:
a. arthropods b. annelids c. echinoderms d. mollusks e. chordates
The highly toxic Aspergillus infects
A) wheat. B) bread. C) human skin. D) milk. E) peanuts.
Why do many plants use the photoperiodic pathway to regulate the timing of flower formation?
A. This allows plants to link flowering to day length, which corresponds to the season when conditions are optimal. B. Flower petals carry out high levels of photosynthesis and require high light conditions. C. A minimum amount of light is always necessary for flowering. D. This allows plants to link flowering to temperature, which corresponds to the season when conditions are optimal.