Exploring Science: Grade 7

What are the main functions of the circulatory system?

• Regulate blood pressure only

• Store excess nutrients

• The main functions of the circulatory system are to transport blood, deliver oxygen and nutrients, remove waste products, and regulate body temperature.

• Produce hormones for digestion

Name the four types of human body tissues.

• Connective, muscle, epithelial, respiratory

• Epithelial, skeletal, adipose, lymphatic

• Nervous, muscle, digestive, skeletal

• Epithelial, connective, muscle, nervous

What is the role of the respiratory system in the human body?

• The role of the respiratory system is to facilitate gas exchange, providing oxygen to the body and removing carbon dioxide.

• To regulate body temperature and maintain homeostasis.

• To circulate blood throughout the body.

• To digest food and absorb nutrients.

Describe the process of photosynthesis in plants.

• Photosynthesis is the process by which plants convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water.

• Photosynthesis is the process of plants breathing in carbon dioxide.

• Photosynthesis occurs only at night in plants.

• Plants absorb nutrients from the soil through photosynthesis.

What are the stages of a plant's life cycle?

• Photosynthesis, Dormancy, Maturity

• Transpiration, Respiration, Decay

• Germination, Seedling, Vegetative, Flowering, Pollination, Seed Production

• Germination, Growth, Harvesting

How do plants reproduce?

• Plants reproduce only through spores.

• Plants reproduce by absorbing nutrients from the soil.

• Plants reproduce sexually through flowers and seeds, and asexually through methods like runners and cuttings.

• Plants reproduce exclusively through cloning.

What is a chemical reaction?

• A chemical reaction is a method of measuring the weight of substances.

• A chemical reaction is when substances are heated to produce light.

• A chemical reaction is a process where substances (reactants) are transformed into different substances (products) through the rearrangement of atoms.

• A chemical reaction is the process of mixing two liquids without any change.

What are the signs that a chemical reaction has occurred?

• Solid dissolving in a liquid

• Mixing two liquids without any change

• Signs of a chemical reaction include gas formation, color change, temperature change, precipitate formation, and light or sound emission.

• Water boiling at 100°C

What is the difference between an endothermic and exothermic reaction?

• Endothermic reactions release heat; exothermic reactions absorb heat.

• Endothermic reactions absorb heat; exothermic reactions release heat.

• Both endothermic and exothermic reactions absorb heat.

• Endothermic reactions occur only in gases; exothermic reactions occur only in liquids.

Give an example of a chemical reaction that occurs in everyday life.

• Baking a cake

• Rusting of iron

• Combustion of gasoline in a car engine.

• Photosynthesis in plants