How do multicellular organisms function efficiently?

Specialized cells form tissues, organs, and organ systems to perform coordinated activities.

Why are cells microscopic?

Cells are small to increase surface area to volume ratio for efficient transport of materials.

Do all cells have the same shape and size?

No, cell shape and size vary depending on their function.

What is the function of cilia and flagella?

They help in movement and locomotion of cells.

What are centrosomes?

Centrosomes are organelles near the nucleus that help in spindle formation during cell division.

What are chromatin fibers?

Chromatin fibers are thin threads in the nucleus that condense to form chromosomes during cell division.

What is the difference between plant and animal cells?

Plant cells have cell walls and chloroplasts; animal cells do not.

Which organelle helps in detoxification of harmful substances?

Smooth endoplasmic reticulum plays an important role in detoxification.

Which cell organelle helps in photosynthesis?

Chloroplasts help in photosynthesis by converting sunlight into chemical energy.

Why is the nucleus called the control center of the cell?

It controls all metabolic activities and contains hereditary information.

Meiosis is reduction division occurring in sex cells, producing four haploid gametes.

Mitosis is the division of a somatic cell resulting in two identical daughter cells.

Name the types of cell division.

The types are mitosis and meiosis.

What is cell division?

Cell division is the process by which one cell divides into two or more cells for growth and repair.

What happens in an isotonic solution?

There is no net movement of water; the cell retains its size and shape.

What happens when a cell is placed in a hypertonic solution?

Water leaves the cell, causing it to shrink.

What happens when a cell is placed in a hypotonic solution?

Water enters the cell, causing it to swell.

Plasmolysis occurs when a plant cell loses water and the cytoplasm shrinks away from the cell wall.

Osmosis is the movement of water molecules through a semipermeable membrane from lower to higher solute concentration.

Diffusion is the free movement of molecules from a region of high concentration to low concentration.

What are peroxisomes?

Peroxisomes contain enzymes for lipid metabolism and detoxification processes.

What are leucoplasts?

Leucoplasts are colorless plastids that store starch, oil, and proteins in plant cells.

Chromoplasts contain pigments other than chlorophyll that give color to flowers and fruits.

What is the function of chloroplasts?

Chloroplasts contain chlorophyll and capture sunlight for photosynthesis.

Name the types of plastids.

Chloroplasts, chromoplasts, and leucoplasts are types of plastids.

Plastids are plant cell organelles involved in photosynthesis, storage, and pigment synthesis.

What material forms the plant cell wall?

The plant cell wall is made up of cellulose.

What is the function of the cell wall?

The cell wall provides structure, support, and protection to plant cells.

How does the size of vacuoles vary in plant and animal cells?

Plant cells have large central vacuoles; animal cells have smaller, temporary vacuoles.

What is the function of vacuoles?

Vacuoles store water, nutrients, and help maintain pressure and rigidity in plant cells.

Why are lysosomes called the suicidal bags of the cell?

Because they can digest their own cell when it is damaged or old.

Lysosomes are sac-like structures containing digestive enzymes that break down waste materials.

What is the role of the Golgi apparatus?

It modifies, sorts, and packages proteins and lipids for transport inside or outside the cell.

What are the two types of ER?

Rough endoplasmic reticulum (with ribosomes) and smooth endoplasmic reticulum (without ribosomes).

What is the function of the endoplasmic reticulum (ER)?

The ER helps in synthesis and transport of proteins and lipids within the cell.

Ribosomes are organelles responsible for protein synthesis.

Why is mitochondria called the powerhouse of the cell?

Because it generates energy needed for metabolic processes in the form of ATP.

What is the function of mitochondria?

Mitochondria produce energy in the form of ATP, through the process of cellular respiration.

In prokaryotic cells, nucleoid is an undefined region containing genetic material without a membrane.

The nucleus contains chromosomes composed of DNA and proteins, controlling heredity and cell activities.

What are cell organelles?

Cell organelles are specialized structures like mitochondria, Golgi apparatus, and ribosomes that perform specific functions.

Cytoplasm is the jelly-like substance between the nucleus and cell membrane containing organelles.

What is the function of the plasma membrane?

The plasma membrane is selectively permeable and controls material movement in and out of the cell.

Define eukaryotic cell.

Eukaryotic cells have a well-defined nucleus and membrane-bound organelles like plant and animal cells.

Define prokaryotic cell.

Prokaryotic cells are simple cells without a true nucleus or membrane-bound organelles, like bacteria.

What does the cell theory state?

It states that all living organisms are made of cells and new cells arise from pre-existing ones.

Who proposed the cell theory?

The cell theory was proposed by Schleiden and Schwann, and later modified by Rudolf Virchow.

What are the main types of cells?

The two main types of cells are prokaryotic and eukaryotic cells.

Who discovered the cell?

Robert Hooke discovered the cell in 1665 while observing cork cells under a microscope.

What is the fundamental unit of life?

The cell is the fundamental unit of life found in all living organisms responsible for structure and function.

The Fundamental Unit of Life-True/False

This set of 25 True/False questions on "The Fundamental Unit of Life" covers every key concept required for a clear understanding of cell biology at the Class 9 level. Students will reinforce their knowledge about cell structure, functions, organelles, and differences between plant and animal cells. Each statement includes accurate answers and brief explanations, allowing learners to test essential facts about cell theory, the discovery of cells, differences between prokaryotic and eukaryotic cells, and the roles of nucleus, mitochondria, lysosomes, and more. This resource is suitable for exam revision, quizzes, or self-study practice.

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The Fundamental Unit of Life-True/False

by Academia Aeternum

1. The cell is the basic structural and functional unit of life.

True

False

2. All living organisms are made of cells.

True

False

3. Robert Hooke discovered cells by observing a slice of cork.

True

False

4. Plasma membrane is also known as a selectively permeable membrane.

True

False

5. Cell wall is present in both plant and animal cells.

True

False

6. Nucleus is called the control center of the cell.

True

False

7. Prokaryotic cells have a well-defined nucleus.

True

False

8. Cytoplasm is the jelly-like substance inside the cell membrane.

True

False

9. Plant cells do not contain mitochondria.

True

False

10. Plastids are absent in animal cells.

True

False

11. Lysosomes are called the suicide bags of the cell.

True

False

12. Cell membrane is made mainly of lipids and proteins.

True

False

13. Ribosomes are responsible for protein synthesis.

True

False

14. Vacuoles are larger in animal cells than in plant cells.

True

False

15. Mitochondria are also called the powerhouse of the cell.

True

False

16. Cells reproduce by division.

True

False

17. Chloroplasts are present in animal cells.

True

False

18. Genes are located in the cytoplasm.

True

False

19. Cell wall provides rigidity and protection to plant cells.

True

False

20. Osmosis is the movement of water across a selectively permeable membrane.

True

False

21. Golgi apparatus is involved in packaging and transport of materials in the cell.

True

False

22. All cells have the same size and shape.

True

False

23. A cell having a nucleus and membrane-bound organelles is called a eukaryotic cell.

True

False

24. Cells perform different functions like growth, repair, and reproduction.

True

False

25. All cell organelles are suspended in the nucleus.

True

False

The Fundamental Unit of Life-True/False

TRIGONOMETRIC FUNCTIONS-Exercise 3.2

TRIGONOMETRIC FUNCTIONS-Exercise 3.1

The Fundamental Unit of Life-True/False

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