Flowering response of plants towards the period of light exposure is termed as?

KPSC Staff Nurse - 2015

General Knowledge

Easy

Appeared in: KPSC Staff Nurse - 2015

Explanation

Photoperiodism is the correct term for the physiological response of plants, specifically flowering, to the relative lengths of day and night.
This response is crucial for plants to flower at the appropriate season, ensuring successful pollination and seed production.
The mechanism involves photoreceptors in the plant (like phytochromes) that detect the length of the dark period, which is the actual trigger for flowering in many species.
Based on this response, plants are classified as short-day, long-day, or day-neutral.

Option A: Phototropism refers to the directional growth of a plant towards or away from a light source, not its flowering response to the duration of light.
Option B: Photoperiod is the term for the duration of light exposure itself (the day length). It is the environmental cue, not the biological response of the plant.
Option D: Photorespiration is a metabolic pathway related to photosynthesis that consumes oxygen and releases carbon dioxide. It has no direct role in controlling the timing of flowering.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Plant physiological response to light duration as background academic context rather than a clinical decision trigger.
Understanding photoperiodism is critical in agriculture and horticulture for controlling crop production.
Growers can manipulate the light environment in greenhouses (using artificial lighting or blackout cloths) to induce or delay flowering, allowing for year-round availability of certain flowers and fruits.
This knowledge helps in selecting crop varieties that are suitable for the day-length conditions of a specific geographical region.

How to Approach the Question

First, analyze the question to identify the core concept. The question asks for the specific term for a plant's 'flowering response' to the 'period of light exposure'.
Break down the options based on their root words. 'Tropism' relates to directional movement, 'period' refers to a duration of time, 'periodism' implies a response to a period, and 'respiration' is a metabolic process.
Differentiate between the stimulus and the response. The 'photoperiod' is the stimulus (the length of day), while the question asks for the term describing the 'response'.
Evaluate 'Photoperiodism'. This term combines 'photo' (light) and 'periodism' (response to a period), which directly matches the question's description of a response to the period of light.
Eliminate the other options. Phototropism is about direction, not duration. Photorespiration is a different biochemical process. Photoperiod is the cause, not the effect.
Conclude that Photoperiodism is the correct term for the physiological response of flowering to day length.

Concept Tested & Keywords

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E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) p. 3145-3147