20 Questions
Which of the following is an example of an animal response to stimuli?
Production of enzymes
Which of the following is an example of an external factor that regulates plant growth?
Light intensity
What happens to deciduous trees as the days get shorter?
They shed their leaves
Which of the following adaptations do chilies have to protect themselves from animals?
They have oils that cause a burning sensation in the mouth
What is the purpose of the sharp thorns on a Hawthorn bush?
To discourage animals from eating it
Which of the following adaptations do nettles have to protect themselves from animals?
They have stings containing formic acid
Which hormone is responsible for stem elongation and root and shoot development?
Gibberellins
Which scientist discovered that phototropism is controlled by a mobile chemical signal?
Peter Boysen-Jensen
What is the effect of a high concentration of auxin near the growing tip of a stem?
Promotes lateral bud growth
What is the growth response of a plant to touch called?
Thigmotropism
What are the external factors that regulate the growth of plants?
Light intensity, day length, gravity, and temperature
Which type of factors control growth located inside the plant?
Internal factors
What happens to deciduous trees as the days get shorter?
Deciduous trees shed their leaves
Which of the following adaptations do gorse plants have to protect themselves from animals?
Gorse plants have hard, stiff, pointed leaves
What is the purpose of the oils in chilies?
The oils in chilies cause a burning sensation in the mouth
What is the growth response of a plant to water called?
Hydrotropism
What is the main effect of auxins on cell elongation?
Auxins cause the cells to absorb more water and swell in size.
Which of the following is NOT a main effect of auxins?
Leaf growth
What is the role of the high concentration of auxin near the growing tip of a stem?
It inhibits the growth of lateral buds and keeps them dormant.
Which of the following is an example of a tropism?
The growth of a stem towards light
Test your knowledge on plant responses to stimuli with this quiz! Explore how plants detect and respond to changes in light, temperature, gravity, and more. Learn about the different growth, flowering, and hormonal responses that plants exhibit. Challenge yourself and become an expert on plant sensitivity and adaptation!
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