5.8 Plant Survival

Most of the materials that plants need to grow come from __________.

• Other plants
• The air
• Soil
• Fertilizer

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Which of the following statements are true regarding plant growth?

• Plant growth is the process by which animals develop their skills and abilities.
• Plant growth refers to the way plants change color throughout the seasons.
• Plant growth refers to an increase in the size, abundance or complexity of the plant.
• Plant growth is when plants produce sounds and communicate with each other.

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In a famous experiment, a scientist measured the mass of a small willow tree seedling and the mass of a pot of dry soil. The willow tree was planted in the soil, and only water was added as the tree grew. After five years, the mass of the soil and the willow were measured again. What data from this investigation supports the claim that soil does not provide most of the materials a plant needs to grow?

• The mass of the dry soil was greater than the tree after it grew.
• After the willow tree grew, the soil lost 0.1 kg of mass.
• The willow gained mass, but the soil lost almost no mass.
• The amount of mass the willow tree gained during the five years was 74.7 kg.

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As a plant grows, it gains mass. Which of the following provides the most matter that a plant uses for its growth?

• Gases in the air
• Minerals in the soil
• Salt in the water
• Chemicals in fertilizers

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The idea that plants do not need soil to grow is supported by which of the following observations?

• Plants remain green for several hours after being removed from the soil.
• Different types of plants grow better in different types of soil.
• Some plants are grown in containers with nothing but water.
• When plants die, some of their nutrients are returned to the soil.

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What do plants need in order to live and grow?

• Energy from the Sun, water, air, nutrients, and room to grow.
• Fertilizer only
• Water only
• Fertilizer and Soil only

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What are the different parts of the plant?

• Leaves, stem, roots
• Stalk, root, bean
• Stem, trunk, roots
• Stem and leaves

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Growing plants without soil in nutrient-rich water is __________.

• Hydroponics
• Soil growth
• Horticulture
• Photosynthesis

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Leaves take in ___________ from the air.

• Carbon Dioxide
• Oxygen
• Nitrogen
• Uranium

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Leaves release __________ into the air.

• Uranium
• Nitrogen
• Carbon Dioxide
• Oxygen

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