Question

a group of ecologists led by axel mithöfer at the max planck institute for chemical ecology in germany examined the defensive responses of two varieties of the sweet potato - t1157, which is known for its insect resistance, and t1416, which is much more susceptible to pests. which choice completes the text so that it conforms to the conventions of standard english? choose 1 answer

Explanation:

The context is about two varieties of a single type of plant (sweet - potato), so the singular form 'plant' is appropriate. Using the plural 'plants' would imply multiple types of plants, which is not the case here.

Answer:

plant