Tear contains an anti-bacterial enzyme called-

Correct Answer: D

Rationale: The correct answer is D: Lysozyme. Lysozyme is an anti-bacterial enzyme found in tears that helps protect the eyes from infections. It works by breaking down the cell walls of bacteria, thus preventing their growth. Lacrimin (A) is a protein involved in tear production, not an anti-bacterial enzyme. Interferon (B) is a protein produced by the immune system to fight viruses, not found in tears. Pepsin (C) is a digestive enzyme produced in the stomach, not present in tears. Therefore, the correct answer is D because lysozyme is the specific anti-bacterial enzyme found in tears.

Correct Answer: D

Rationale: The long and hard hairs on a rabbit's upper lip, known as whiskers, serve multiple purposes. Firstly, they provide tactile stimulation by helping the rabbit sense its surroundings. Secondly, they aid in pressure stimulation, helping the rabbit navigate through tight spaces. Finally, they play a role in temperature stimulation by detecting changes in the environment. Therefore, the correct answer is D, "All of the above," as whiskers serve all these functions. Choices A, B, and C are incorrect because they each represent only one aspect of the whiskers' function, while the correct answer encompasses all of them.

Correct Answer: A

Rationale: The correct answer is A: Unstriped arrector pili muscles. These muscles are attached to the hair follicles in the dermis. They contract in response to stimuli like cold or fear, causing the hair to stand up (goosebumps). Choice B, "Goose flesh," is a sensory response caused by the contraction of arrector pili muscles, not the attachment itself. Choices C and D, Vibrissae and Panniculus adiposus, are not directly involved in the attachment of hair follicles in the dermis.

Correct Answer: C

Rationale: Rationale: Taxidermy involves preserving the whole skin (epidermis and dermis) using chemicals to maintain the lifelike appearance of an animal. Albinism is a genetic condition causing lack of pigmentation. Toxicology is the study of the adverse effects of chemicals on living organisms. Tanning is a process of treating animal hides to produce leather, not preserving the whole skin.

Correct Answer: D

Rationale: The correct answer is D: Stratum corneum of the skin. Nails, claws, horns, and hooves in mammals are produced by keratinized structures in the epidermis called the stratum corneum. This specialized layer of the skin is responsible for forming these protective structures. Cartilage (A) is not involved in the production of these structures. Bone (B) is part of the skeletal system and not directly responsible for the formation of nails, claws, horns, or hooves. Muscles of the skin (C) are involved in movement and expression but do not produce these particular structures. Therefore, the correct answer is D as it directly relates to the formation of nails, claws, horns, and hooves in mammals.