Biology

Bamboo is classified as a type of grass because it belongs to the Poaceae family, which is the grass family. Despite its woody appearance, it is not a tree or shrub.

Segmented worms, such as earthworms, breathe through their moist skin, which allows the exchange of gases directly with the environment. They do not have lungs, mouths, or noses for respiration.

Vitamin C deficiency causes scurvy, a disease characterized by symptoms like bleeding gums and weakness. The other options are unrelated to vitamin C deficiency.

Bioluminescence is the term used to describe the emission of light by living organisms, such as fireflies and certain marine animals. The other options do not specifically refer to light emission by living organisms.

The adult human brain typically weighs about 2% of the total body weight, which is a well-established fact in human biology and anatomy.

Osmoregulation in humans is primarily carried out by the kidneys, which regulate the balance of water and electrolytes in the body by filtering blood and producing urine.

The average human brain weighs approximately between 1.2 to 1.4 kilograms, which corresponds to option A. Other options list weights that are significantly higher than the typical brain weight.

White blood cells are called the 'soldiers' of the body because they defend the body against infections and foreign invaders, playing a crucial role in the immune system.

AB- is the rarest blood type among the common ABO and Rh blood groups, occurring in less than 1% of the population, making it rarer than O-, O+, and AB+.

Inhaled air passes through the larynx, pharynx, trachea, and finally reaches the bronchioles last before entering the alveoli for gas exchange. Therefore, the bronchiole is the last structure among the options through which air passes.

Oncology is the branch of medicine that specializes in the study and treatment of cancer. Therefore, the correct answer is 'Cancer'.

The cerebrum is the largest part of the human brain, responsible for higher brain functions such as thought and action. The cerebellum, brainstem, and pituitary gland are smaller parts with different functions.

During a total solar eclipse, sunlight is temporarily blocked, causing a significant decrease in light intensity. Since photosynthesis depends on light, its rate decreases, while respiration continues unaffected. Therefore, a decrease in the rate of photosynthesis is most likely.

Ichthyology is the branch of zoology that deals with the study of fish. Entomology is the study of insects, and ecology is the study of interactions between organisms and their environment.

Nitrogen is a key element in proteins, which are essential components of plants and animals. Proteins contain nitrogen in their amino acid structures, unlike minerals, fats, or carbohydrates which do not contain nitrogen as a primary element.

Entomology is the branch of zoology that deals specifically with the study of insects, making option B the correct answer. Ichthyology is the study of fish, zoology is the broader study of animals, and botany is the study of plants.

White blood cells are also called leucocytes, which are part of the immune system and help fight infections. Thrombocytes are platelets involved in blood clotting, and erythrocytes are red blood cells that carry oxygen.

The average weight of a human heart is approximately 300 to 350 grams, with 350 grams being a commonly accepted average for adults. This makes option B the most accurate choice.

Multiple authoritative sources, including sonographic studies and anatomical references, indicate that the average length of an adult human kidney is approximately 10 to 11 cm, typically ranging from about 10 to 13 cm. This range fits best with option C (10 cm to 13 cm). The originally marked option B (8 cm to 10 cm) is slightly below the average kidney length reported in healthy adults. Therefore, option C is the most accurate choice based on current medical literature.

A frog's heart has three chambers: two atria and one ventricle. This structure allows some mixing of oxygenated and deoxygenated blood, which is characteristic of amphibians.

Typhus is a disease transmitted by fleas, specifically the body louse flea, whereas smallpox, tetanus, and yellow fever are not spread by fleas. This makes option C the correct answer.

The hypothalamus is the part of the brain responsible for regulating body temperature by maintaining homeostasis through various mechanisms such as sweating and shivering.

Dolphins use both sight and sound to perceive their environment. They have good vision underwater and rely heavily on echolocation (sound) to navigate and find prey.

Theophrastus is widely regarded as the Father of Botany because he was the first to systematically study and write about plants and their classification. His works laid the foundation for the science of botany.

Fishes primarily excrete nitrogenous waste in the form of ammonia, which is highly soluble in water and can be easily eliminated through their gills and urine. This is typical for aquatic animals that live in water-rich environments.