2019 NovDec Science Questions
Are you curious about the science questions asked in the 2019 NovDec exams? Look no further, as we provide you with the answers to some of the most frequently asked questions in this article.
1. What is the process of photosynthesis?
Photosynthesis is the process by which green plants and some other organisms convert sunlight, carbon dioxide, and water into glucose and oxygen. The process takes place in the chloroplasts of the plant cells, where chlorophyll captures light energy, initiating a series of chemical reactions that ultimately produce glucose.
2. What is the difference between an element and a compound?
An element is a pure substance made up of only one type of atom. It cannot be broken down into simpler substances. In contrast, a compound is a substance formed when two or more elements chemically combine. Compounds have a fixed ratio of atoms and can be broken down into their constituent elements through chemical reactions.
3. What is the law of conservation of energy?
The law of conservation of energy states that energy cannot be created or destroyed; it can only be transformed or transferred from one form to another. This principle is based on the idea that the total amount of energy in a closed system remains constant.
4. How does DNA determine genetic traits?
DNA, or deoxyribonucleic acid, contains the genetic instructions for the development and functioning of living organisms. It is composed of a sequence of nucleotides that encode information for the production of proteins. Specific segments of DNA, called genes, carry the instructions for particular traits, such as eye color or height.
5. What is the difference between speed and velocity?
Speed is a scalar quantity that measures how fast an object is moving, regardless of direction. It is calculated by dividing the distance traveled by the time taken. Velocity, on the other hand, is a vector quantity as it includes both the speed and direction of an object’s motion. It is calculated by dividing the displacement by the time taken.
Frequently Asked Questions
1. How does gravity affect objects?
Gravity is a force that attracts objects with mass towards each other. It affects objects by giving them weight and causing them to fall towards the center of the Earth. Without gravity, objects would float freely in space.
2. What is the difference between renewable and non-renewable energy sources?
Renewable energy sources are those that can be replenished naturally and are not depleted with use, such as solar power, wind energy, and hydroelectric power. Non-renewable energy sources, like fossil fuels, are finite and will eventually run out. They are formed over millions of years from the remains of dead plants and animals.
3. How does the greenhouse effect contribute to climate change?
The greenhouse effect is caused by the presence of greenhouse gases, such as carbon dioxide and methane, in the Earth’s atmosphere. These gases trap heat from the sun, preventing it from escaping back into space. Human activities, such as burning fossil fuels and deforestation, increase the concentration of greenhouse gases, leading to global warming and climate change.
4. What is the role of enzymes in biological reactions?
Enzymes are proteins that act as catalysts in biological reactions. They speed up the rate of chemical reactions by lowering the activation energy needed for the reaction to occur. Enzymes are specific to the substrates they bind to, and their activity can be affected by factors such as temperature and pH.
5. What are the main stages of the cell cycle?
The cell cycle consists of four main stages: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). During G1, the cell grows and carries out its normal functions. In the S phase, DNA replication occurs, resulting in the duplication of the genetic material. G2 is a period of further cell growth and preparation for mitosis. Mitosis, or cell division, is divided into prophase, metaphase, anaphase, and telophase.
6. What are the three states of matter?
The three states of matter are solid, liquid, and gas. In the solid state, particles are tightly packed and have a fixed shape and volume. Liquids have particles that are close together but can move past one another, giving them a variable shape but a fixed volume. Gas particles are far apart and move freely, allowing them to occupy any volume and shape.
Now that you have explored the answers to the 2019 NovDec science questions, take the opportunity to further expand your knowledge and understanding of these key concepts. Science plays a crucial role in our lives, and by delving deeper into these topics, you can gain valuable insights and insights.
Continue exploring and seeking answers to scientific questions, whether through further study, practical experimentation, or engaging in discussions with experts and enthusiasts in the field. Science is an ever-evolving discipline, and the more we learn, the better equipped we become to understand and navigate the world around us.