Sample 1Easy
Which of the following is an example of loose connective tissue?
- A
Areolar tissue
- B
Tendon
- C
Ligament
- D
Cartilage
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The answer is A.Loose connective tissue has cells and fibres loosely arranged in a semi-fluid ground substance; areolar tissue and adipose tissue are its examples. Tendons and ligaments are dense regular connective tissue, and cartilage is a specialised connective tissue.
- B.
A tendon is dense regular connective tissue attaching skeletal muscle to bone.
- C.
A ligament is dense regular connective tissue attaching one bone to another.
- D.
Cartilage is a specialised connective tissue.
NCERT: Class 11 Biology, Chapter 7 (Structural Organisation in Animals), Animal Tissues, Connective Tissue
Sample 2Medium
A figure shows an epithelium made of a single layer of tall, slender cells resting on a basement membrane, with their nuclei near the base. The free surface of every cell bears many short, hair-like projections. Which option names this tissue and a site where it is found?
- A
Squamous epithelium; the walls of blood vessels
- B
Ciliated columnar epithelium; the walls of the air sacs of the lungs
- C
Ciliated columnar epithelium; the inner surface of the fallopian tubes
- D
Compound epithelium; the inner lining of the buccal cavity
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The answer is C.A single layer of tall cells is columnar epithelium, and cells with cilia on their free surface form ciliated epithelium. It moves particles or mucus in one direction, and lines the bronchioles and the fallopian tubes.
- A.
Squamous epithelium is a single layer of thin, flat cells with irregular boundaries, not tall cells with cilia.
- B.
The air sacs of the lungs are lined by squamous epithelium. Ciliated epithelium lines hollow organs such as the bronchioles and fallopian tubes.
- D.
Compound epithelium has many layers of cells, whereas the figure shows a single layer of tall cells bearing cilia.
NCERT: Class 11 Biology, Chapter 7
Sample 3NEET level
Which type of cell junction helps to stop substances from leaking across a tissue?
- A
Tight junctions
- B
Adhering junctions
- C
Gap junctions
- D
Intercalated discs
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The answer is A.Tight junctions help to stop substances from leaking across a tissue. Adhering junctions cement neighbouring cells together, and gap junctions connect the cytoplasm of adjoining cells so that they can communicate.
- B.
Adhering junctions cement neighbouring cells together.
- C.
Gap junctions let ions, small molecules and sometimes big molecules pass between cells.
- D.
Intercalated discs are the communication junctions between cardiac muscle cells that let them contract as a unit.
NCERT: Class 11 Biology, Chapter 7 (Structural Organisation in Animals), Animal Tissues – Epithelial Tissue