ANIMAL BEHAVIOR
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A plant that flowers only after being exposed to light periods shorter than a certain critical length, as in early spring or fall
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A plant that flowers only after being exposed to light periods longer than a certain critical length, as in summer
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Detailed explanation-1: -In short day plants dark period is critical, whereas in long day plants light period is critical.
Detailed explanation-2: -A plant that requires a long period of darkness is termed a “short-day” (long-night) plant. Short-day plants form flowers only when day length is less than about 12 hours. Many spring-and fall-flowering plants are short-day plants, including chrysanthemums, poinsettias and Christmas cactus.
Detailed explanation-3: -This is how flower growers can control when their plants flower (and make sure they all flower on Valentines Day!). If growers want long day plants to flower, they simply interrupts the night with white or red light. If they want short day plants to flower, they place the flowers under far-red light.
Detailed explanation-4: -Thus, the correct answer is ‘Day neutral plants’.