Absence of true roots stems and leaves
Answer:
11) A. The optimum pH of an enzyme is 6.6
12) C. A control group
Answer: The given statement is true.
Sun is the ultimate source for energy on the Earth. It is the natural and renewable source of energy on earth as it can easily be renewed and never run off. All living organisms which are present on earth are dependent on food for survival. For this, they become part of the food chain which provides them energy in the form of food. Food chain begins with plants as they are the primary producers in the food chain. They get energy for preparing food from sunlight in the form of light energy.
Moreover, the life forms which existed millions of years ago were dependent on sun for energy. The dead remains of these life forms have provided the non renewable sources of energy like fossil fuels on earth.
Thus, the sun is considered as the ultimate source of energy on the Earth.
Models can be used to predict or explain events is the statements accurately describe models in science.
Explanation:
- Scientific modeling is also known as a scientific activity. The aim of the modeling can understand easier, define, quantify, visualize. Scientific knowledge gives a common knowledge to everyone.
- Normally, Science is a subject which cannot clearly explain moreover it is to be interpreted.
- There are different types of models present some of them are mathematical models, graphical models, operational models, etc.
- Scientific models are increasing in the fields of science education and Philosophy of education.
