Cell: The Unit of Life Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of junction allows the transfer of ions and small molecules between adjacent animal cells?

Tight junction
Desmosome
Gap junction
Plasmodesmata
3

Gap junctions are protein channels that allow ions and small molecules to pass between adjacent animal cells, facilitating communication.

What is the role of microtubules in eukaryotic cells?

Cell motility
Spindle fiber formation
Cell adhesion
Lipid synthesis
2

Microtubules form spindle fibers during cell division to separate chromosomes (NCERT, Chapter 8, page 138). Cell motility involves microfilaments, adhesion involves junctions, and lipid synthesis occurs in the smooth ER.

Which structure in plant cells is responsible for photosynthesis?

Chromoplast
Chloroplast
Amyloplast
Elaioplast
2

Chloroplasts contain chlorophyll and are responsible for photosynthesis in plant cells (NCERT, Chapter 8, page 135). Chromoplasts store pigments, amyloplasts store starch, and elaioplasts store oils.

Which of the following statements about plastids is incorrect?

Plastids are found in plant cells.
Amyloplasts store starch.
Chromoplasts are responsible for photosynthesis.
Chloroplasts contain chlorophyll.
3

Chloroplasts, not chromoplasts, are responsible for photosynthesis. Chromoplasts store pigments that give color to fruits and flowers.

Which of the following statements about the plasma membrane is correct?

The plasma membrane is permeable to all molecules.
The plasma membrane is made of a phospholipid bilayer with embedded proteins.
The plasma membrane produces enzymes for digestion.
The plasma membrane is composed of only proteins.
2

The plasma membrane is composed of a phospholipid bilayer with embedded proteins, making it selectively permeable.

Which organelle is responsible for the synthesis of ribosomes?

Nucleus
Nucleolus
Golgi apparatus
Endoplasmic reticulum
2

The nucleolus, located inside the nucleus, is the site for ribosomal RNA synthesis and ribosome assembly.

Which of the following is correct about vacuoles?

Vacuoles are absent in plant cells.
Vacuoles help in maintaining turgor pressure.
Vacuoles synthesize proteins.
Vacuoles are only found in animal cells.
2

Vacuoles in plant cells help maintain turgor pressure, providing structural support to the plant.

Which of the following statements about endoplasmic reticulum (ER) is correct?

The rough ER is involved in protein synthesis.
The smooth ER produces ribosomes.
The rough ER stores genetic information.
The smooth ER is involved in photosynthesis.
1

The rough endoplasmic reticulum (RER) is studded with ribosomes and is involved in protein synthesis.

Which of the following is incorrect about centrioles?

Centrioles are involved in the formation of spindle fibers during cell division.
Centrioles are composed of microtubules.
Centrioles are found in both plant and animal cells.
Centrioles help in organizing microtubules.
3

Centrioles are found in animal cells but are usually absent in higher plant cells.

Which type of plastid is responsible for storing starch?

Chloroplast
Chromoplast
Amyloplast
Elaioplast
3

Amyloplasts store starch in plant cells, especially in storage tissues like potato tubers.

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