Class 9 Science NCERT Ch 1 & 7 Quiz

Matter is anything that occupies space and has mass. It is a fundamental concept in science that helps us understand the physical world around us. The concept of matter is significant in our daily life as it helps us to classify and distinguish between different substances, understand their properties and behavior, and use them effectively in various applications.

An element is a substance that consists of only one type of atom, whereas a compound is a substance that consists of two or more different types of atoms chemically bonded together. For example, oxygen is an element, whereas water (H2O) is a compound.

Autotrophic organisms, such as plants, make their own food through a process called photosynthesis. During photosynthesis, they use energy from sunlight, water, and carbon dioxide to produce glucose and oxygen.

<p>Forest ecosystem plays a crucial role in maintaining ecological balance by providing oxygen, regulating climate, and supporting a wide range of biodiversity. Forests also act as a carbon sink, absorbing carbon dioxide from the atmosphere and helping to mitigate the effects of climate change.</p> Signup and view all the answers

<p>Chlorophyll is a green pigment found in plants that plays a crucial role in the process of photosynthesis. It absorbs light energy from the sun and uses it to convert carbon dioxide and water into glucose and oxygen.</p> Signup and view all the answers