Qualifying Exam in Science - Grade 7

Our knowledge of cellular organization is made possible by the development of more advanced powerful microscopes. Three attributes of compound microscopes are of particular importance; magnification, resolution, and contrast. Which of the mentioned attributes allows us to increase the actual size of the object being viewed?

• Resolution

• Contrast

• Magnification

• Combination

A light microscope is capable of magnifying an object for up to 500 times better than that of the unaided human eye. Which two parts of the light microscope are used to magnify the image of an object?

• Objectives and Ocular lens

• Revolving nosepiece and coarse adjustment knob

• Eyepiece and fine adjustment knob

• Coarse and fine adjustment knobs

All living things are composed of cells. Viewing these tiny cells and its tiny components is made possible by the development of a tool. What do you call the optical instrument that is used to magnify and view tiny objects?

• Microscope

• Telescope

• Stethoscope

• Cystoscope

What is the function of the objective lenses in a compound microscope?

• To hold the slide in place

• To magnify the specimen at different levels

• To control the amount of light passing through

• To support the base of the microscope

Which part of the microscope supports the slide being observed?

• Base

• Arm

• Stage

• Diaphragm

What is the purpose of the coarse and fine adjustment knobs?

• To switch between objectives

• To magnify the image

• To adjust the focus of the image

• To move the light source

Which part connects the eyepiece to the objective lenses and maintains proper distance?

• Base

• Arm

• Stage clips

• Body tube

High Power Objective Lens (HPO) used to view a specimen that allows detailed and close-up look at the specimen's fine structures. The cell has been viewed and magnified 430x under a 43x HPO, what is the magnifying power of the eyepiece used?

• 5x

• 10x

• 15x

• 20x

The bodies of multicellular organisms are organized on the basis of tissues, organs, and systems. Which statement below is CORRECT about an organ system?

• It is group of organs that work together to perform a certain function in an organism's body.

• The skeletal system of a human body is more important than the other organ system.

• The group of cells is organized to make an organ system

• It is a group of organisms of the same kind functioning independently.

Life is found almost everywhere on earth. It is orderly sequenced from the most basic to the most complex. Which of the following arrangements below BEST describes the sequence of events?

• cell - tissues - organ - organ system - organism

• organism - organ system - organ - tissue - cell

• organ - organ system - population - ecosystem

• organ system - population - ecosystem - biosphere