Question Video: Recalling Examples of Macronutrients Required by Plants | Nagwa Question Video: Recalling Examples of Macronutrients Required by Plants | Nagwa

Question Video: Recalling Examples of Macronutrients Required by Plants Biology • Second Year of Secondary School

Fill in the blank: Calcium, carbon, and magnesium are _ required by plants.


Video Transcript

Fill in the blank. Calcium, carbon, and magnesium are blank required by plants. (A) Micronutrients, (B) macronutrients, or (C) both macronutrients and micronutrients.

All living organisms, including plants, require some form of nutrition in order to survive. Nutrients can be divided into two major groups: macronutrients and micronutrients.

Macronutrients are those that the plant needs in large quantities. In fact, the prefix macro- derives from the Greek word that means large. The biological molecules within the cells of all living things are largely made up of three key elements: carbon, hydrogen, and oxygen.

For example, the carbohydrates that are mainly used in cells to release energy through cellular respiration are made up exclusively of these three elements. Lipids and proteins also both contain large proportions of carbon, hydrogen, and oxygen.

There are several other macronutrients that are usually required by plants in large quantities. For instance, magnesium is a key component of chlorophyll, the main pigment found in the chloroplasts of most green plants. Chlorophyll and other photosynthetic pigments absorb light energy, which is required for photosynthesis. As photosynthesis is how a plant makes its food, magnesium is required in its photosynthetic cells in considerable amounts.

Calcium is another important macronutrient in plants as it plays a key structural role in plant cell walls and cell membranes. Some other nutrients that plants often require in large quantities are nitrogen, phosphorus, potassium, and sulfur.

Micronutrients, on the other hand, are elements that are needed in smaller quantities, no more than a few milligrams per liter. We can remember this, as the prefix micro- means small. Most micronutrients act as cofactors in enzymatic reactions. Cofactors are nonprotein components of enzymes which help the enzyme to catalyze a specific chemical reaction. As you can see, when the cofactor binds to the enzyme, it allows the substrates to bind more easily.

An example of a micronutrient that can be used in plant cells as a cofactor is iron, which plays an important role in cellular respiration among other vital processes. Some other examples of micronutrients required by plants often include manganese, zinc, boron, chlorine, copper, and molybdenum.

However, this question is asking us to determine which group of nutrients calcium, carbon, and magnesium belong to. And now we know the correct answer to this question. Calcium, carbon, and magnesium are all examples of (B), macronutrients.

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