Biology 9th Chap 3 : Topic 1 - Maryam Publications

Biology Chapter 3 : Topic 1

Cell as the Basic Unit of Life

1 / 16

Which observation best supports the statement that the cell is the basic unit of life?

A) Every living organism is made up of one or more cells.

B) Organisms respond to stimuli.

C) All living organisms contain water.

D) Living organisms require energy.

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A scientist discovers a structure that can perform all life processes independently. What would it most likely be?

A) Tissue

B) Organelle

C) Cell

D) Organ

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Why is a tissue not considered the basic unit of life?

A) It cannot be seen under a microscope.

B) It is larger than an organ.

C) It lacks water.

D) It is made up of cells that perform specific functions.

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Which of the following demonstrates that a unicellular organism is a complete living unit?

A) It lacks a cell membrane.

B) It performs all life functions within a single cell.

C) It depends on other organisms for all activities.

D) It consists of many tissues.

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An injury destroys some skin cells. The damaged area heals because surviving cells can:

A) Convert into minerals

B) Form organs directly

C) Produce tissues without division

D) Divide and replace lost cells

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Which statement is most closely related to the idea that cells are structural units of living organisms?

A) Cells form tissues, organs, and organ systems.

B) Cells store genetic information.

C) Cells respond to environmental changes.

D) Cells release energy.

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If all cells were removed from a leaf, what would remain?

A) Chlorophyll only

B) No living structure of the leaf

C) Living tissues only

D) A functioning leaf

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Which example best illustrates a cell functioning as a unit of life?

A) The stomach digesting food

B) The circulatory system transporting materials

C) Bone tissue supporting the body

D) A red blood cell transporting oxygen

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The discovery of cells led scientists to conclude that:

A) Every organism contains chlorophyll.

B) All living organisms share a common structural basis.

C) All cells have the same shape.

D) All organisms have tissues.

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Which level of organization comes immediately after the cell?

A) Organism

B) Organ system

C) Tissue

D) Organ

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Which sequence correctly shows biological organization?

A) Cell → Organ → Tissue → Organism → Organ System

B) Tissue → Cell → Organ → Organism → Organ System

C) Organ → Tissue → Cell → Organism → Organ System

D) Cell → Tissue → Organ → Organ System → Organism

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Why can a unicellular organism survive without tissues or organs?

A) Its cell performs all necessary life functions.

B) It uses other organisms' tissues.

C) It lacks genetic material.

D) It has no metabolism.

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Which characteristic distinguishes a cell from an organelle?

A) It contains proteins.

B) It can perform all basic life processes.

C) It contains water.

D) It has a specific function.

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A muscle tissue is damaged. Which level of organization is directly responsible for replacing the damaged tissue?

A) Organ system

B) Organism

C) Cell

D) Organ

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Which statement provides evidence that cells are functional units of life?

A) Cells perform activities such as respiration and excretion.

B) Cells differ in shape.

C) Cells can be microscopic.

D) Cells contain water.

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Four diagrams represent these levels: I—smooth muscle tissue, II—mitochondrion, III—DNA macromolecule, and IV—blood vessel organ. Which sequence shows descending biological organization from largest to smallest?

A) IV, II, I, III

B) III, II, I, IV

C) III, I, II, IV

D) IV, I, II, III

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