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2 years ago

Explain how photoperiodism is critical to the survival and reproductive success of many plants.

1 answer:

5 0

Answer: Photoperiod controls many developmental responses in animals, plants and even fungi These mechanisms include the detection of the light signal in the leaves, the entrainment of circadian rhythms, and the production of a mobile signal which is transmitted throughout the plant.

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In an experiment, a certain colony of bacteria initially has a population of 50,000. A reading is taken every 2 hours, and at th

Iteru [2.4K]

Answer:

1) Recursive definition: $p_n = (50,000)3^n$

2) At the beginning of the 4th interval

Explanation:

The initial population of the bacteria at time zero is

$p_0 = 50,000$

Here we are told that the reading is taken every two hours; we call this time interval "n", so

$n=2 h$

And also, after every time interval n, the number of bacteria has tripled.

This means that when n = 1,

$p_1 = 3 p_0$

And when n=2,

$p_2 = 3 p_1 = 3(3p_0)=9 p_0$

Applied recursively, we get

$p_n = 3^n p_0$

And substituting p0,

$p_n = (50,000)3^n$ (1)

Here we want to find at the beginning of which interval there are

$p=1,350,000$

bacteria.

This means that we can rewrite eq.(1) as

$1,350,000=(50,000)3^n$

By simplifying,

$27=3^n$

Which means that

$n=3$

However, this means that the number of bacteria is 1,350,000 after 3 time intervals; therefore, at the beginning of the 4th interval.

8 0

2 years ago

A structure in the leg of a human is found to carry oxygen-rich red blood cells. What else is most likely true about this struct

Gwar [14]

Most likely to be A which is probably an artery which carries blood away from the heart Nd tens to carry oxygen rich blood

the leg doesnt contain aveoli this is found in the lungs so its not B
since its oxygen rich little carbon dioxide will be present in this structure so its not C
this part cant be part of the respiratory system as the respiratory system includes lungs, mouth and etc but not the legs so it cant be D

hope that helps

8 0

3 years ago

Read 2 more answers

Protists are classified into what three groups

Aleksandr-060686 [28]

<span>Protists are often classified by the characteristics that resemble those of fungi, plants, and animals</span>

7 0

3 years ago

Questions.<br> Questions<br> 1 a Name the microorganism which causes the disease smallpox.

valina [46]

Answer:

Variola virus.