Chapter 8: Cell The Unit of Life — Online MCQ Test
BIOLOGY · Grade 11 · CBSE(NCERT)
Practice Chapter 8: Cell The Unit of Life with a free chapter-wise online MCQ test.
This chapter covers: Cell Theory Prokaryotic Cell Eukaryotic Cell Cell Membrane Nucleus Cytoplasm Cell Organelles Mitochondria Ribosome Endoplasmic Reticulum.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 8: Cell The Unit of Life — Important Questions & Answers
Who proposed the cell theory?
- A. Schleiden and Schwann
- B. Darwin and Wallace
- C. Mendel and Morgan
- D. Virchow and Pasteur
Answer: A. Schleiden and Schwann
Schleiden and Schwann proposed the cell theory, stating that all living organisms are made of cells.
Schleiden and Schwann proposed the cell theory, stating that all living organisms are made of cells.
The cell is called the basic structural unit of life because it:
- A. stores only water and salts
- B. performs all life processes
- C. is found only in animals
- D. has a rigid wall in all organisms
Answer: B. performs all life processes
A cell carries out essential life processes such as nutrition, respiration, and reproduction, making it the basic unit of life.
A cell carries out essential life processes such as nutrition, respiration, and reproduction, making it the basic unit of life.
Which of the following is a prokaryotic cell?
- A. Bacterial cell
- B. Human cheek cell
- C. Onion peel cell
- D. Parenchyma cell
Answer: A. Bacterial cell
Bacteria are prokaryotes and lack a true nucleus and membrane-bound organelles.
Bacteria are prokaryotes and lack a true nucleus and membrane-bound organelles.
The fluid present inside the cell membrane but outside the nucleus is called:
- A. Nucleoplasm
- B. Cytoplasm
- C. Plasma
- D. Protoplasm wall
Answer: B. Cytoplasm
Cytoplasm is the jelly-like substance between the plasma membrane and the nuclear membrane.
Cytoplasm is the jelly-like substance between the plasma membrane and the nuclear membrane.
Which of the following is NOT a membrane-bound organelle?
- A. Mitochondrion
- B. Ribosome
- C. Endoplasmic reticulum
- D. Nucleus
Answer: B. Ribosome
Ribosomes are non-membranous structures, while mitochondria, ER, and nucleus are membrane-bound.
Ribosomes are non-membranous structures, while mitochondria, ER, and nucleus are membrane-bound.
In a prokaryotic cell, the genetic material is generally present in the form of:
- A. Linear chromosomes enclosed in nucleus
- B. A single circular DNA molecule in nucleoid region
- C. Many chromosomes in mitochondria
- D. RNA molecules in cytoplasm only
Answer: B. A single circular DNA molecule in nucleoid region
Prokaryotes have a nucleoid region containing a single circular DNA molecule, not a true nucleus.
Prokaryotes have a nucleoid region containing a single circular DNA molecule, not a true nucleus.
A student observes a cell with no nuclear membrane, no mitochondria, and no endoplasmic reticulum. The cell is most likely:
- A. A mature plant cell
- B. A bacterial cell
- C. An animal nerve cell
- D. A fungal cell
Answer: B. A bacterial cell
Bacterial cells are prokaryotic and lack membrane-bound organelles and a nuclear membrane.
Bacterial cells are prokaryotic and lack membrane-bound organelles and a nuclear membrane.
Which of the following pairs is correctly matched?
- A. Smooth ER — protein synthesis
- B. Ribosome — lipid synthesis
- C. Rough ER — protein synthesis
- D. Mitochondria — storage of genetic material only
Answer: C. Rough ER — protein synthesis
Rough ER is associated with ribosomes and is involved in protein synthesis, while smooth ER mainly helps in lipid synthesis.
Rough ER is associated with ribosomes and is involved in protein synthesis, while smooth ER mainly helps in lipid synthesis.
Which of the following statements is correct about prokaryotic cells?
- A. They possess a nuclear envelope and several linear chromosomes
- B. They lack membrane-bound organelles but have 70S ribosomes
- C. They always have mitochondria for respiration
- D. They have a well-developed Golgi apparatus
Answer: B. They lack membrane-bound organelles but have 70S ribosomes
Prokaryotic cells lack membrane-bound organelles and contain 70S ribosomes, which are smaller than eukaryotic ribosomes.
Prokaryotic cells lack membrane-bound organelles and contain 70S ribosomes, which are smaller than eukaryotic ribosomes.
A student says, 'Ribosomes are membrane-bound because they are found on rough ER.' Which is the best correction?
- A. Correct, because ribosomes are part of the ER membrane
- B. Incorrect, because ribosomes are attached to ER surface but are not membrane-bound themselves
- C. Correct, because all organelles in cytoplasm are membrane-bound
- D. Incorrect, because rough ER lacks ribosomes
Answer: B. Incorrect, because ribosomes are attached to ER surface but are not membrane-bound themselves
Ribosomes may be attached to rough ER, but they do not have a surrounding membrane and are non-membranous structures.
Ribosomes may be attached to rough ER, but they do not have a surrounding membrane and are non-membranous structures.