Question

Immediate source of energy is
A.Sucrose
B.Glucose
C.Fat
D.Starch

Answer 1

Carbohydrates are a key source of energy for both animals and plants. Plants generate carbohydrates using light energy from the sun (photosynthesis), whereas mammals get carbs by eating plants or other animals. Plants store carbs as starch, which are long polysaccharide chains, but mammals store carbohydrates as glycogen, which is a molecule. Because these big polysaccharides have a lot of chemical linkages, they can store a lot of chemical energy. When these molecules are broken down during metabolism, the energy contained in their chemical bonds is released, which may then be used to power cellular functions.

Complete answer:
Any monosaccharide (simple sugar) metabolism can provide energy for the organism to utilise. Excess carbohydrates are stored in plants as starch and in animals as glycogen, ready for metabolism if the organism's energy demands unexpectedly surge. When an organism's energy demands rise, carbohydrates are broken down into monosaccharides, which are subsequently dispersed to all of the organism's live cells. Monosaccharides like glucose (${C_6}{H_{12}}{O_6}$) are commonly utilised for energy generation. Each sugar molecule is broken down inside the cell by a complicated sequence of chemical processes. The chemical energy produced from the monosaccharide's bonds is used to make high-energy adenosine triphosphate (ATP) molecules. All cells use ATP as their major source of energy. Cells employ ATP molecules to do immediate labour and power chemical processes, similar to how the dollar is used to buy things.
Cellular respiration is the breakdown of glucose during metabolism and is defined by the equation:
${C_6}{H_{12}}{O_6} + 6{O_2} \to 6C{O_2} + 6{H_2}O + energy$

Hence option b is correct.

Note:
Glucose is a monosaccharide that provides energy immediately. The glucose in the blood is carried to the cell. Inside the cell, aerobic respiration swiftly breaks down glucose to produce energy in the form of ATP. Before sucrose and starch can be digested for energy, they must first be broken down into individual monomers. Despite the fact that lipids provide more energy than carbohydrates, fat breakdown takes time. As a result, option B is the right response.