HELP ME PLEASE I BEG YOU I RELLY NEED IT URGENT !!!! 15 points!

Biology

1 answer:

levacccp [35]3 years ago

5 0

The easiest example here is a computer/laptop... e.g. when the CD-ROM is spinning when you are perhaps playing a movie, the kinetic energy causes friction, which results in heat. All computers need a fan to prevent them over-heating for this very reason. Therefore heat is lost and energy is wasted.

Another example is a lightbulb. When a light is switched on and left for a long time, the current flowing through the filament (the thin bit of wire in the bulb) causes heating (due to electron-ion collisions but you may not need to know that) so energy is wasted as thermal energy instead of light energy.

These are just a few examples but other ones you could use are tv screens, kettles, toasters, etc :)

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Above 380C and below OoC the rate of photosynthesis decreases. Propose a hypothesis to explain why this occurs.

Effectus [21]

Answer:

Enzyme activity decrease at these temperatures. 

Explanation:

Photosynthesis is facilitated by the action of various enzymes and involves light and dark reactions. In light reactions chlorophyll absorbs sunlight and creates ATP AND NADPH. In dark reactions carbon is fixed using the ATP and NADPH. 

The efficiency of all these activities depends on the activity of enzymes which depends on the temperature. The optimum temperature range where the enzyme activity is optimal is about 10°c - 20°c. At low temperatures and high temperatures enzyme activity is less efficient.

At a temperature above 38°c and below 0°c enzyme activity decreases. 

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3 years ago

Animals marking their territory with urine is an example of?

Inessa05 [86]

Showing dominance over were ever they did that at

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3 years ago

An aqueous solution in which the concentrations of hydrogen and hydroxide ions are equal; it has a pH of 7.0.

Levart [38]

Yes, a PH of 7 is considered neutral.

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