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Question
Growth is primarily affected by two climatic factors which are
Growth is primarily affected by two climatic factors which are
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Solution
The correct option is A light and temperature
Growth of an organism involves the processes of increased protoplasm synthesis, cell division, cell enlargement and cell differentiation. So, all the factors influencing the biosynthetic machinery like, the availability of O2, H2O, optimum light and temperature, minerals (both macro and micro) and absence of stress conditions, also affect growth of an organism.
Light and temperature are the primary climatic factors that affect the plant growth. Light is required for tissue differentiation, synthesis of photosynthetic pigments and photosynthesis. Its absence results in etiolation (when plants are grown in partial or complete absence of light, they develop long and weak stems, and smaller leaves with a pale color).
Light also influences certain stages of growth. The phenomenon is called photoperiodism. A temperature of 28℃-30℃ is optimum for the proper growth in most plants.
Higher temperature above 45℃ hinders growth due to excessive transpiration, denaturation of enzymes and coagulation of protoplasm. Lower temperature inactivates enzymes and also increases the density of protoplasm.
Other climatic factors that affect plant growth are humidity, rainfall and wind.
Wind affects the sturdy growth of plants and dry wind can cause desiccation.
Soil is a major determinant of plant growth, but it is not a climatic factor. Soil is the medium that provides water, minerals and nutrients required for plant growth.
Soil nitrogen is an essential nutrient that is very important for plant metabolism and growth. It is not a climatic factor.
Humidity is a climatic factor that affects the rate of transpiration and influcences the water status of the plants, hence affects growth. Phytohormones impact the plant growth significantly in various ways, but they are intrinsic factors, not climatic factors.
Growth of an organism involves the processes of increased protoplasm synthesis, cell division, cell enlargement and cell differentiation. So, all the factors influencing the biosynthetic machinery like, the availability of O2, H2O, optimum light and temperature, minerals (both macro and micro) and absence of stress conditions, also affect growth of an organism.
Light and temperature are the primary climatic factors that affect the plant growth. Light is required for tissue differentiation, synthesis of photosynthetic pigments and photosynthesis. Its absence results in etiolation (when plants are grown in partial or complete absence of light, they develop long and weak stems, and smaller leaves with a pale color).
Light also influences certain stages of growth. The phenomenon is called photoperiodism. A temperature of 28℃-30℃ is optimum for the proper growth in most plants.
Higher temperature above 45℃ hinders growth due to excessive transpiration, denaturation of enzymes and coagulation of protoplasm. Lower temperature inactivates enzymes and also increases the density of protoplasm.
Other climatic factors that affect plant growth are humidity, rainfall and wind.
Wind affects the sturdy growth of plants and dry wind can cause desiccation.
Soil is a major determinant of plant growth, but it is not a climatic factor. Soil is the medium that provides water, minerals and nutrients required for plant growth.
Soil nitrogen is an essential nutrient that is very important for plant metabolism and growth. It is not a climatic factor.
Humidity is a climatic factor that affects the rate of transpiration and influcences the water status of the plants, hence affects growth. Phytohormones impact the plant growth significantly in various ways, but they are intrinsic factors, not climatic factors.
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