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Plant Tropisms Quiz

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Questions and Answers

What type of light activates the phytochrome Pr?

Far-red light

Red light (correct)

Ultraviolet light

Blue light

What happens to plant growth when the inactive form of phytochrome (Pr) is produced?

Plants grow towards the shade

Plants grow towards the sunlight

Plants grow slower (correct)

Plants grow faster

What is the result of the conversion of chromoprotein into the active form (Pfr) by red light from the sun?

Plants grow slower

Plants grow in a random direction

Plants grow towards the shade

Plants grow towards the sunlight (correct)

What is the primary role of phototropism in plant growth?

Orienting plants towards sunlight Signup and view all the answers

What type of phytochrome is activated by far-red light?

Type I (Pfr) Signup and view all the answers

What is the relationship between phototropism and gravitropism in plant growth?

Phototropism and gravitropism work together to regulate plant growth Signup and view all the answers

What is the primary role of phototropins in plant responses?

To mediate the phototropic response by detecting blue light Signup and view all the answers

What is the result of etiolation in plants?

Increased chances of reaching light, but with less desirable symptoms Signup and view all the answers

What is the function of the apical meristem in phototropism?

To perceive light and transmit signals through phototropins Signup and view all the answers

What is the type of light detected by phototropins?

Blue light Signup and view all the answers

Who discovered that light is perceived by the tip of the plant?

Charles Darwin Signup and view all the answers

What is the term for the movement of plants towards or away from light?

Phototropism Signup and view all the answers

What is the term for the amount of light and darkness in a daily cycle of 24 hours?

Photoperiodic Response Signup and view all the answers

What is the point at which the photoperiod switches from being noninductive to inductive?

Critical Daylength Signup and view all the answers

What type of plants can only flower in the inducing photoperiod?

Plants with an obligate response Signup and view all the answers

What is the term for the process by which plants measure time?

Circadian clock Signup and view all the answers

What is the importance of an animal's sensory system?

It detects signals from the environment and communicates them to the body Signup and view all the answers

What is the process of artificially exposing plants to low temperatures to stimulate flowering or enhance seed production?

Vernalization Signup and view all the answers