1. Define photosynthesis and write its chemical equation.
2. Write a short note on pseudopodia and villi.
3. Explain how an electric doorbell works.
4. List four main causes of soil pollution.
Answers
Answer:
1. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen. ... In most plants, water is supplied from the roots, with the leaves collecting carbon dioxide via the stomata and sunlight captured by the chloroplasts in the leaves.
2. A pseudopod or pseudopodium (plural: pseudopods or pseudopodia) is a temporary arm-like projection of a eukaryotic cell membrane that are developed in the direction of movement. Filled with cytoplasm, pseudopodia primarily consist of actin filaments and may also contain microtubules and intermediate filaments.[1][2] Pseudopods are used for motility and ingestion. They are often found in amoebas.
3. The "something" is often an electric bell: a little metal bell (like one on a bicycle) and a clapper (hammer) powered by an electromagnet. When someone presses the button, the electromagnet is activated and pulls on the clapper, which strikes the bell.
4. Illegal dumping of the solid wastes, polluted water absorbed by the soil, use of chemical fertilizers and pesticides, dumping of minerals, oils, and radioactive wastes are the major causes of soil pollution