DDT (dichlorodiphenyltrichloroethane) is a synthetic pesticide once widely used to control insect-borne diseases like malaria. Its environmental persistence and harmful effects led to bans in many countries.
Tiwari Academy Discussion Latest Questions
Fruits are mature ovaries of flowering plants, containing seeds. They develop from fertilized ovaries and serve as a means for seed dispersal. Fruits come in various types, shapes, and flavors.
The pancreas is an organ in the digestive and endocrine systems. It produces digestive enzymes for breaking down food in the small intestine and releases insulin and glucagon to regulate blood sugar.
A food chain depicts the transfer of energy in an ecosystem. It starts with producers (plants), followed by herbivores (primary consumers) and carnivores (secondary and tertiary consumers), illustrating the feeding relationships.
Ozone is a molecule composed of three oxygen atoms. It forms a protective layer in Earth’s stratosphere, blocking harmful ultraviolet radiation. Ground-level ozone is a component of smog and can be harmful to health.
Herbivores are animals that primarily consume plants, while carnivores are meat-eating animals that primarily feed on other animals. Their dietary preferences are adapted to the types of food they consume.
The small intestine is a vital organ in digestion, where nutrients from food are absorbed into the bloodstream. It consists of the duodenum, jejunum, and ileum, playing a key role in nutrient absorption.
Veins are blood vessels that carry deoxygenated blood back to the heart. They have thinner walls than arteries and often contain valves to prevent blood from flowing backward.
Lenses refract light, converging (convex) or diverging (concave) based on shape. They produce real or virtual images, affecting magnification and focus. Commonly used in cameras, eyeglasses, and microscopes.
A concave mirror curves inward and reflects light. It converges parallel rays to a focal point, enabling real or virtual image formation. Used in applications like makeup mirrors and telescopes.