Assertion Reason Test: Structural Organisation in Animals - NEET MCQ

A: The nucleus of a plasma cell has cartwheel appearance.

R: Nucleus contains peripheral clumps of heterochromatin.

A: Yellow bone marrow is reserved for erythropoietic tissue.

R: After severe bleeding, yellow marrow may convert to red marrow.

A: The cells that produce and secrete fibres are called fibroblasts.

R: Fibroblasts are the characteristic cells of all types of connective tissue.

A: Gap junctions connect the cytoplasm of adjoining cells.

R: Gap junctions facilitate the cells to communicate with each other.

A: Intercellular material is minimum between the cells of epithelial tissue.

R: Epithelial cells are not secretory in nature.

A: Smooth muscle fibres are unstriated, fusiform and uninucleate.

R: These cells are involuntary in function.

A: The inner lining of trachea, bronchi and fallopian tubes has simple epithelium with non-motile cilia.

R: Cilia form the brush-border.

A: In cockroaches, inspiration is an active process.

R: It is due to the contraction of tergosternal muscle.

A: In frogs, sinus-venosus is present.

R: In mammals and birds, the remnant of sinus venosus has taken part in the formation of the SA node.

A: Septal nephridia take part in osmoregulation.

R: They are enteronephric.

A: In Periplaneta, only superposition or overlapping images are formed.

R: Retinal pigment sheath remains contracted throughout life.

A: Pharyngeal gland of earthworm includes chromophil cells, which secrete enzymes.

R: Salivary amylase of earthworm is essential to digest carbohydrates.

A: In cockroach, each segment is covered by three hardened plates called sclerites.

R: These sclerites are dorsal tergite, ventral sternite and lateral pleurite.

A: During copulation, two earthworms mutually exchange sperms.

R: The sperms are stored temporarily in the spermathecae.

A: Typhlosole is the characteristic dorsal median fold in the intestine of earthworm.

R: Typhlosole secretes intestinal juice containing digestive enzymes.

A: Male frogs have copulatory/nuptial pad on the pollex of forelimbs.

R: It helps in amplexus.

A: Urine, faeces and gametes pass through a common passage in frogs.

R: Frogs have cloaca in which alimentary canal and urinogenital ducts open.