Chapter 1, Problem 1STP

Summary Introduction

Introduction:

The term observation means to analyze the knowledge of the outside world by seeing it or recording information from scientific experiments. Moreover, in a lab the data recorded or received is termed as the observation.

Answer to Problem 1STP

Correct option:

Option (C), butterflies eat nectar from flowers.

Explanation of Solution

Explanation/justification for the correct answer:

Option (C) is butterflies eat nectar from flowers. When butterflies eat nectar from the flowers, then it is easily observed by the human eyes. Both the butterflies and the flowers are macroscopic living beings. So, it is a kind of direct observation, where scientists need not perform any experiment. Hence, this option is correct.

Explanation for incorrect answer:

Option (A) is ants communicate by airborne chemicals. To analyze how ants communicate can only be observed by certain experiments. The communication between ants cannot be directly observed. Hence, this option is incorrect.

Option (B) is birds navigate by using magnetic fields. The magnetic field in birds can only be determined by studying the anatomy of birds or by setting up an experiment. This cannot be directly observed. Hence, this option is incorrect.

Option (D) is fish feel vibrations through special sensors. If fish feels vibrations through special sensors or not is observed by keeping it near sensors. For this, experiments needs to be set up and readings should be noted. It cannot be observed directly. Hence, this option is incorrect.

Conclusion

Option (C), butterflies eat nectar from flowers is the correct answer.