Which of the following is true? ( a ) when plant is kept in sunlight ,photosynthesis and cellular respiration occurs. ( b ) when plant is kept in sunlight ,only photosynthesis occurs (c ) when plant is kept in dark place ,photosynthesis &cellular respiration don't occur
Photosynthesis occurs only in light.The question I have for you is, what does light have to do with cellular respiration?
Look up cellular respiration.
To determine which of the given statements is true, we need to understand the processes of photosynthesis and cellular respiration in plants.
Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into glucose and oxygen. This process occurs in the chloroplasts of plant cells and requires sunlight. The chemical equation for photosynthesis is:
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2
Cellular respiration, on the other hand, is the process by which organisms break down glucose to produce energy in the form of ATP (adenosine triphosphate). In plants, cellular respiration occurs in the mitochondria of plant cells. The chemical equation for cellular respiration is:
C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP
Now, let's evaluate each statement:
(a) When a plant is kept in sunlight, photosynthesis and cellular respiration occur.
This statement is true. In the presence of sunlight, plants undergo photosynthesis to produce glucose and oxygen, and they also perform cellular respiration to convert glucose into energy.
(b) When a plant is kept in sunlight, only photosynthesis occurs.
This statement is not true. While photosynthesis is the primary process that occurs in the presence of sunlight, cellular respiration also takes place simultaneously.
(c) When a plant is kept in a dark place, photosynthesis and cellular respiration don't occur.
This statement is partially true. In the absence of sunlight, plants cannot perform photosynthesis. However, cellular respiration can still occur since it does not require sunlight. During cellular respiration, plants break down stored glucose molecules to produce ATP, even without the presence of light.
In conclusion, statement (a) is the most accurate. When a plant is kept in sunlight, both photosynthesis and cellular respiration occur.