Question Video: Identifying and Explaining Why One Fertilizer Is More Effective Than Another Chemistry

Why is fertilizer (A) not as effective as fertilizer (B) at promoting plant growth? [A] Fertilizer (A) does not contain any sodium. [B] Fertilizer (B) inhibits seed germination. [C] Fertilizer (B) only contains nitrogen. [D] Fertilizer (A) does not contain any phosphorous or potassium. [E] Fertilizer (A) raises the pH of the soil.Fertilizer (A) is urea and fertilizer (B) is an NPK fertilizer.

02:54

Video Transcript

Why is fertilizer A not as effective as fertilizer B at promoting plant growth? (A) Fertilizer A does not contain any sodium. (B) Fertilizer B inhibits seed germination. (C) Fertilizer B only contains nitrogen. (D) Fertilizer A does not contain any phosphorous or potassium. (E) Fertilizer A raises the pH of the soil. Fertilizer A is urea and fertilizer B is an NPK fertilizer.

Fertilizers supply plants with essential nutrients they need to grow. These essential nutrients are the elements nitrogen, phosphorus, and potassium. That’s what this NPK in the NPK fertilizer stands for, the atomic symbols of these three elements. So since fertilizer B is an NPK fertilizer, it contains all of the essential nutrients we need to supply plants through fertilization. If we look at fertilizer A, urea, we can see that it does contain nitrogen, but it doesn’t contain phosphorous or potassium. In this question, we’re looking for the reason why fertilizer A is not as effective as fertilizer B. And what we just discussed about the elements that each fertilizer contains probably has something to do with it.

But let’s take a look through our answer choices. Answer choice (A) says that fertilizer A does not contain any sodium. This statement is true. Fertilizer A doesn’t contain any sodium, but neither does fertilizer B. That’s because sodium isn’t a nutrient that we need to supply plants through fertilization. So this isn’t the correct answer. Answer choice (B) says that fertilizer B inhibits seed germination. Nitrogen-containing fertilizers do inhibit seed germination. So you should take care not to apply too much nitrogen-containing fertilizer too close to one seed to germinate. But both fertilizer A and fertilizer B contain nitrogen. So this isn’t correct either.

Answer choice (C) says that fertilizer B contains only nitrogen. This statement is not true. Fertilizer B contains nitrogen, phosphorus, and potassium because it’s an NPK fertilizer. Answer choice (D) says that fertilizer A does not contain any phosphorous or potassium. This is true. Fertilizer A doesn’t contain any phosphorous or potassium, which are two of the three essential nutrients that we need to supply plants. So we found the correct answer. But let’s take a quick peek in answer choice (E). This one says that fertilizer A raises the pH of the soil. Fertilizer A, urea, does actually change the soil pH. But it slightly lowers the pH of the soil, not raises it. So, as we said, answer choice (D) is the correct answer. Fertilizer A is not as effective as fertilizer B because fertilizer A does not contain any phosphorous or potassium.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.