Plant Responses to Time Quiz

What are photoperiodic responses in plants controlled by?

• Internal clock

• External temperature

• Soil nutrients

• Water availability

Which process occurs only during the day in plants?

• Leaf movement

• Biochemical processes like photosynthesis

• Stem growth

• Production of hormones

What is the main benefit of leaf drooping at night?

• Increased photosynthesis

• Reduced water loss

• Enhanced nutrient absorption

• Better pollination

What is the term for plant rhythms that occur annually?

• Circatidal rhythms

• Circadian rhythms

• Photoperiodic rhythms

• Circannual rhythms

Which pigment is responsible for detecting light wavelengths in plants?

• Chlorophyll

• Anthocyanins

• Carotenoids

• Phytochrome

What type of plants require a long day and short night to flower?

• Short-day plants

• Day-neutral plants

• Long-day plants

• Nocturnal plants

Which hormone is hypothesized to promote flowering in plants?

• Auxin

• Gibberellin

• Florigen

• Cytokinin

What happens to Pfr during the night?

• It accumulates

• It is converted to Pr

• It remains unchanged

• It activates flowering

Which type of plants flower when the night period exceeds a critical length?

• Long-day plants

• Day-neutral plants

• Short-day plants

• Nocturnal plants

What is the critical factor for plants to calculate the time of year?

• Day length

• Night length

• Soil moisture

• Temperature