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6. A nitrogen deficiency in plants is often characterized by what symptom?
A. The young leaves become yellow.
B. The young leaves turn orange.
C. The old leaves turn yellow.
D. The old leaves turn orange.
7. Which statement about mycorrhizae is true?
A. They spread by way of plant seeds.
B. They form structures that do not need oxygen.
C. They increase the surface area of the roots.
D. They are found only in tropical species of plants ​

Sagot :

Elbertbelanigueidn

Answer:

6. C. The old leaves turn yellow.

The chlorophyll content of the plant leaves is reduced which results in pale yellow color (chlorosis). Older leaves turn completely yellow

7. C. They increase the surface area of the roots.

Mycorrhizae are a symbiotic association between plant roots and fungi. Their major role is to enhance nutrient and water uptake by the host plant by exploiting a larger volume of soil than roots alone can do. Mycorrhizae come in a number of forms, dependent upon both host plant and fungal taxonomy.