Why was Charles Darwin initially puzzled by the observation that worker bees die when they sting an intrud-er to their hive? (The bee's stinger is ripped from the bee's abdomen, causing a fatal injury.)
a. All defensive behaviors result in the guaranteed destruction of the defender.
b. Such self-sacrifice is widespread in many different groups of animals.
c. He found it hard to imagine how such behavior could evolve, as a defending worker's chance of survival is zero.
d. The stinging apparatus appeared to be too complex to have evolved.
C
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Darwin’s experiments on phototropism illustrated that ____
a. plant stems bend away from bright lights b. signals from plant roots control phototropism c. an opaque cap placed over a shoot tip will cause a plant to bend toward light, but will inhibit growth d. a translucent cap placed over a shoot tip will cause a plant to bend toward light, but will inhibit growth e. a translucent cap placed over a shoot tip will cause a plant to both grow and bend toward light
The openings in the exoskeleton of arthropods that allow oxygen into highly branched internal tubules that reach individual body cells are
A. spicules. B. alveoli. C. tracheae. D. spiracles. E. gills.
What is a major role that fungi play in ecosystems?
A) Recycling nutrients from dead organisms back into the food chain B) Fixing carbon from the atmosphere C) Synthesizing glucose from carbon dioxide and water D) Photosynthesis
The connection between structure and ________ is a basic concept of biology
A) species B) adaptation C) function D) sex