Do You Know Year 7 Biology?

The three main food types in a balanced diet are fiber, protein, and carbohydrates. Fiber is essential for maintaining a healthy digestive system and preventing constipation. Protein is necessary for building and repairing tissues, as well as supporting the immune system. Carbohydrates provide energy for the body and should come from sources like whole grains, fruits, and vegetables. MacDonalds and chocolate are not considered main food types in a balanced diet.

Puberty is the period during which a child's body undergoes significant physical and hormonal changes, typically starting around the age of 13. This process includes the development of secondary sexual characteristics, growth spurts, and, in girls, the onset of menstruation. Puberty marks the transition from childhood to adolescence and is a natural part of human development.

Red blood cells (RBCs) have a crucial role in transporting oxygen from the lungs to the body’s tissues and returning carbon dioxide from the tissues to the lungs for exhalation. These cells contain hemoglobin, a protein that binds to oxygen, allowing it to be carried throughout the bloodstream. This process is vital for cellular respiration, providing the energy required for bodily functions. Without sufficient RBCs or hemoglobin, the body's organs and tissues would not receive enough oxygen, leading to fatigue and other health issues.

The correct answer is "lungs". The lungs are vital organs that enable the process of breathing. They take in oxygen from the air and expel carbon dioxide from the body. They are a pair of organs located in the chest cavity and are essential for respiration, which supplies oxygen to the body and removes waste gases.

Photosynthesis is a process used by plants, algae, and certain bacteria to convert light energy, usually from the sun, into chemical energy stored in glucose (a sugar). During photosynthesis, plants take in carbon dioxide (CO2) from the air and water (H2O) from the soil. Using the energy from sunlight, they transform the CO2 and H2O into glucose and oxygen (O2). The glucose provides energy and the building blocks for growth, while the oxygen is released as a byproduct into the atmosphere. This process is crucial for life on Earth, as it is the primary source of oxygen and it forms the base of most food chains.

The platypus is a mammal, which are characterized by being warm-blooded, having hair or fur, giving birth to live young (except for monotremes like the platypus that lay eggs), and producing milk to feed their young. The platypus is unique in that it has features like a duck-like bill and lays eggs, distinguishing it from other mammals, but it still possesses all the key characteristics of a mammal.

The average menstrual cycle lasts for 28 days, although it can vary from person to person. The cycle begins on the first day of menstruation and ends just before the next period starts. This cycle includes stages like ovulation, the thickening of the uterine lining, and the shedding of the lining if no fertilization occurs. Understanding this cycle is important for tracking reproductive health.

Stomata are small openings on the surface of leaves that facilitate gas exchange. Through these openings, plants take in carbon dioxide for photosynthesis and release oxygen as a byproduct. Stomata also allow water vapor to escape from the plant, a process known as transpiration. This not only helps in the uptake of carbon dioxide but also aids in cooling the plant and maintaining water balance. The opening and closing of stomata are controlled by guard cells to regulate water loss and gas exchange, crucial for plant survival.

Lipogenesis is the process of converting carbohydrates into fatty acids for storage. While indirectly related to energy metabolism, it's not a primary player in the immediate regulation of blood glucose. Gluconeogenesis produces glucose, glycogenolysis breaks down glycogen into glucose, and insulin secretion promotes glucose uptake by cells, all directly impacting blood sugar levels.

Alcohol is bad for your body because it impairs your mental capacity, acting as a depressant, affecting your liver, and making you angry. Alcohol consumption can lead to cognitive impairment, slowing down brain function and decision-making abilities. It is classified as a depressant because it slows down the central nervous system, causing relaxation and sedation. Long-term alcohol abuse can damage the liver, leading to conditions like cirrhosis. Additionally, alcohol can alter mood and behavior, increasing the likelihood of aggressive or angry outbursts.