19. Which of the following is the best strategy to control wheat rust?

Biology

1 answer:

valentinak56 [21]2 years ago

8 0

Answer:

B. Fungicides to treat affected crops and planting rust-resistant varieties

Explanation:

Leaf rust is a disease caused by the fungus Puccinia triticina which affects leaves, stems and grains in wheat and related cereals (i.e., barley and rye). This disease is known to affect crops in moist conditions. Leaf rust disease is spread through fungi spores from infected wheat plants to healthy plants. Recently, leaf rust-resistant varieties have been developed by crop improvement programs aimed at introducing leaf rust-resistant (lr) genes involved in resistance against this important crop disease. Moreover, there are different types of fungicides (e.g., Prothioconazole and Tebuconazole) used for chemical control of this disease.

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Which have scientists learned from studying seismic waves that travel through earth’s interior?

DENIUS [597]

D. They have learned the precise depths where the boundaries between the earth's layers are located.

The overwhelming amount of seismic activity particularly happens along convergent plate boundaries. In particular, reverse or thrust faults occurs on convergent plate boundaries.Converging plate boundaries are classified into two types of activities.First is the subduction boundary where the oceanic lithosphere is pressured beneath a continental plate or oceanic plate thus it overrides the other plate then slowly directed to the mantle where it will become a magma. Second is the collisional boundary where earthquakes occur because of the continental crust squeezed together then plates are pushed upwards.Reverse faults are correlated to earthquakes with magnitude of 8 or more.Hence, earthquakes of magnitude 8 or more are considered powerful and mega thrust earthquakes.

5 0

2 years ago

The collapse of fisheries is most noticeable among the smaller fish that are consumed by larger predatory fish, such as sharks a

kakasveta [241]

Answer:

The correct answer is: False.

Explanation:

A Fishery collapse can be defined as the condition in which the composition of different species of fishes forming a food chain or a food web and located in a marine or aquatic community undergoes a drastic alteration.
The alternation can be caused due to environmental or anthropological factors.
A fishery collapse usually affects the larger fish population like sharks and tuna as their commercial and economic demand is higher.
Excessive fishing cause the population of the large fishes to decline without affecting the small fish population.
This is because the small fishes do not have high economic or commercial demand, hence they have very less probability of being angled or captured.