Science worksheets for class 7
Access printable science worksheets for class 7
A change in an organism’s external environment that causes a response from the organism.
External Stimuli
Internal Stimuli
Energy Transformation
Turgor Pressure
A change in an organism’s internal environment that causes a response from the organism.
External Stimuli
Internal Stimuli
Energy Transformation
Turgor Pressure
The growth (or response) of a plant towards or away from LIGHT.
Phototropism
Geotropism
Thigmotropism
Hydrotropism
The growth (or response) of a plant towards or away from the Earth’s GRAVITY.
Phototropism
Geotropism
Thigmotropism
Hydrotropism
The growth (or response) of a plant towards or away from TOUCH.
Phototropism
Geotropism
Thigmotropism
Hydrotropism
The growth (or response) of a plant towards WATER.
Phototropism
Geotropism
Thigmotropism
Hydrotropism
A series of chemical reactions in plants that convert light energy, water and carbon dioxide into food energy and gives off oxygen (basically plants making their own food).
Tropism
Stimulus
Photosynthesis
Wilting
An organism’s ability to maintain steady internal conditions when outside conditions change, also called maintaining balance.
Homeostasis
Hormones
Hydrotropism
Homer
In plant cells, the force, exerted by the flow of water, within the cell that pushes the plasma membrane against the cell wall. This force gives plants structure and helps them stand up and not wilt.
External Stimuli
Internal Stimuli
Energy Transformation
Turgor Pressure
Which type of plant tropism response is shown in the video?
Phototropism
Geotropism
Thigmotropism
Hydrotropism
Which type of plant tropism response is shown in the video?
Phototropism
Geotropism
Thigmotropism
Hydrotropism
Which type of plant tropism response is shown in the video? Hint: The roots are growing towards the water source.
Phototropism
Geotropism
Thigmotropism
Hydrotropism
Which type of plant tropism response is shown in the video? Hint: Even though the plant is laying on its side, it starts growing up (away from the Earth's gravitational force).
Phototropism
Geotropism
Thigmotropism
Hydrotropism
What plant cell process is being shown in this video after the water is added to the soil?
The plant cell vacuoles are filling with water and increasing turgor pressure.
The plant cell vacuoles are losing water and decreasing turgor pressure.
The plant cell vacuoles are loosing water and starting to collapse from gravitational pressure.
The plant cell vacuoles are responding to light and forcing the plant to grow upwards.
Any change in an organism’s environment that causes the organism to react. Example: The Sun would be this for a plant demonstrating phototropism.
Stimulus
Response
Effect
Force
How an organism reacts to a stimulus, usually resulting in a change of behavior. Example: A plant grows towards a window because of the light from the Sun.
Stimulus
Response
Effect
Force
Why do plants develop tropisms (which help them maintain homeostasis and stay alive)?
Plants need food and water to live. They grow towards sources of food in the soil in order to eat.
Plants depend on people to keep them alive and well. Tropisms are designed to help people understand why plants only respond when people water them and keep them in the sunlight.
Plants need light and water for photosynthesis. They have developed responses called tropisms to help make sure they grow towards sources of light and water.
Tropisms are not important for plant growth and homeostasis. The correct answer is not shown here.
Plants react to seasonal changes on the Earth (Fall, Winter, Spring, Summer). What causes the seasons on Earth?
The tilt of the Earth towards or away from the Sun throughout the year.
The rotation of the Earth on its center axis.
The revolution of the Earth around the Sun.
The Earth moves much closer to the Sun during Summer making it hotter all over the Earth.
The plant organelle that uses light energy to make food from water and carbon dioxide in a process known as photosynthesis.
Nucleus
Chloroplast
Vacuole
Mitochondria
Plant growth toward or away from an external stimulus.
Tropism
Transpiration
Wilting
Turgor Pressure
Browse science worksheets by class
Explore worksheets for other subjects
Other topics to explore
Do more than worksheets with Quizizz
Interactive science worksheets & quizzes
Quizizz is an online platform that helps teachers create interactive worksheets for their students. With Quizizz, teachers can create science-based worksheets that are fun and engaging for students. The platform also provides tools to help teachers monitor and assess student progress. Quizizz makes it easy for teachers to create interactive worksheets that make learning science fun and engaging.