Characteristics of Life & Biological Diversity — Drills · Grade 7 Science

Chapter: Scientific Inquiry & Diversity of Life

What these drills covers

By the end of Characteristics of Life & Biological Diversity you should be able to:

4 questions, multiple choice and written answer, each with a worked explanation.

Vocabulary used: organism, homeostasis, prokaryotic, eukaryotic, classification.

Problem 1

Which record supports a prokaryotic cell?
  1. No DNA at all
  2. DNA and ribosomes but no membrane-enclosed nucleus
  3. A nucleus and no membrane
  4. Only a plastic motor
Answer and explanation

DNA and ribosomes but no membrane-enclosed nucleus

Prokaryotes contain genetic material and ribosomes without a membrane-enclosed nucleus.

Problem 2

Why can an individual unable to reproduce still be living?
Answer and explanation

Living status involves functioning cellular organization and interacting life processes. Reproduction characterizes life cycles and populations; it is not required from every individual at every time.

Problem 3

Why does movement alone not establish life?
Answer and explanation

Nonliving objects can move through motors, wind, or gravity. Cellular organization and interacting life processes provide stronger evidence.

Problem 4

Can a living cell lack a nucleus?
Answer and explanation

Yes. Bacteria and other prokaryotes lack a membrane-enclosed nucleus but carry genetic material and perform cellular processes.

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