Question

name: name date: date instructions: this recall worksheet reviews key science concepts you may have learned in middle school. answer all questions to the best of your ability. section 1: life science basics 1. what are the 3 main parts of a cell that are found in both plant and animal cells? 2. what part of the plant cell carries out photosynthesis? 3. list the four main needs of all living organisms. 4. true or false: cells are considered the basic unit of life. 5. what is one difference between plant cells and animal cells? 6. why is water important for all living things? section 2: physical science connections 7. matter is made up of tiny particles called ____________. 8. what are the three states of matter? 9. what is the difference between a solid and a liquid in terms of particle movement? 10. what is the difference between mass and weight? 11. give one example of a chemical change and one example of a physical change. section 3: earth & environmental science 12. what gas do humans need to survive? 13. what gas do plants take in during photosynthesis? 14. name one renewable resource and one non - renewable resource.

Explanation:

1. The three main parts of a cell found in both plant and animal cells are the cell membrane, cytoplasm, and nucleus. The cell membrane controls what enters and leaves the cell, the cytoplasm is the jelly - like substance where many cell processes occur, and the nucleus contains genetic material.
2. Chloroplasts in plant cells carry out photosynthesis as they contain chlorophyll which can capture light energy.
3. The four main needs of all living organisms are food (for energy and nutrients), water (for chemical reactions and to maintain cell structure), air (for gas exchange like oxygen for respiration), and a suitable living environment (temperature, space etc.).
4. True. Cells are the basic unit of life as they can perform all life - sustaining functions on their own or as part of a larger organism.
5. One difference between plant cells and animal cells is that plant cells have a cell wall which provides structure and support, while animal cells do not.
6. Water is important for all living things because it is a solvent for many biochemical reactions, helps in transporting nutrients and waste within organisms, and is involved in maintaining body temperature.
7. Matter is made up of tiny particles called atoms.
8. The three states of matter are solid, liquid, and gas.
9. In a solid, particles are closely packed and vibrate in place. In a liquid, particles are close together but can move past each other.
10. Mass is the amount of matter in an object and is constant. Weight is the force of gravity acting on an object and can change depending on the gravitational field.
11. An example of a chemical change is burning wood (a new substance, ash, is formed). An example of a physical change is melting ice (only the state of water changes).
12. Humans need oxygen gas to survive as it is used in cellular respiration to produce energy.
13. Plants take in carbon dioxide during photosynthesis.
14. A renewable resource is solar energy (it can be replenished naturally). A non - renewable resource is coal (it takes millions of years to form and is being used up faster than it can be replenished).

Answer:

1. Cell membrane, cytoplasm, nucleus
2. Chloroplasts
3. Food, water, air, suitable environment
4. True
5. Plant cells have a cell wall; animal cells do not
6. It is a solvent for biochemical reactions, helps in transport, and maintains body temperature
7. Atoms
8. Solid, liquid, gas
9. In solid, particles vibrate in place; in liquid, particles move past each other
10. Mass is amount of matter, constant; weight is force of gravity, can change
11. Burning wood (chemical change), melting ice (physical change)
12. Oxygen
13. Carbon dioxide
14. Solar energy (renewable), coal (non - renewable)