Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.

NEET-2021 Structural-Organisation-in-Animals [class-xi ]

• Gap junctions and Adhering junctions, respectively.
• Tight junctions and Gap junctions, respectively.
• Adhering junctions and Tight junctions, respectively.
• Adhering junctions and Gap junctions, respectively.
Correct Option: B  [ Tight junctions and Gap junctions, respectively. ]

Remark:

Following are the statements about prostomium of earthworm.
A. It serves as a covering for mouth.
B. It helps to open cracks in the soil into which it can crawl.
C. It is one of the sensory structures.
D. It is the first body segment.
Choose the correct answer from the options given below.

NEET-2021 Structural-Organisation-in-Animals [class-xi ]

• A, B and C are correct
• A, B and D are correct
• A, B, C and D are correct
• B and C are correct
Correct Option: A  [ A, B and C are correct ]

Remark:

Goblet cells of alimentary canal are modified from:

NEET-(Sept)2020 Structural-Organisation-in-Animals [class-xi ]

• Squamous epithelial cells
• Columnar epithelial cells
• Chondrocytes
• Compound epithelial cells
Correct Option: B  [ Columnar epithelial cells ]

Remark:

Cuboidal epithelium with brush border of microvilli is found in:

NEET-(Sept)2020 Structural-Organisation-in-Animals [class-xi ]

• lining of intestine
• ducts of salivary glands
• proximal convoluted tubule of nephron
• eustachian tube
Correct Option: C  [ proximal convoluted tubule of nephron ]

Remark:

If the head of cockroach is removed, it may live for few days because:

NEET-(Sept)2020 Structural-Organisation-in-Animals [class-xi ]

• the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.
• the cockroach does not have nervous system.
• the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.
• the head holds a 1/3^rd of a nervous system while the rest is situated along the dorsal part of its body.
Correct Option: C  [ the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body. ]

Remark:

In cockroach, identify the parts of the foregut in correct sequence :-

NEET-(Oct)2020 Structural-Organisation-in-Animals [class-xi ]

• Mouth → Oesophagus → Pharynx → Crop → Gizzard
• Mouth → Crop → Pharynx → Oesophagus → Gizzard
• Mouth → Gizzard → Crop → Pharynx → Oesophagus
• Mouth → Pharynx → Oesophagus → Crop → Gizzard
Correct Option: D  [ Mouth → Pharynx → Oesophagus → Crop → Gizzard ]

Remark:

Match the following columns with reference to cockroach and select the correct option:

NEET-(Oct)2020 Structural-Organisation-in-Animals [class-xi ]

• (A)-(III), (B)-(I), (C)-(IV), (d)-(II)
• (A)-(IV), (B)-(III), (C)-(V), (d)-(II)
• (A)-(I), (B)-(IV), (C)-(III), (d)-(II)
• (A)-(II), (B)-(III), (C)-(I), (d)-(IV)
Correct Option: A  [ (A)-(III), (B)-(I), (C)-(IV), (d)-(II) ]

Remark:

The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in:

NEET-2019 Structural-Organisation-in-Animals [class-xi ]

• Bronchioles and Fallopian tubes
• Bile duct and Bronchioles
• Fallopian tubes and Pancreatic duct
• Eustachian tube and Salivary duct
Correct Option: A  [ Bronchioles and Fallopian tubes ]

Remark:

Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth:

NEET-2019 Structural-Organisation-in-Animals [class-xi ]

• Pharynx → Oesophagus → Gizzard → Crop → Ileum → Colon → Rectum
• Pharynx → Oesophagus → Gizzard → Ileum → Crop → Colon → Rectum
• Pharynx → Oesophagus → Ileum → Crop → Gizzard → Colon → Rectum
• Pharynx → Oesophagus → Crop → Gizzard → Ileum → Colon → Rectum
Correct Option: D  [ Pharynx → Oesophagus → Crop → Gizzard → Ileum → Colon → Rectum ]

Remark:

In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on:

NEET-2024 Structural-Organisation-in-Animals [class-xi ]

• 10^th segment
• 5^th segment
• 11^th segment
• 8^th and 9th segment
Correct Option: A  [ 10^th segment ]

Remark: