Question

A plant which needs , not less than 10 hours of light to flower is
A.Long day plant
B.Short Day plant
C.Day neutral plant
D.None of the above

Answer 1

One of the most critical variables for rising houseplants is light. For photosynthesis, all plants need light, a process within a plant that transforms light, oxygen and water into carbohydrates (energy). A plant needs this much-needed energy in order to grow, bloom and produce seeds.

Complete answer:
You need to get a handle on "photoperiodism," or the amount of light and darkness a plant is subjected to in order to understand plant flowering. The amount of uninterrupted darkness on most types of plants determines the development of flowers.

The "short day" (long night) plant is considered a plant that needs a long period of darkness. Short-day plants only grow flowers when the length of the day is less than around 12 hours. Short-day trees, including chrysanthemums, poinsettias and Christmas cactus, are many spring and fall flowering plants. Bloom formation does not occur if they are exposed to more than 12 hours of light a day.
Some plants need flowering for just a short night. These are called the plants of the "long day" These bloom only when more than 12 hours of light is given to them. Long-day herbs, such as asters, coneflowers, California poppies, lettuce, spinach and potatoes, are many of our summer flowering flowers and garden vegetables. All of these, during our temperate summers, bloom when the days are long.

And some trees, regardless of the duration of the day, form flowers. These are considered 'day neutral' plants by botanists. Tomatoes, maize, cucumbers and some strawberries are neutral for the day.

Hence, the correct answer is option (A)

Note: There is another division within each group of long-day or short-day plants that places certain plants into two smaller groups: qualitative or quantitative plants. These are plants that need a certain number of nights or days for a particular task to be carried out. For instance, to make the bracts turn red, poinsettias (Euphorbia pulcherrima) need a set number of nighttime hours. This is regarded as a plant that is qualitative. If the light and dark hours are reached or not, a quantitative plant may flower or bear fruit.