Science Quiz Class 6

The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains high concentration of ozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.

Oranges contain 53 mg of vitamin C per 100 grams. One medium orange delivers 70 mg of vitamin C. Other citrus fruits, such as grapefruit, mandarins and limes, are also good sources of this vitamin.

Condensation is the process by which water vapor (water in its gas form) turns into liquid. It happens when molecules of water vapor cool and collect together as liquid water. Water vapor can be found on the outside of cold glasses, the warm side of windows, and in the clouds up in the air.

Liver is the largest gland in human body. It is also the largest (internal) organ in our body and can weigh up to 1.5 kg for a human adult. That is, about 1/50th of the body weight is because of liver.

Heart attack is not caused by improper disposal of sewage. Heart attack occurs when the blood flow to the heart is blocked, usually due to a buildup of cholesterol and other substances in the arteries. Improper disposal of sewage can lead to the spread of waterborne diseases such as cholera, typhoid, and jaundice, but it does not directly cause heart attacks.

Biodegradable waste includes any organic matter in waste which can be broken down into carbon dioxide, water, methane or simple organic molecules by micro-organisms and other living things by composting, aerobic digestion, anaerobic digestion or similar processes.

Lateral inversion for mirrors refers to the image being seen inverted in terms of what is left and right. When facing a mirror, the left side of an object appears to be the right side of the virtual image in the mirror. This does not apply from top to bottom though, only left to right.

Anaerobic respiration is the respiration which occurs in the absence of oxygen. It is carried out by yeast and some bacteria. In this, glucose breaks down into pyruvates in absence of oxygen. Glucose breaks down into ethanol, carbon dioxide and gives two molecules of ATP.

Desert shrubs typically have small leaves, protective thorns, multiple branches, unpleasant smells and tastes, and extensive root systems, all adaptations to the arid environment. Some have small, shiny, waxy leaves that reflect heat and block evaporation.

Green plants are green because they contain a pigment called chlorophyll. Chlorophyll absorbs certain wavelengths of light within the visible light spectrum. ... Green light is not absorbed but reflected, making the plant appear green. Chlorophyll is found in the chloroplasts of plants.