All Free Everyday Science MCQs with Answers

761. Name the animal which can live without water in its entire life?

• A. Desert lizard
• B. Camel
• C. Kangaroo rat
• D. Cuttlefish

Explanation: The kangaroo rat can live without drinking water because it obtains water from seeds and produces additional metabolic water during respiration. Camels conserve water efficiently, but they still drink water when it is available.

762. Hyetology is the study of__________?

• A. High pressure
• B. Rainfall
• C. High temperature
• D. Earthquake

Explanation: Hyetology is the study of precipitation, especially rainfall, including its amount and distribution. The other options concern pressure, temperature or earthquakes rather than precipitation.

763. "Green House Effect" means:____________?

• A. Pollution
• B. Prevention of ultraviolet rays
• C. Trapping of Solar energy due to atmospheric carbon dioxide
• D. D. None

Explanation: The greenhouse effect occurs when gases such as carbon dioxide absorb and re-radiate outgoing infrared heat, warming the lower atmosphere. It is not the prevention of ultraviolet rays.

764. Tropism mostly refers to as_______?

• A. Bird migration
• B. Directional growth of a plant
• C. Longevity of animal species
• D. Behavioral pattern of human

Explanation: Tropism is the directional growth of a plant in response to a stimulus, such as light or gravity. For example, a shoot bends toward light in phototropism.

765. A seed can germinate in the absence of__________?

• A. Oxygen
• B. Light
• C. Moisture
• D. Temperature

Explanation: Many seeds can germinate in darkness because light is not generally required for the initial stages of germination. Oxygen, adequate moisture, and a suitable temperature are normally essential.

766. Which of these is a micronutrient of plants?

• A. Oxygen
• B. Nitrogen
• C. Boron
• D. Carbon

Explanation: Boron is a plant micronutrient needed only in very small quantities. Nitrogen, carbon, and oxygen are required in much larger amounts and are classified as macronutrients or structural elements.

767. An example of rhizome is_________?

• A. Carrot
• B. Tomato
• C. Ginger
• D. Garlic

Explanation: Ginger is a rhizome, a horizontally growing underground stem with nodes and buds. Carrot is a root, while tomato is a fruit and garlic is a bulb.

768. Which of the following organisms releases molecular oxygen into water?

• A. E.coli
• B. Phytoplankton
• C. Amoeba
• D. Salmonella

Explanation: Phytoplankton carry out photosynthesis in water, using light and carbon dioxide to produce food and release molecular oxygen. The other listed organisms do not normally oxygenate water through photosynthesis.

769. The process of converting wet waste to manure is___________?

• A. Metabolism
• B. Conservation
• C. Incineration
• D. Composting

Explanation: Composting uses microorganisms to decompose wet organic waste into nutrient-rich manure. Incineration burns waste, while conservation and metabolism describe broader processes rather than this waste-treatment method.

770. Which of the following pollutants in water causes "Minamata disease?

• A. Methyl Mercury
• B. Lead
• C. Salmonella
• D. Perchlorate

Explanation: Minamata disease results from methylmercury poisoning, usually after contaminated water and aquatic organisms carry mercury through the food chain. It primarily damages the nervous system.