Cell: The Unit of Life Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is incorrect about peroxisomes?

Peroxisomes help in the breakdown of fatty acids.
Peroxisomes produce hydrogen peroxide as a by-product.
Peroxisomes are involved in cellular respiration.
Peroxisomes contain catalase to break down hydrogen peroxide.
3

Peroxisomes are not involved in cellular respiration; they are involved in fatty acid breakdown and detoxification processes.

Which of the following is incorrect about cilia and flagella?

Cilia and flagella are involved in cell movement.
Both cilia and flagella have a 9+2 arrangement of microtubules.
Cilia are usually longer and fewer than flagella.
Flagella are used for the movement of sperm cells in animals.
3

Cilia are usually shorter and more numerous than flagella, which are longer and fewer in number.

Which of the following is incorrect about mitochondria?

Mitochondria are known as the powerhouse of the cell.
Mitochondria have their own DNA.
Mitochondria produce ribosomes.
Mitochondria are involved in cellular respiration.
3

Mitochondria do not produce ribosomes; they produce ATP through cellular respiration.

Which cell organelle is responsible for packaging materials to be delivered inside or outside the cell?

Lysosome
Golgi apparatus
Mitochondrion
Ribosome
2

The Golgi apparatus modifies and packages materials for intracellular and extracellular transport.

Which type of ribosomes are found in mitochondria?

70S
80S
60S
50S
1

Mitochondria contain 70S ribosomes, similar to prokaryotic cells, which supports the endosymbiotic theory.

Which of the following statements about lysosomes is incorrect?

Lysosomes contain hydrolytic enzymes for intracellular digestion.
Lysosomes are formed from the Golgi apparatus.
Lysosomes are responsible for photosynthesis.
Lysosomes help in autophagy (self-digestion of cell components).
3

Lysosomes are not involved in photosynthesis; they break down cellular waste and damaged organelles.

Which of the following is correct about the nucleus?

The nucleus is present in prokaryotic cells.
The nucleus contains chromatin, which is made of DNA and proteins.
The nucleus produces lipids.
The nucleus is responsible for cellular respiration.
2

The nucleus contains chromatin, which is a complex of DNA and proteins responsible for storing genetic information.

Which type of cell junction prevents leakage of substances between animal cells?

Gap junction
Tight junction
Desmosome
Plasmodesmata
2

Tight junctions form a seal between animal cells, preventing leakage of substances across tissues (NCERT, Chapter 8, page 129). Gap junctions allow communication, desmosomes provide adhesion, and plasmodesmata are plant-specific.

Which structure of the chloroplast is responsible for trapping light energy?

Stroma
Grana
Inner membrane
Plasmodesmata
2

Grana are stacks of thylakoids that contain chlorophyll, which traps light energy for photosynthesis.

Which of the following statements is NOT a part of the modern cell theory?

All living organisms are composed of cells.
Cells arise from pre-existing cells.
Cells can spontaneously generate under specific conditions.
Cells are the fundamental unit of life.
3

Cell theory states that all cells arise from pre-existing cells; spontaneous generation has been disproved.

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