Biology

Elephants have the longest gestation period among land animals, lasting about 640 to 660 days (approximately 95 weeks). This is significantly longer than other land mammals, making option B correct.

Hepatitis C is a viral infection that primarily affects the liver and is a leading cause of chronic liver disease, including cirrhosis and liver cancer. It is not related to HIV, diabetes, or AIDS.

The hypothalamus is the part of the brain responsible for regulating thirst and hunger by maintaining homeostasis and controlling the release of hormones related to these drives.

Botany is the scientific study of plants, and it is also known as Phytology. Phycology is the study of algae, Pedology is the study of soils, and Plantophyta is not a correct term for botany.

Earthworms do not have eyes; instead, they sense light and vibrations through their skin. Therefore, the correct answer is that earthworms have no eyes.

Leukocytes, or white blood cells, are responsible for protecting the body against infectious diseases and foreign invaders by identifying and destroying pathogens. Red blood cells carry oxygen, while the endoplasmic reticulum and Golgi apparatus are cellular organelles involved in protein and lipid processing, not immune defense.

Tropism is the growth response of a plant in a particular direction due to an external stimulus, such as light or gravity, making option B correct.

The pancreas functions as both an endocrine gland by secreting hormones like insulin into the bloodstream, and as an exocrine gland by producing digestive enzymes released into the small intestine. The thyroid and parathyroid glands are solely endocrine glands.

Vitamin C is a water-soluble vitamin that cannot be stored in the human body in significant amounts, unlike fat-soluble vitamins such as vitamin D and K which can be stored in body fat and liver. Therefore, vitamin C must be regularly consumed in the diet.

Trypsin is a protein-digesting enzyme produced by the pancreas, not the stomach. It is secreted into the small intestine where it helps break down proteins.