NEET Biology Structural Organisation in Animals MCQs Set 13

Answer: (b) Vascular/fluid

Explanation:
1. The correct option is (2) Vascular/fluid.
2. Fluid connective tissue (blood) is made of fibre free fluid matrix and specialised living cells that do not secrete fluid matrix. The fluid component of vascular tissue is derived from extracellular fluid.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Vascular/fluid.

Answer: (b) Ligament

Explanation:
1. The correct option is (2) Ligament.
2. Sprain is injury in joint in which some of fibres of supporting ligaments are ruptured through continuity of ligament and its binding to two bones remain intact. (Muscular Tissue).

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Ligament.

Answer: (b) (b) & (c)

Explanation:
1. The correct option is (2) (b) & (c).
2. Skeletal muscle (striated or striped muscle) – Voluntary muscle, e.g. movement of arms, legs etc. Smooth muscle (unstriped or non-striated muscle) – Involuntary muscle e.g. posterior part of oesophagus, stomach, intestine, blood vessels Cardiac muscle – Involuntary muscle e.g. cardiac muscle in wall of heart.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. Check every option separately before choosing a combined answer.

Answer: (c) Peripherally

Explanation:
1. The correct option is (3) Peripherally.
2. Skeletal/striated muscle fibers are long cylindrical unbranched fibers. These fibers are multinucleated and their nuclei are peripheral in position.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Peripherally.

Answer: (c) Cardiac muscles

Explanation:
1. The correct option is (3) Cardiac muscles.
2. Intercalated discs are unique and distinguishing feature of cardiac muscle. They are dark, irregular zig-zag partitions between adjacent cardiac muscle cells. They have both transverse and lateral portions. Intercalated disc provide firm adhesions between adjacent cells, electrical coupling for spread of excitation as well as contraction.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Cardiac muscles.

Answer: (b) Smooth

Explanation:
1. The correct option is (2) Smooth.
2. Smooth muscles (non-striated muscles) help in bringing about involuntary movement in body such as peristalsis (movement of food in alimentary canal). These muscles are found in posterior part of oesophagus, stomach and intestine which undergo peristaltic movement in gastrointestinal tract.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Smooth.

Answer: (a) Striated and involuntary

Explanation:
1. The correct option is (1) Striated and involuntary.
2. Cardiac myofibrils have transverse faint dark and light bands, which alternate with each other. Cardiac muscles are involuntary muscles.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Striated and involuntary.

Answer: (b) Cardiac muscles

Explanation:
1. The correct option is (2) Cardiac muscles.
2. Gap junctions allow molecules and ions to pass freely between cells. Cardiac muscles are auto-rhythmic. Intercalated discs are located between cardiac muscle cells. They contain gap junctions which provide channels between cells. The intercalated disc allows waves of depolarisation to sweep across cells thus synchronising muscle contraction.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Cardiac muscles.

Answer: (d) Muscles

Explanation:
1. The correct option is (4) Muscles.
2. Muscles have contractile nature. The contractile structure of muscle cells are called myofibrils. Myofibrils are made of myofilaments. Myofilaments are of two types, myosin and actin. Contraction occurs due to sliding of actin filaments on myosin filaments. (Nervous Tissue).

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Muscles.

Answer: (a) Cyton

Explanation:
1. The correct option is (1) Cyton.
2. Nissl granules or Nissl bodies are present in cyton or cell body. Nissl bodies are basophilic structure of various shapes. They are pieces of granular endoplasmic reticulum with or without free polyribosomes. They aid in rapid synthesis of protein and enzymes required by neurons.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Cyton.

Answer: (b) Synapse

Explanation:
1. The correct option is (2) Synapse.
2. Synapse is an area of specialised junction between two neurons for transmission of impulse. Synapse between axon terminal of one and dendron terminal of another mode of neurotransmission across a synapse is chemical or electric.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Synapse.

Answer: (d) All of these

Explanation:
1. The correct option is (4) All of these.
2. Neuroglial cells are specialised cells found in brain and spinal cord supporting neurons. About more than 50% of all brain cells are neurolglial cells. These cells have different shapes and transmit impulse from one neuron to next neuron. Objective Type Questions (Epithelial Tissue).

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. Check every option separately before choosing a combined answer.

Answer: (c) Upper layer of the soil

Explanation:
1. The correct option is (3) Upper layer of the soil.
2. Earthworm is terrestrial animal found in wet soil. They usually live in burrows found in upper layer of soil.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Upper layer of the soil.

Answer: (c) Dark mid-dorsal line

Explanation:
1. The correct option is (3) Dark mid-dorsal line.
2. The dorsal surface of body in earthworm is recognised by a dark median line (mid-dorsal), which is dorsal blood vessel beneath skin. Their ventral surface can be recognised by presence of genital apertures.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Dark mid-dorsal line.

Answer: (d) Prostomium

Explanation:
1. The correct option is (4) Prostomium.
2. First segment on anterior end of mouth is peristomium (buccal segment). The dorsal edge of peristomium projects forward above the mouth as small fleshy lobe called 'Prostomium' which serve as covering for mouth. Prostomium is used as muscular probe in burrowing and sensory in function.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Prostomium.

Answer: (c) Spermathecal apertures

Explanation:
1. The correct option is (3) Spermathecal apertures.
2. There are four pairs of spermathecae apertures situated on ventro lateral sides of intersegmental grooves; i.e. 5th to 9th segments. They serve to receive sperms from another worm during copulation.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Spermathecal apertures.

Answer: (d) Cuticle

Explanation:
1. The correct option is (4) Cuticle.
2. Body wall of earthworm is covered externally by thin, non-cellular layer, secreted by epidermis below it.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Cuticle.

Answer: (c) Clitellar region

Explanation:
1. The correct option is (3) Clitellar region.
2. In mature worms, a prominent dark circular bond of glandular tissue is found from 14th to 16th segment. This is known as clitellum. Clitellum segment secretes material (i.e. mucus and albumen etc.) for formation of cocoon or egg capsule.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Clitellar region.

Answer: (a) 1st to 3rd segment

Explanation:
1. The correct option is (1) 1st to 3rd segment.
2. In earthworm mouth leads into thin-walled small tube called buccal cavity. It extends from first to middle of third segment.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: 1st to 3rd segment.

Answer: (c) Calciferous glands

Explanation:
1. The correct option is (3) Calciferous glands.
2. Stomach walls are highly vascular and glandular. In stomach walls, chalky secretion of calciferous glands neutralises humic acid present in humus.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Calciferous glands.

Answer: (b) Typhlosole

Explanation:
1. The correct option is (2) Typhlosole.
2. The characteristic feature of earthworm intestine between 26th to 95th segment is presence of internal median fold of dorsal wall called ‘Typhlosole’. This increases effective area of digestion and absorption in intestine.

Teacher's Note:
1. Link this question to the matching NCERT topic and revise it.
2. The point to remember: Typhlosole.