As with any other enzyme-controlled reaction, the rate of photosynthesis is affected by temperature. At low temperatures, the rate of photosynthesis is limited by the number of molecular collisions between enzymes and substrates. At high temperatures, enzymes are denatured .

Under high-temperature conditions, the rate of photosynthesis decreases. This is because photosynthesis is an enzyme-mediated reaction. These enzymes work effectively under optimum temperature conditions. When the temperature range increases the optimum value, the process gets affected.

Green plants show a variety of strategies for doing photosynthesis during the winter. Winter days are shorter with reduced light. Other EVERGREEN plants lose and replace their needles or leaves simultaneously in winter so we don’t notice the change. Photosynthesis goes on more slowly in these trees and plants.

Chilling temperatures can limit photosynthesis via stomatal closure, inhibition of thylakoid electron transport and photophosphorylation, inhibition of key enzymes in sucrose and starch biosynthesis, Rubisco inactivation and limitation of sink strength and phloem loading (Allen & Ort 2001).

Low Temperature At low temperatures, between 32 and 50 degrees Fahrenheit – 0 and 10 degrees Celsius – the enzymes that carry out photosynthesis do not work efficiently, and this decreases the photosynthetic rate. This leads to a decrease in glucose production and will result in stunted growth.

The optimum temperature range for photosynthesis is 35–40ºC.

Three factors can limit the rate of photosynthesis: light intensity, carbon dioxide concentration and temperature.

Complete answer: Typically, in blue and red light, plants exhibit a high rate of photosynthesis. In red light, maximum photosynthesis was observed, rather than in blue light.

To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight.

Why Do Plants Need Sunlight to Grow? Without getting too deep into the science, sun-light is a key energy source for all plants. Through a process called photosynthesis, plants absorb energy from the sun, which fuels the processes necessary for survival.

The presence of specific features or certain habits, which enable a plant or an animal to live in its surroundings, is called adaptation. Different animals are adapted to their surroundings in different ways. Adaptation does not take place in a short time.

The presence of specific body features (or certain habits) which enable an animal or a plant to live in a particular habitat (or surroundings) is called adaptation. The body features and habits that help animals (and plants) to adapt to their particular habitats or surroundings are a result of the process of evolution.

An adaptation is any heritable trait that helps an organism, such as a plant or animal, survive and reproduce in its environment.

Adaptation is the evolutionary process where an organism becomes better suited to its habitat. An example is the adaptation of horses’ teeth to grinding grass. Grass is their usual food; it wears the teeth down, but horses’ teeth continue to grow during life.

The day- to-day condition of the atmosphere at a place with respect to the temperature, humidity, rainfall, wind- speed, etc., is called the weather at that place. The temperature, humidity, and other factors are called the elements of the weather. The weather of a place changes day after day and week after week.

Weather is the day-to-day state of the atmosphere, and its short-term variation in minutes to weeks. People generally think of weather as the combination of temperature, humidity, precipitation, cloudiness, visibility, and wind.

(i) The average weather taken over a long time is called climate. (ii) A place receives very little rainfall, and the temperature is high throughout the year, the climate of that place will be hot and dry. (iii) The two regions of the earth with extreme climatic conditions are polar region and tropical region.

“Why does the rate of photosynthesis decrease at higher temperatures ?” Photosynthesis is an enzyme specific process. All enzymes act at an optimum temperature ( i.e. 25-35∘C). If temperature increases, enzyme get denature, thus leadin to fall in the rate of photosynthesis.

Hence if the temperature is increased to more than 35oC there will be a decline in the rate of photosynthesis due to denaturation of carbon fixing enzymes. Similarly, at very high temperatures, the rate of respiration also falls significantly.

If the rate of respiration is higher than the rate of photosynthesis then the plant will be starving more because the higher rate of respiration leads to more consumption of the oxygen.

Why does the rate of photosynthesis increase, peak, and then decrease as temperature increases? The stomata starts to close, which causes the rate of photosynthesis to peak and then decrease. The stomata would open because it would allow for more CO2 to enter the leaf from surrounding air, causing photosynthesis.

The reason the rate of photosynthesis increased when the temperature was at 30 degrees Celsius is because the enzyme activity of RUBISCO increased. When the temperature was hot or cold, the amount of oxygen produced was lower because the enzyme activity declined.

The correct option is C as it shows the increase in rate of reaction with increasing temperature up to a point.

Increase in temperature would result in the increase of kinetic energy which increases the motion of molecules of matter and vice-versa. Hence, the correct representation will be Graph 3.

When the temperature rises the rate of photosynthesis rises also. There is an optimum temperature at which the rate of photosynthesis is maximum. Beyond this temperature, the reaction quickly comes to a halt. Place a pond weed Elodea upside in a test tube containing water at 25°C.

(ii) The rate of photosynthesis was greatest at 12 noon as the amount of carbon dioxide taken in was greatest at that time.