The answer would be A.
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Answer:
Enzyme catalase is affected by high temperatures
Explanation:
Enzymes are organic catalysts which are protein in nature therefore they are sensitive to changes in temperature. Most enzymes have an optimum range of temperature between 35-40°c.
As temperature is increased, the optimum temperature is reached where the rate of reaction is maximum. When beef liver is boiled, hydrogen peroxide is not broken down because higher temperatures denature enzymes making them non effective.
Answer:
Option-D
Explanation:
A plant leaf is a photosynthetic organ of the plant which contains the chlorophyll pigment. The plants have the ability to form new leaves or young leaves when the older leaves shed away.
The younger and older plant leaves can be distinguished on the basis of their color.
The younger leaves as they grow to appear darker due to the presence of higher number of chlorophyll pigments which imparts green color. But as the leaves got older, the color of the leaves changes to yellow as they necrosis leads to the death of the leaves and the anthocyanin pigment imparts yellow color.
Thus, Option-D is the correct answer.
