Plant Growth in Space

Why do astronauts need to grow their own food when they are in space for a long time?

• To make the spaceship smell nice.

• To have fresh food instead of only packaged food.

• To have something to play with.

• To make the spaceship look pretty.

On Earth, what helps plants know which way to grow their roots?

• The wind

• Gravity

• Other plants

• The color of the soil

In space, where there is no gravity, what do plants use to know which way to grow?

• Sound

• Temperature

• Light

• Smell

How does water behave differently in space compared to Earth?

• It freezes faster.

• It evaporates quicker.

• It has high surface tension and likes to stick to things.

• It becomes invisible.

What problem can happen if water clings too much to plant roots in space?

• The roots become too strong.

• The plant grows too fast.

• The roots cannot breathe, causing drought stress.

• The plant changes color.

What special tools do scientists use to find out if plants in space are stressed or unhealthy?

• Microscopes and magnifying glasses.

• Special cameras that use infrared and other light.

• Thermometers and rulers.

• Sound detectors and microphones.

What is used to help seeds grow and keep them from floating away in space?

• Tiny nets.

• Sticky tape.

• Plant pillows with special wrappers.

• Small plastic bags.

Besides providing food, what is another important benefit of growing plants in space for astronauts?

• It helps them sleep better.

• It makes them feel happier and can recycle air and water.

• It helps them exercise more.

• It makes the spaceship brighter.