Bromothymol blue (BTB) is a chemical indicator for carbon dioxide (CO2). In the presence of carbon dioxide (CO2), BTB turns from blue to yellow. An aquatic plant was placed into two test tubes containing BTB, and the test tubes were closed with a stopper. Then, one test tube was placed in the dark, and the other test tube was placed in direct sunlight. The test tube in sunlight stayed blue indicating no CO2 was present, while the test tube in the dark changed to yellow. Which statement best explains why the solution in the test tube placed in the dark changed to yellow?

Answers

Answer 1

Answer:

Explanation:

Although no options was given, the explanation below should give detail explanation.

The Chemical  reactants(  internal factors) for the process of photosynthesis are C02 and H20, and enzymes. Other external factors  are sunlight and chlorophyll.Therefore for a plant to undergo photosynthesis these reactants must be present in the presence of sunlight.

In the present scenario the plant in the test tube exposed to sunlight must used up the C02  with water and exposed sunlight to produce O2 -the by products and  CHO,Protein and Lipids in plants.

Since the C02 has  metabolised,no CO2 would be present in the test tube  of the plant and the water, hence BTB is negative,blue- no C02.

However,the plants in the dark lacks  the supply  of  sunlight therefore no photosynthesis could occur.Consequentially the C02 is not metabolized,and its concentration is high in the leaf in the test tube placed in the dark.This is indicated as yellow positive by the BTB which change from Blue to yellow.


Related Questions

What is the role of Cdks? to create enzymes that produce chemical changes to signal the cell to move to the next phase of the cell cycle build structural components of DNA and energy-rich substances to activate the cyclins that cause progression of the cell cycle

Answers

Answer:to signal the cell to move to the next phase of the cell cycle

Explanation:

(Just took it)

Answer:

The answer is B. to signal the cell to move to the next phase of the cell cycle

Explanation:

Most plants grow in the A horizon true or false​

Answers

Answer: True

Explanation: A HORIZON- This is the layer that we call "topsoil" and it is located just below the O Horizon. This layer is made up of minerals and decomposed organic matter and it is also very dark in color. This is the layer that many plants roots grow in.A HORIZON- This is the layer that we call "topsoil" and it is located just below the O Horizon. This layer is made up of minerals and decomposed organic matter and it is also very dark in color. This is the layer that many plants roots grow in.

Hope this helps

True Took the test about this :D

Which best describes the mantle?

A. molten metal
B. dense, solid metal ball
C. hot but solid rock
D. dry land and ocean floor

Answers

Answer:

C. hot but solid rock

Explanation:

solute concentration in the environment is higher than the solute concentration in the cell

Answers

Answer:

hypotonic

Explanation:

Xylem tissue and phloem tissue make up a plant's transport system, A. true B. false​

Answers

Answer:

true.

Explanation:

does anyone know the answer i really dont get it

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Answer:

Depending on the way it is I believe it should be organ system the way I'm used to listing it.

Explanation:

It could be different though.

(100 points) Can someone help me? (i am EXTREMELY confused ;c)


(idk if I can give brainliest so here's a fat bumblebee :D) (ignore the website part if u want). i got a dog to feed bruv

Answers

all you have to do is go on the website and look for the definitions of those words

The energy in glucose cannot be released by
respiration
glycolysis
burning
photosynthesis

Answers

Answer: Photosynthesis

The energy in glucose cannot be released by photosynthesis.

How Can the energy in glucose be released by photosynthesis?

During photosynthesis, “producers” like green plants, algae and some bacteria convert light energy from the sun into chemical energy. Photosynthesis produces chemical energy in the form of glucose, carbohydrate or sugar.

Thus, photosynthesis is the correct option.

To learn more about photosynthesis click here:

https://brainly.com/question/1388366

does vaccine use weak and dead pohthogen​

Answers

Answer:

yes

Explanation:

A: No, vaccines do not use weak and dead pathogen.

A2: Some vaccines do use those substances but are unapproved.

Most unapproved vaccines are illegal & not approved by CDC or the government. So no, they do not include those,

Which of the following is the most likely function of this shape?

Answers

A, it has flexible branches to help cope with heavy snow fall

Which type of plane would best separate the nose from the rest of the head?
1. sagittal
2. frontal
3. transverse
4. oblique

Answers

The answer is frontal
Option 2

SOMEONE PLEASE HELP!!!
Which pattern of inheritance are there more than 2 options for alleles but you can only inherit 2 of them at a time?


Complete Dominance


Codominance


Polygenic Trait


Multiple Alleles


Epistasis


Incomplete Dominance

Answers

Answer:

this maby

Explanation:

Which of the following statements best shows why it would be winter in the
southern hemisphere and summer in the northern hemisphere?

Answers

Answer:

If it says something about the Earths axis then that would be the answer

Explanation:

The Earth is on a bit of a tilt.

2. What term is used to define when a cell has reached a balanced state?

Answers

Answer:

equillibrium

Explanation:

Riparian zones can reduce the impact of water pollution. Please select the best answer from the choices provided True or False

Answers

Answer:

It true did the test just now

Explanation:

True. Riparian zones can reduce the impact of water pollution.

What are Riparian Zones?

Riparian zones are the areas of land located along the banks of rivers and streams. They are important ecosystems that provide a variety of ecological, hydrological, and biological services, such as water filtration, flood control, habitat for wildlife, and recreation opportunities.

Riparian zones are also crucial for maintaining the overall health of river systems and for mitigating the impacts of human activities such as agriculture, urbanization, and resource extraction.

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#SPJ6

How are the particles in this picture below organized?

from high particle motion to low particle motion
from low particle motion to high particle motion
the particle motion is the same in all stages

Answers

Answer:

Solid, liquid, Gas

Explanation:

Yeet

Answer:

At this level, students are expected to 'explain the behaviour and properties of materials in terms of their constituent particles and the forces holding them together’ (VELS standards Level 6). However, the fact that students may be able to draw the usual static arrangements of particles in solids, liquids and gases does not mean that they hold a fully particulate view of matter. Research evidence suggests that many students at this age and older still hold a number of alternative conceptions about particles which prove difficult to extinguish. They often lack an appreciation of the very small size of particles, attribute macroscopic properties to microscopic particles, have difficulty appreciating the motion of particles in all states of matter and have problems understanding forces between particles.

Explanation:

sorry for it being long have a good day

please help me I’ll give you brainliest Please tell me please help me please help please help please help please help me please help me

Answers

Answer:

1: Combustion 2:Atoms 3: Fission 4: Nucleus 5: energy 6: Photosynthesis 7: Solar Energy

Explanation:

How do diatoms and algae obtain their food?

Answers

Answer:

Explanation:

I don't know how diatoms obtain their food, but I do know how algae obtains it. Algae is a plant, that green stuff you find growing on rocks in creeks and lake shores. Plants turn sunlight, water, and carbon dioxide into sugars, which it uses for food. Most plants also obtain nutrients from soil and water using their roots, but algae doesn't have roots so it only gets food through the process I explained above, photosynthesis. I hope this has been helpful.

Answer:

Diatoms

Explanation:

They obtain food by absorbing nutrients from ocean water. Unlike many other types of phytoplankton and marine organisms, diatoms don’t have body parts that allow them to swim. They obtain food by absorbing nutrients from ocean water, which is a very competitive process. Diatoms are relatively large and at a disadvantage for food absorption due to their bodies’ reduced surface areas.

Which of the following best describes how a channel protein moves materials across the membrane? A)They provide a carrier for specific molecules to bind to and cross the membrane via endocytosis. B)They provide a passage for specific molecules to cross the membrane via passive transport. C) They provide a tunnel for solutes to cross the membrane via active transport. D) They provide energy needed for solutes to cross the membrane via facilitated diffusion.

Answers

Answer:

I would like to say A.......

A. From what I remember.

What reaction occurs in the stroma of the chloroplast?

Group of answer choices

Krebs Cycle

Light Independent Reactions

Light Dependent Reactions

Glycolysis

Answers

So it is light depending recording because of it

Answer:

Light Independent Reactions

Explanation:

The stroma is the fluid-filled space of chloroplasts the thylakoids. It contains all the enzymes required for light-independent reactions of photosynthesis and is, therefore, the site of the Calvin cycle.

The Krebs cycle and glycolysis are stages of cellular respiration and occur in the mitochondria.

The light-dependent reactions occur in the thylakoids

2. Which of these is not an ecological pyramid?
A. Pyramid of Energy
B. Pyramid of Biomass
C. Pyramid of Numbers
D. Pyramid of Species

Answers

Answer:

A. pyramid of energy

Explanation:

because yea

C or A becauseeeeeeeee yea

can someone please help me with this question

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Answer:

C

Explanation:

In short why is homeostasis so important for survival

Answers

Answer:

Homeostasis is the self regulating mechanism.

for example, It keeps the stable environment within the body. i.e., eventhough our surrounding environment is very chill our body temperature won't change.

How many poles does Jupiter’s magnetosphere have? a. 2 c. 8 b. 4 d. 9

Answers

Answer:

A. 2

Explanation:

I was wrong the first time, I wasn't thinking of jupiter for some reason. sorry!

Answer:

A. 2

Explanation:

Jupiter's magnetic field is quite different from that of all other known planets — it essentially has two magnetic south poles instead of just one, a new Nature study finds. Scientists analyzed Jupiter with NASA's Juno spacecraft, which reached the planet sometime in 2016.

Identify the macromolecule in the figure that store genetic information in molecules DNA, and RNA?

Answers

Answer:

The correct answer is - option 2. (chemical structure of the nucleotide)

Explanation:

Nucleic acid, DNA and RNA stores genetic information which helps in produces various proteins and for the next generation of the cells. Nucleic acids are made up of monomers of nucleotides joined together to form the nucleic acids. Each nucleotide has sugar, a nitrogenous base, and phosphate in the structure that joined to form a helix structure.

Thus, the correct answer is - option 2.

Answer:

Explanation:

2

What is the y-axis of this chart

Answers

Answer:

In this case, the temperature is supposed to go in the y-axis whereas the rates are on the x-axis.

Root cells of plants take in some minerals from the surrounding soil by spending energy. After the plant obtains enough minerals to maintain health, the plant will continue to absorb minerals from the soil. Which reason best explains why root cells need to spend energy in order to transport some minerals into cells?

Answers

The question is incomplete; the complete question is;

Root cells of plants take in some minerals from the surrounding soil by spending energy. After the plant obtains enough minerals to maintain health, the plant will continue to absorb minerals from the soil. Which reason best explains why root cells need to spend energy in order to transport some minerals into cells?

Root cells are unable to use sunlight energy for mineral uptake.

Mineral concentration is higher in root cells than in the surrounding soil

Cell membrane pores in roots are too small for passive uptake of minerals

Cell membranes in roots lack proteins for the passage of minerals.

Answer:

Mineral concentration is higher in root cells than in the surrounding soil

Explanation:

Mineral uptake by plant roots occurs by active transport of ions into the cells of root hairs, this process requires energy.

The concentration of minerals in the soil is quite low. The root hair cells of plants possess carrier proteins that carry mineral ions and move them into the cell against existing concentration gradient. This process requires energy and is known as active transport.

Which is a bad practice when dealing with hot or flammable items?
A. Keeping loose papers near open flames
B. Tying back loose hair
C. Wearing insulated gloves to handle hot objects
D. Knowing the locations of emergency exits

Answers

Answer:

A, keeping loose papers near open flames

Answer:

A

Explanation:

Which of the following characteristics is common to both bacteria and viruses?

Group of answer choices

can be killed using antibiotics

contains genetic material

has a cell wall

has a cell membrane

Answers

can be killed using antibiotics

Explanation:

Because kill them

Round to the nearest tenth. 7.514

Answers

Answer:7.5

Explanation: The 5 is in the tenths place and the number in the hundredths place is less than 5 which means you drop it and you’re left with 7.5

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