Two groups of tomatoes were grown under laboratory conditions, one with humus added to the soil and one as a control without humus. The leaves of the plants grown without humus were yellowish (less green) compared with those of the plants grown in humus-enriched soil. The best explanation is that
a. The healthy plants used the food in the decomposing leaves of the humus for energy to make chlorophyll.
b. The humus made the soil more loosely packed, so water penetrated more easily to the roots.
c. The humus contained minerals such as magnesium and iron needed for the synthesis of chlorophyll.
d. The heat released by the decomposing leaves of the humus caused more rapid growth and chlorophyll synthesis.

Question

Two groups of tomatoes were grown under laboratory conditions, one with humus added to the soil and one as a control without humus. The leaves of the plants grown without humus were yellowish (less green) compared with those of the plants grown in humus-enriched soil. The best explanation is that

a. The healthy plants used the food in the decomposing leaves of the humus for energy to make chlorophyll.

b. The humus made the soil more loosely packed, so water penetrated more easily to the roots.

c. The humus contained minerals such as magnesium and iron needed for the synthesis of chlorophyll.

d. The heat released by the decomposing leaves of the humus caused more rapid growth and chlorophyll synthesis.

Accepted Answer

Hello everyone. And in today's video we have the following problem. The plants grown in soil rich with hummus show dark green leaves, while plants grown in soil without hummus show yellow tone leaves. All of the following statements regarding these two groups of plants are true except And so to solve this problem, we're only going to be using this statement before the question. The fact that plants that grow in soil rich with HMOs have dark green leaves and plants that grow in soil that is without us have yellow tone leaves. So now let's use these two relationships in order to solve the problems started with answer choice, A plants that have grown in Hamas rich soil, get nutrients necessary for chlorophyll development. This chlorophyll is going to be the pigment that gives plants their dark green color. So it's answer choice is actually going to be correct and we cannot eliminate it. It is not the exception that we're looking for according to the question because as we can see here these hormones allows the plant to have a dark green color. And the reason is that they allow for chlorophyll development. So we're going to move on to our next answer choice plants that have grown in homage free soil failed to develop chlorophyll. Well, again, this chlorophyll is a green pigment in plants, so we're going to highlight it again. And as we can see here these plants that grow in soil without humans have yellow tone leaves so they fail to develop chlorophyll which allows them to have a green color. So they have a yellow color instead. So it's actually correct as well. And we can move on to answer choice. C the Hamas contain minerals such as magnesium and iron needed for the synthesis of chlorophyll is actually correct as well. We need these minerals to develop chlorophyll in order for the plants to have a green color. So the Hamas allow the plants to obtain these men. And so these all lives with answer choice. D the Hamas made the soil more loosely packed so water penetrated more easily to the roots. Looking or statement up here. There is nothing really stating that. The reason why these are the relationship between the plants and the homeless depended on water penetration. So we're going to highlight this statement as being the exception. This is not really what how this relationship is taking place and it's going to be our final answer. Thank you very much for sticking around until the end of this video. I really hope it helped you

Verified video answer for a similar problem:

Key Concepts

Chlorophyll Synthesis

Role of Humus in Soil

Nutrient Availability and Plant Health