Question

1. In commercial crop production, growers often plant large quantities of just a few plant varieties. What is a major problem associated with this practice?

		a. This practice decreases the efficiency of local insect-driven pollination.
		b. This practice decreases the nutritional quality of subsequent crop yields.
		c. This practice increases the chances that disease will decimate global crop yields.
		d. This practice interferes with the normal course of natural selection.
		e. This practice increases the chances that a genetic mutation will occur.

1. When sac fungi that grow as molds reproduce asexually, they _____.

		a. form buds with a small amount of cytoplasm and no nucleus
		b. produce spores by meiosis at the tips of specialized hyphae
		c. form buds one nucleus and a small amount of cytoplasm
		d. form dikaryotic buds with a small amount of cytoplasm
		e. produce spores by mitosis at the tips of specialized hyphae

1. Powdery mildews (sac fungi) and rusts and smuts (club fungi) lead to the demise of plants by _____.

		a. decreasing carbon dioxide levels
		b. inhibiting the function of chloroplasts
		c. depleting the plant of nutrients
		d. producing toxic levels of carbon monoxide
		e. increasing oxygen levels

Answer 1

1. The practice increase the chances of disease will decimate the global crop yield is correct option.

Explanation : Because due to growing a same kind of a crop in large population the disease will be spreading fastly and destroying all the crops if there are many varieties they may be decrease of spread because disease of.plants may be host specific.

2.Produce spores by meiosis at the tip of specialized hyphae is correct option.

Explanation : asexual reproduction is done by formation of spores that is conidia formed form the hyphae and the spores are formed usually by meiosis.

3.Depleting the plant nutrients is the correct option.

Explanation : As these fungi cause disease to the leaf which appear outside like a powdery substances ,where mildew appear as a dry white powder and Smuts like black powder. They reproduce by forming spores taking all the nutrients from the leaves these causes drying and shedding of leaves from plant.