18 Questions
What type of light activates the phytochrome Pr?
Red light
What happens to plant growth when the inactive form of phytochrome (Pr) is produced?
Plants grow slower
What is the result of the conversion of chromoprotein into the active form (Pfr) by red light from the sun?
Plants grow towards the sunlight
What is the primary role of phototropism in plant growth?
Orienting plants towards sunlight
What type of phytochrome is activated by far-red light?
Type I (Pfr)
What is the relationship between phototropism and gravitropism in plant growth?
Phototropism and gravitropism work together to regulate plant growth
What is the primary role of phototropins in plant responses?
To mediate the phototropic response by detecting blue light
What is the result of etiolation in plants?
Increased chances of reaching light, but with less desirable symptoms
What is the function of the apical meristem in phototropism?
To perceive light and transmit signals through phototropins
What is the type of light detected by phototropins?
Blue light
Who discovered that light is perceived by the tip of the plant?
Charles Darwin
What is the term for the movement of plants towards or away from light?
Phototropism
What is the term for the amount of light and darkness in a daily cycle of 24 hours?
Photoperiodic Response
What is the point at which the photoperiod switches from being noninductive to inductive?
Critical Daylength
What type of plants can only flower in the inducing photoperiod?
Plants with an obligate response
What is the term for the process by which plants measure time?
Circadian clock
What is the importance of an animal's sensory system?
It detects signals from the environment and communicates them to the body
What is the process of artificially exposing plants to low temperatures to stimulate flowering or enhance seed production?
Vernalization
Test your knowledge on gravitropism and thigmotropism in plants. Learn about how plants respond to gravity and touch through differential growth and movement. Explore the concepts of positive gravitropism in roots, negative gravitropism in stems, and various responses to touch.
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