NEET Practice Questions (MCQs) with Answers & Solutions

Peroxisomes are cell organelles that contain both oxidase and catalase enzymes. Oxidases are involved in the oxidation of substances, using oxygen to form hydrogen peroxide. Catalase then breaks down hydrogen peroxide into water and oxygen, protecting the cell from oxidative damage.

The distal segment of the walking leg of a cockroach is called the Tarsus. The leg of a cockroach is divided into five segments: Coxa, Trochanter, Femur, Tibia, and Tarsus. The Tarsus is the last segment and is involved in walking and gripping surfaces.

The three main layers of the body wall of a cockroach from outer to inner side are arranged as Cuticle, Epidermis, and Basement membrane. The cuticle is the outermost layer that provides protection, the epidermis is the middle layer containing living cells, and the basement membrane is the innermost layer providing structural support.

Epidermis of body wall of cockroach is made up of columnar epithelium.

In cockroaches, the foregut and hindgut are lined with a cuticle. This cuticle protects the internal lining of the gut and helps in the mechanical breakdown of food.

In the alimentary canal of a cockroach, the region following the mouth is narrow tubular. This region, known as the esophagus, connects the mouth to the crop and facilitates the passage of food.

Each salivary gland of a cockroach has two secreting lobes. These lobes produce saliva which aids in the initial digestion of food.

The crop in the alimentary canal of a cockroach is a part of the foregut and is located at the posterior end of the oesophagus. This structure serves as a storage area for food before it moves into the gizzard for grinding.

In cockroaches, the gizzard is a muscular organ that contains six chitinous teeth. These teeth help in grinding the food into smaller particles, making it easier for digestion in the midgut.