What are two principal criteria by which an element can be judged essential to any plant?

What will be an ideal response?


• An element is essential if the plant cannot complete its life cycle (forming viable
seeds) in the absence of that element.
• An element is essential if it forms part of any molecule or constituent of the plant that
itself is essential in the plant; for example, magnesium is an integral part of chlorophyll.

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Which of the following is the term for the rate at which torque is produced.

A. Foot-pounds B. Newton-meters C. Energy D. Horsepower

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For a spot speed study in which 100 observations were obtained, the mean speed was 52 mi/h and the standard deviation was 4.6 mi/h. What is the margin of error on the estimate of true mean speed obtained from this sample? What is a reasonable estimate of the 85th percentile speed based on the information available?

What will be an ideal response?

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When a dimension is underlined, it means that the part has other interchangeable parts available.

Answer the following statement true (T) or false (F)

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The ozone layer is in which of earth's atmospheric layers?

A) Stratosphere B) Mesosphere C) Thermosphere D) None of these is correct

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