What structure most directly stimulates a skeletal muscle fiber to contract?

The right answer is motor neuron.

A motor neuron is a nerve cell that is directly connected to a muscle and controls its contraction. Motor neurons are the exit route from the central nervous system or the final route of any motor act. The cellular bodies of the motor neurons are located either in the brainstem or in the ventral horn of the gray matter of the spinal cord.

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.