Space Homework Practice
| # | Answer |
|---|---|
| 1 | Space is the vast region beyond Earth’s atmosphere that contains stars, planets, moons, and other celestial objects. |
| 2 | Microgravity means a condition where gravity seems very weak, such as during spaceflight. |
| 3 | One major challenge is loss of muscle mass. |
| 4 | Astronauts need special food because it must be safe, easy to store, and simple to eat in microgravity. |
| 5 | Plants can help provide food and oxygen for astronauts. |
| 6 | Oxygen is used in cellular respiration to help cells release energy from food. |
| 7 | Fluids shift upward in the body, which can make the face look puffy. |
| 8 | Bone density is the amount of mineral content in bones, which affects their strength. |
| 9 | Bone density can decrease because bones are not bearing as much weight in microgravity. |
| 10 | Astronauts can exercise regularly using special equipment. |
| 11 | A spacecraft is a vehicle designed to travel in space. |
| 12 | They must be sealed so astronauts can have air pressure and a breathable atmosphere. |
| 13 | A spacesuit protects astronauts from vacuum, temperature extremes, and radiation, and supplies oxygen. |
| 14 | A closed life-support system recycles air, water, and sometimes waste to support life. |
| 15 | Water recycling is important because water is limited and expensive to transport. |
| 16 | The immune system may become weaker or function differently during spaceflight. |
| 17 | Sleep can be difficult because astronauts experience unusual light cycles, noise, and microgravity. |
| 18 | Circadian rhythm is the body’s internal 24-hour cycle that helps regulate sleep and wakefulness. |
| 19 | Space travel can disrupt circadian rhythm because astronauts see many sunrises and sunsets each day. |
| 20 | Radiation is energy from particles or waves that can be harmful to living cells in space. |
| 21 | They are exposed to more radiation because Earth’s atmosphere and magnetic field provide less protection in space. |
| 22 | It provides a place to study how living organisms respond to microgravity. |
| 23 | Scientists study plants, bacteria, or animals such as mice or insects. |
| 24 | Bacteria are studied to see how microgravity affects growth, genetics, and behavior. |
| 25 | A biosphere is a system that supports living organisms in a particular environment. |
| 26 | Both must provide living organisms with air, water, nutrients, and waste removal. |
| 27 | Photosynthesis is the process by which plants use light, carbon dioxide, and water to make sugars and oxygen. |
| 28 | It can help produce oxygen and food for astronauts. |
| 29 | A growth chamber is used to grow plants or study organisms under controlled conditions. |
| 30 | They use them to control light, temperature, water, and other variables. |
| 31 | Roots may grow in unusual directions because they do not rely on gravity the same way. |
| 32 | It helps scientists learn how to grow food during long missions. |
| 33 | An adaptation is a trait or behavior that helps an organism survive in its environment. |
| 34 | A human adaptation needed for space travel is using exercise to keep muscles strong. |
| 35 | Reproduction may be challenging because development can be affected by radiation and microgravity. |
| 36 | They monitor heart rate to track how the cardiovascular system is responding to microgravity and exercise. |
| 37 | The cardiovascular system may adapt because fluids shift and the heart does not work against gravity as much. |
| 38 | They study it to understand balance, coordination, and sensory changes. |
| 39 | Balance may be affected because the inner ear and body sense gravity differently in microgravity. |
| 40 | They need monitoring because space can affect many body systems, including muscles, bones, and immunity. |
| 41 | Fruit flies are useful because they have many genes and body processes similar to humans. |
| 42 | It can show how cells, tissues, and body systems may respond to space conditions. |
| 43 | Long-term missions can make it harder to maintain a balanced diet with enough vitamins and calories. |
| 44 | Vitamin D helps support bone health and calcium use in the body. |
| 45 | They may lose appetite because of changes in smell, taste, or body function in microgravity. |
| 46 | Space travel can change which genes are turned on or off in cells. |
| 47 | It is designed to test how living organisms respond to space conditions. |
| 48 | It helps scientists prepare for the health needs of astronauts on long journeys. |
| 49 | It helps designers create safer habitats, better food systems, and effective health protections. |
| 50 | Biology is essential because it helps scientists understand how living things survive in space and how to protect astronaut health. It also supports the design of life-support systems for future exploration. |