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nika2105 [10]
3 years ago
15

Two test tubes are filled with a solution of bromthymol blue. A student exhales through a straw into each tube, and the bromthym

ol blue turns yellow. An aquatic green plant is placed in each tube, and the tubes are corked. One tube is placed in the dark, and the other tube is placed in direct sunlight. The yellow solution in the tube in sunlight turns blue, while the one in the dark remains yellow. Which statement best explains why the solution in the tube placed in sunlight returns to a blue color?a) Carbon dioxide was produced by respiration.b) Carbon dioxide was removed by photosynthesis.c) Oxygen was produced by photosynthesis.d) Oxygen was removed by respiration.
Biology
2 answers:
gregori [183]3 years ago
8 0

Answer:

The plant is photosynthesizing and using up the CO2.

Anika [276]3 years ago
4 0

Answer:

Option B

Explanation:

 

When Bromthymol blue (BTB) receives carbon dioxide (after a student exhales into it), turns yellow. This yellow color is due to the formation of slightly acidic carbonic acid. Now,  an aquatic green plant is placed in both the test tubes and one of these test tube is placed in sunlight. Thus, the test tube kept in sun has all ideal requirements  that would allow the plant to photosynthesize. Photosynthesis process removes carbon dioxide from the test tube and hence it apperas blue again. While the test tube in dark still appears yellow in color

Hence, option B is correct

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Answer:

the humus contains the minerals necessary for chlorophyll synthesis

Explanation:

<em>The yellowness of leaves in plants can be attributed to inadequate chlorophyll in the plant</em>. The chlorophyll is responsible for the greenness appearance of the leaves of plants and when it is present in inadequate quantity, the leaves appear yellowish in color.

<u>Some of the minerals necessary for the formation of chlorophyll include magnesium, nitrogen, and iron</u>. It thus means that the humus supplied to the soil of group 1 plant has the necessary minerals to synthesize chlorophyll while the soil of group 2 plants is deficient in some or all the minerals required for chlorophyll synthesis.

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3 years ago
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mariarad [96]

Answer:

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Explanation:

3 0
3 years ago
Which blood type can be transfused into a patient who has blood type A–?
Oksana_A [137]

For a person with blood type A- (A negative),  they can be transfused with either  blood type A negative  , or blood type O negative.

This is because any other blood type will immediately be rejected by their body.

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Therefore because of the rhesus negative factor, a person with blood type A negative  can only be transfused with rhesus negative .


8 0
3 years ago
A 58 year old lawyer presents in the emergency room with headache, irritability, generalized muscle pain and uncontrollable back
Lerok [7]

Answer:

A. What is your diagnosis here?

As per symptoms and incident of puncturing left arm with nail from an old barn indicates it can be infection of Clostridium tetani causing disease tetanus.

When such kinds of wound occurs, there should be injection of tetanus immunoglobulin (TIG) immediately. This injection contains antibodies against Clostridium tetani which can kill the microorganism. It should be injected as soon as possible. But this is short term immediate medication.

B. What is the proper treatment of this problem?

For the treatment antibiotic penicillin, metronidazole or tetracycline can be given, it prevents multiplication of bacteria and production of neurotoxin from bacteria. these neurotoxins are responsible for muscular spasms. Along with antibiotic some anticonvasculants, muscle relaxants can be given to reduce spasms, anxiety.

C. How could this have been prevented?

This infection can be prevented by giving its vaccine in childhood itself. Vaccine is given in the form of DTaP vaccine (diptheria, tetanus toxoid, acellular pertusis). It is given in 5 shots. It is given in the arm or thigh when child is at 2 month age, 4 month age, 6 month age, 15 to 18 month age, 4- 6 years of age.

Explanation:

4 0
3 years ago
PLS HELP
slavikrds [6]

Answer:

lava flows are very hot, thin and runny. When it cools is has a smooth to ropey texture because of the low silica content which makes it cool quickly. Pahoehoe flows creep along generally at less than 3 feet per minute but some flows have been measured at over 20 miles per hour.

Explanation:

it is A

8 0
3 years ago
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