TEAS Reading Practice Test Related

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This excerpt is from The Life-Story of Insects by Geo H. Carpenter.

Insects as a whole are preeminently creatures of the land and the air. This is shown not only by the possession of wings by a vast majority of the class, but by the mode of breathing to which reference has already been made, a system of branching air-tubes carrying atmospheric air with its combustion-supporting oxygen to all the insect's tissues. The air gains access to these tubes through a number of paired air-holes or spiracles, arranged segmentally in series.

It is of great interest to find that, nevertheless, a number of insects spend much of their time under water. This is true of not a few in the perfect winged state, as for example aquatic beetles and water-bugs ('boatmen' and 'scorpions') which have some way of protecting their spiracles when submerged, and, possessing usually the power of flight, can pass on occasion from pond or stream to upper air. But it is advisable in connection with our present subject to dwell especially on some insects that remain continually under water till they are ready to undergo their final molt and attain the winged state, which they pass entirely in the air.

The preparatory instars of such insects are aquatic; the adult instar is aerial. All may-flies, dragon-flies, and caddis-flies, many beetles and two-winged flies, and a few moths thus divide their life-story between the water and the air. For the present we confine attention to the Stoneflies, the May-flies, and the Dragon-flies, three well-known orders of insects respectively called by systematists the Plecopteran, the Ephemeroptera, and the Odonata.

In the case of many insects that have aquatic larvae, the latter are provided with some arrangement for enabling them to reach atmospheric air through the surface-film of the water. But the larva of a stone-fly, a dragon-fly, or a may-fly is adapted more completely than these for aquatic life; it can, by means of gills of some kind, breathe the air dissolved in water.

Why do some insects have a life cycle divided between water and air?

  • A. To highlight the adaptability of these insects.
  • B. To illustrate the different environmental challenges they face.
  • C. To describe the process of metamorphosis in these insects.
  • D. To show the evolutionary advantages of such a life cycle.
Correct Answer: D

Rationale: The correct answer is D because the life cycle of insects is divided between water and air to demonstrate the evolutionary advantages of this adaptation. Insects have evolved to inhabit both aquatic and aerial environments, allowing them to thrive in diverse conditions. Choice A is incorrect because the division between water and air in the life cycle does not solely highlight adaptability but also evolutionary strategies. Choice B is incorrect because the question focuses on the reason for the specific division in the life cycle, not on environmental challenges. Choice C is incorrect because while metamorphosis is part of the life cycle, it does not directly explain why it is divided between water and air.