Science Gr.7 Unit Test

The given equation represents the process of photosynthesis, where sunlight energy, water, and carbon dioxide are converted into oxygen and simple sugars. During photosynthesis, plants use the energy from the sun to produce glucose, which is a type of simple sugar, and release oxygen as a byproduct. This process is essential for the survival of plants and is responsible for the production of oxygen in the atmosphere.

Biomes exist due to climatic conditions. Different regions on Earth have varying temperatures, precipitation levels, and sunlight exposure, which create distinct climates. These climatic conditions determine the types of plants, animals, and ecosystems that can thrive in a particular area, leading to the formation of different biomes. For example, tropical rainforests exist in areas with high temperatures and abundant rainfall, while deserts exist in areas with low precipitation and extreme temperatures. The combination of these climatic factors shapes the characteristics and biodiversity of each biome.

Joseph Priestly made an experiment of the carbon cycle.

An ecosystem refers to the interaction between organisms and their environment. It encompasses the living organisms, such as plants and animals, as well as the non-living components like air, water, and soil. This interaction involves the exchange of energy and matter, where organisms depend on each other and their surroundings for survival. Ecosystems can vary in size, ranging from a small pond to a vast forest, and they play a crucial role in maintaining the balance of nature.

A cycle is a pattern that repeats over time in nature. It can refer to various phenomena, such as the water cycle, the carbon cycle, or the life cycle of organisms. These cycles involve a series of events or processes that occur in a predictable sequence and repeat themselves. They are essential for maintaining balance and stability in the natural world.

The correct answer is "an organism that eats other organisms". This is because a predator is a type of organism that hunts, kills, and consumes other organisms for food. Predators are an important part of the food chain as they help regulate the population of their prey and maintain the balance of ecosystems. A consumer, on the other hand, is a broader term that includes both predators and other organisms that obtain energy by consuming other organisms or organic matter.

A biotic element refers to a living part of the environment. This can include plants, animals, fungi, and microorganisms that interact with each other and their surroundings. Biotic elements play a crucial role in the functioning of ecosystems as they contribute to the nutrient cycle, energy flow, and overall biodiversity. These living organisms are interconnected and depend on each other for survival, making them an essential component of the environment.