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Q4:
Which of the following is correct:
Which of the following is correct:
Solution :
Analytical Framework: Defining the Cell
To determine the correctness of cellular statements, we must evaluate the foundational tenets of the Cell Theory as proposed by Matthias Schleiden and Theodor Schwann, and later expanded by Rudolf Virchow.
Step 1: Evaluation of Core Theoretical Postulates
The following table outlines the validity of common propositions regarding cellular biology based on modern cytological standards:
| Proposition | Status | Justification |
|---|---|---|
| Cells are the fundamental unit of life. | Correct | All biological activity occurs at the cellular level [Cell Theory Axiom I]. |
| All cells arise from pre-existing cells. | Correct | Omnis cellula-e cellula [Per Rudolf Virchow, 1855]. |
| Viruses are considered true cells. | Incorrect | Viruses lack independent metabolic machinery and a lipid bilayer cellular membrane [Acellular nature]. |
Step 2: Visual Representation of Cellular Hierarchy
Step 3: Logical Synthesis
If the proposition being analyzed is "Cells arise from pre-existing cells," the conclusion is derived from the following synthesis:
- Biological Continuity: Genetic information $DNA$ is replicated and passed from parent cell to daughter cell [Mitosis/Meiosis].
- Biochemical Requirement: Cells require a pre-existing membrane structure and enzymatic environment to synthesize new components.
Therefore, the most accurate statement in the study of cellular biology is that all living organisms are composed of cells and products of cells, and all cells arise from pre-existing cells.
Final Solution: The correct statement is that all cells are derived from pre-existing cells (Omnis cellula-e cellula), as established by the Cell Theory.
More Questions from Class 11 Biology Cell – The Unit of Life EXERCISES
- Q1: Which of the following is not correct?
- Q2: New cells generate from
- Q3: Match the following Column I Column II (a) Cristae (i) Flat membranous sacs in stroma (b) Cisternae (ii) Infoldings in mitochondria (c) Thylakoids (iii) Disc-shaped sacs in Golgi apparatus
- Q5: What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
- Q6: How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane?
- Q7: Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.
- Q8: What are the characteristics of prokaryotic cells?
- Q9: Multicellular organisms have division of labour. Explain.
- Q10: Cell is the basic unit of life. Discuss in brief.
- Q11: What are nuclear pores? State their function.
- Q12: Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their functions. Comment.
- Q13(i): Describe the structure of the following with the help of labelled diagrams. (i) Nucleus
- Q13(ii): Describe the structure of the following with the help of labelled diagrams. (ii) Centrosome
- Q14: What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
CBSE Solutions for Class 11 Biology Cell – The Unit of Life
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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