Consider statements about biotechnology: 1. DNA fingerprinting is used in forensics. 2. Insulin was the first genetically engineered human hormone. 3. Bt brinjal is resistant to herbicides. Which are correct? MCQ with Answer and Explanation

Explanation:
Scoliodon is a cartilaginous fish (Chondrichthyes), possessing a cartilaginous endoskeleton, placoid scales, and ventral mouth. Rohu and Catla are bony fishes (Osteichthyes). Hippocampus is also a bony fish. Chondrichthyes include sharks, rays, and skates. They lack an air bladder and have to swim constantly to avoid sinking.

Explanation:
Defecation is the elimination of undigested solid waste (feces) from the rectum. Urination removes liquid nitrogenous waste, exhalation removes CO₂ and water vapor, secretion is release of useful substances.

Explanation:
Essential fatty acids are polyunsaturated fats that the human body lacks the enzymes to synthesize, so they must be consumed in the diet. The two primary essential fatty acids are linoleic acid (an omega-6 fatty acid) and alpha-linolenic acid (an omega-3 fatty acid). They are precursors for other important lipids like arachidonic acid and are crucial for cell membrane structure and eicosanoid synthesis. Palmitic and stearic are saturated fats.