Phototropism exam Flashcards

Growth of a plant towards or away from light.

Auxin facilitates growth towards light by creating asymmetric growth patterns.

Photoreceptors that detect red and far-red light, influencing processes like flowering and circadian rhythms.

Plants use photoreceptors such as phytochromes and cryptochromes to detect light wavelengths.

Plant growth in response to different spectrums of light.

It explains how auxin causes cell elongation by pumping protons into the cell wall, allowing water to enter and expand the cell.

Plant responses to the absence of sunlight, such as growing towards the sun and having longer internodes.

Photoreceptors that detect blue light and influence circadian rhythms in plants.

Blue light photoreceptors involved in phototropism and stomata opening and closing.

Phytochromes detect far-red light, causing plants to lengthen stems or induce branching to grow into direct light.

The process by which a signal is carried through the cell, leading to a response.

It states that auxin moves from the light side to the shade side of the plant, causing asymmetric growth.

Physiological responses of plants to the lengths of day and night.

A pretreatment with cold necessary for some plants to bloom in response to photoperiod.

The hypothetical hormone believed to induce flowering in plants.

Intracellular signaling molecules that carry the signal within the cell.

A lack of chlorophyll in plants, often due to an absence of sunlight.

Proteins that loosen hydrogen bonds in cellulose, allowing water to enter the cell wall.

Daily cycles in plants that influence hormone concentration and other physiological processes.

A mechanism where phytochromes switch between forms in response to red and far-red light, helping plants detect light and shade.

A plant hormone responsible for growth towards light and other functions.

Photoreceptors detect light and initiate the growth response towards or away from it.

The arrangement of leaves on a stem.

Hormones affect gene expression, cell division, and growth, mediating plant responses to environmental stimuli.

The phenomenon where the central stem of the plant is dominant over other side stems.

Proton pumps concentrate protons in the cell wall, leading to water entry and cell elongation.

Proteins that respond to light and initiate plant responses.

Blue light is detected by phototropins and is crucial for phototropism and photosynthesis.

A process where a few signaling molecules have a large effect, amplifying the signal.