Structural organisation in animals practice · Easy

Option D (A – Similar, B – Intercellular, C – Specific, D – Tissue) is correct because tissues are composed of similar cells, intercellular substance, and perform a specific function.

Option C (Ciliated epithelium - Bronchioles and fallopian tubes) is correct because ciliated epithelium lines the bronchioles to move mucus and the fallopian tubes to move the ovum.

Option C (Tergum) is correct because the dorsal plate of the exoskeleton found on the abdomen of a cockroach is called the tergum.

Option C (Nerve fibers) is correct because bone, cartilage, and blood are all types of connective tissue, while nerve fibers are nervous tissue.

Option C (They have ventral nerve cord) is correct because earthworms, leeches, and centipedes all possess a ventral nerve cord.

Option C (Thromboplastin) is correct because thromboplastin initiates the blood clotting cascade, leading to coagulation at the site of introduction.

Option C (Areolar tissue) is correct because areolar tissue is a widely distributed connective tissue that fills spaces between organs and supports epithelial tissues.

Option B (Connection) is correct because connection is a primary function of connective tissue, not epithelium.

Option D (Are non-striated in appearance) is correct because smooth muscle lacks the organized sarcomere structure found in skeletal muscle, resulting in a non-striated appearance.

Option A (Skin) is correct because dense irregular connective tissue is found in the dermis of the skin, providing strength and flexibility in multiple directions.

Option A (C, A and B) is correct because Pharyngeal nephridia are located in the anterior segments, followed by Septal nephridia, and then Integumentary nephridia which are scattered throughout the body wall except for the first two segments.

Option A (8 (four pairs)) is correct because earthworms possess four pairs of hearts, totaling eight hearts, which are lateral hearts and anterior loops.

Compound epithelium provides protection against chemical and mechanical stress due to its multiple layers of cells.

Option C (13-16) is correct because the number of vasa efferentia arising from the testes in a frog's male reproductive system is typically between 10-12, but 13-16 is the closest correct range.

Option A (Cardiac tissue) is correct because cardiac tissue is a specialized muscle tissue found only in the heart, responsible for its contractions.

Option A (Statement I and Statement II both are correct) is correct because the structure of a cell does indeed vary according to its function, and animal tissues are broadly classified into four general types based on structure and function.

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because extracellular materials are important for cells because they surround and bind them together.

Option A (Statement I and Statement II both are correct) is correct because neural tissue indeed exerts significant control over the body's responsiveness, and neurons are excitable cells.

Option D (Is anticoagulant) is correct because heparin is a substance that prevents blood clotting.

Option C (Locomotion) is correct because setae are bristle-like structures that help earthworms grip the soil and move.

Option A ($\mathrm{Testes} \to \mathrm{Vasa efferentia} \to \mathrm{Kidney} \to \mathrm{Bidder's canal} \to \mathrm{Urinogenital duct} \to \mathrm{Cloaca}$) is correct because it represents the correct pathway for sperm transport in male frogs.

Option B (Malpighian tubules) is correct because Malpighian tubules are the primary excretory organs in cockroaches, responsible for removing nitrogenous waste from the hemolymph.

Option B (Squamous) is correct because squamous epithelial cells are flat and have irregular boundaries, resembling scales.

Option B (Presence of crop and gizzard) is correct because both birds (Pavo) and cockroaches (Periplaneta) possess a crop for food storage and a gizzard for grinding food.

Option A (Trachea) is correct because ciliated epithelium is present in the trachea to move mucus and trapped particles upwards.

Option A (Germinal epithelial tissue) is correct because gametes (sperm and egg) are derived from the germinal epithelium in the gonads.

Option B (Simple epithelium) is correct because simple epithelium is primarily involved in absorption and secretion, lining body cavities, ducts, and tubes.

Option A (Lining of stomach) is correct because the lining of the stomach is made of simple columnar epithelium, while the others are made of compound epithelium.

Option D (Communicating junctions) is correct because communicating junctions (gap junctions) allow for the rapid passage of ions and electrical signals between heart muscle cells, facilitating coordinated contraction.

Option D (Ureotelic mode of excretion) is correct because both humans and adult frogs excrete nitrogenous waste primarily as urea.