Primary Level Science Quiz

Explanation
Fat is the nutrient that gives more energy when compared to carbohydrates. While carbohydrates provide 4 calories per gram, fats provide 9 calories per gram. This is because fats are more concentrated in energy and require more metabolic processes to be broken down and utilized by the body. Therefore, consuming foods high in fat can provide a greater amount of energy compared to foods high in carbohydrates.

Explanation
Proteins are essential macromolecules that play a crucial role in the structure and function of our body. They are involved in various biological processes and are responsible for building and repairing tissues, producing enzymes and hormones, and supporting the immune system. Therefore, it is correct to say that proteins are the building blocks of our body.

Explanation
Vitamin B is the correct answer because it is a water-soluble vitamin. Water-soluble vitamins are easily dissolved in water and are not stored in the body, so they need to be consumed regularly through the diet. Vitamin D, Vitamin A, and Vitamin E are all fat-soluble vitamins, meaning they are absorbed and stored in fat cells in the body.

Explanation
The statement "There are 23 known vitamins" is false. In reality, there are only 13 essential vitamins that are recognized by the scientific community. These essential vitamins include vitamin A, vitamin C, vitamin D, vitamin E, vitamin K, and the B vitamins (thiamine, riboflavin, niacin, pantothenic acid, biotin, vitamin B6, vitamin B12, and folate). While there are other compounds that may be referred to as vitamins by some, the commonly accepted number of essential vitamins is 13.

Explanation
Dietary fiber is commonly referred to as roughage because it consists of plant-based substances that cannot be fully digested by the human body. It adds bulk to the diet, aids in digestion, and helps prevent constipation. Roughage is an important component of a healthy diet as it promotes regular bowel movements and contributes to overall gut health.

Explanation
Our body is made up of a significant amount of water, ranging from 60-70%. Water is essential for various bodily functions, including digestion, circulation, and temperature regulation. It helps transport nutrients, remove waste, and lubricate joints. Adequate hydration is crucial for maintaining overall health and well-being.

Explanation
Babies have around 300 bones at birth, while adults have around 206 bones. As babies grow, some of their bones fuse together, resulting in a decrease in the total number of bones. Therefore, it is true that babies have around 100 more bones than adults.

Explanation
Rain contains vitamin B12.

Explanation
Tomatoes are classified as fruit because they develop from the ovary of a flower and contain seeds. Although commonly thought of as a vegetable due to their culinary uses, scientifically, they meet the criteria to be considered a fruit. Fruits are the mature ovaries of flowering plants that contain seeds, and tomatoes fit this definition. Therefore, the correct answer is true.

Explanation
Unsaturated fats are usually liquid at room temperature because they have double bonds in their carbon chains. These double bonds introduce kinks in the structure of the fat molecules, preventing them from packing tightly together. As a result, unsaturated fats have a lower melting point and remain in a liquid state at room temperature. In contrast, saturated fats lack double bonds and have a straighter structure, allowing them to pack tightly and solidify at room temperature.