IGCSE PE Multiple Choice Quiz

Explanation
Protein is needed for growth because it is an essential nutrient that plays a crucial role in building and repairing tissues. It is made up of amino acids, which are the building blocks of proteins. These amino acids are necessary for the growth and development of muscles, bones, organs, and other body tissues. Protein also helps in the production of enzymes, hormones, and antibodies, which are essential for various bodily functions. Therefore, protein is an important nutrient required for growth.

Explanation
Aerobic respiration requires the combination of glucose and oxygen. Glucose is a type of sugar that serves as the primary source of energy for cells. Oxygen is necessary for the process of cellular respiration, where glucose is broken down to release energy. This process occurs in the presence of oxygen and produces carbon dioxide and water as byproducts. Therefore, the correct answer is glucose + oxygen.

Explanation
The correct answer is 220 - age. This formula is commonly used to estimate a male's maximum heart rate (MHR). The MHR is the highest number of times a person's heart can beat in one minute during intense physical activity. By subtracting the age from 220, we can approximate the MHR. However, it is important to note that this is a general estimation and individual variations may exist.

Explanation
During anaerobic respiration, when there is a lack of oxygen, glucose is broken down into lactic acid and carbon dioxide. Lactic acid is produced as a byproduct of this process, which can accumulate in the muscles and cause fatigue and muscle soreness. Carbon dioxide is also released as a waste product. This process is commonly observed in organisms like bacteria and yeast, as well as during intense exercise in humans.

Explanation
The 1936 Olympics were held in Berlin. This was a significant event in history as it was during the time of Nazi Germany, and Adolf Hitler used the Olympics as a propaganda tool to showcase Aryan supremacy. The Berlin Olympics also saw the iconic performance of African American athlete Jesse Owens, who won four gold medals and defied Hitler's racist ideology.