The Nobel Prize in Physics 2022 was awarded to three scientists—Alain Aspect, John F. Clauser, and Anton Zeilinger—for their pioneering work in the field of quantum mechanics, specifically for their experiments with entangled photons and their contributions to the understanding of quantum entanglement and quantum information science.

The G20 Summit 2023 in India adopted the theme “One Earth-One Family-One Future” (in Sanskrit, “Vasudhaiva Kutumbakam”). This theme reflects the concept of global unity and shared responsibility, emphasizing the interconnectedness of all nations and people in facing global challenges such as climate change, sustainable development, and inclusive growth.

• Citric acid – Lemon: This pair is correct. Citric acid is found in citrus fruits like lemons and oranges.
• Lactic acid - Sour milk: This pair is also correct. Lactic acid is present in sour milk and dairy products as a result of fermentation.
• Oxalic acid - Ant sting: This is incorrect. Oxalic acid is found in certain plants like spinach and rhubarb, not in ant stings. Ant stings actually contain formic acid (methanoic acid), which is responsible for the stinging sensation.
• Methanoic acid - Nettle sting: This pair is correct. Methanoic acid (formic acid) is found in nettle stings and is what causes the stinging and burning sensation when touched.

The pericarp is not a part of the flower; it is a part of the fruit. The pericarp is the part of the fruit that develops from the ovary after fertilization and surrounds the seeds. It can have three layers: the exocarp (outer layer), mesocarp (middle layer), and endocarp (inner layer).

An oligopoly is a market structure in which a few large firms dominate the market. These firms have significant control over pricing and supply, but they are interdependent, meaning the actions of one firm can influence the actions of the others. Due to the limited number of firms, they often engage in strategic planning and competitive tactics.