Two test tubes are filled with a solution of bromthymol blue. A student exhales through a straw into each tube, and the bromthymol 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?Question 11 options:

Oxygen was produced by photosynthesis.

Oxygen was removed by respiration.

Carbon dioxide was removed by photosynthesis.

Carbon dioxide was produced by respiration.

Answers

Answer 1

Answer:

Explanation:

The plant is utilizing CO2 in photosynthesis

Photosynthesis produces glucose and O2 from inorganic CO2, light energy and water.

6CO2 + 6H20 + (energy) → C6H12O6 + 6O2

Bromothymol blue, an acid indicator, goes from blue to yellow when reacting with acid. The color change in sunlight confirmed the use of CO2, dissolved within the solution as carbonic acid- its removal from the solution makes the more basic, and the solution goes from yellow (acidic) to blue (alkaline).

CO2 + H2O ↔ H2CO3

Further Explanation:

Photosynthesis is a chemical pathway that’s integral to producing energy in plants and other primary producers. Energy in the form of molecules of glucose is produced from light, water and carbon dioxide while oxygen is released.

Occuring in several complex steps, photosynthesis is a rate limited reaction, it depends on several factors including carbon dioxide concentration, ambient temperature and light intensity; the energy is retrieved from photons, I.e. particles of light, and water is used as a reducing agent. Water supplies chlorophyll in plant cell with replacement electrons for the ones removed from photosystem II.

Additionally,

water (H2O) split by light during photolysis into H+ and OH- acts as a source of oxygen along with functioning as a reducing agent; it reduces the molecule NADP to NADPH by providing H+ ions and produces molecules of the energy storage molecule ATP through an electron transport chain.
This occurs in the thykaloids, where pigment molecules like chlorophyll reside.
Later, in dark reactions, NADP and NADPH are used in the Calvin cycle where monosaccharides or sugars like glucose are produced after the modification of several molecules. These store energy in their bonds, which can be released in respiration in the mitochondria.

In all eukaryotic cells mitochondria are small cellular organelles bound by membranes, these make most of the chemical energy required for powering the biochemical reactions within the cell. This chemical energy is stored within the molecule ATP which is produced. Respiration in the mitochondria utilizes oxygen for the production of ATP in the Krebs’s cycle via the oxidization of pyruvate( through the process of glycoysis). The electron transport chain, in which oxygen functions as the terminal electron acceptor occurs in both plants and animals.

Learn more about photosynthesis at brainly.com/question/4216541

Learn more about cellular respiration at brainly.com/question/11203046

Learn more about cellular life at brainly.com/question/11259903

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Both the tundra and the desert experience/contain:I. permafrost
II. low precipitation
III. poorly developed soils
IV. animals with extreme adaptations
V. hot days and cold night

A) II only
B) I and II only
C) II, III, and IV only
D) III, IV, and V only

Answers

Answer:

C) II, III, and IV only

II. low precipitation

III. poorly developed soils

IV. animals with extreme adaptations

Explanation:

This is something that generally comes from environmental knowledge.

I. Permafrost. This is commonly found in Tundra's, and is arguably the definition OF a tundra. Tundra's have land with underlying permafrost, which prevents plants that rely on large roots from breaching the land. Deserts don't have THIS problem, they just have sand and overly dried rock-soil.

II. Low precipitation. This is true of both deserts and tundras. If you've ever seen a desert-set- movie, you'd know that the prominent issue of deserts is that they never seem to have water. While Hollywood isn't to be considered accurate, it DOES have some truth here. Deserts are infamous for their extremely low amounts of precipitation (rain). Tundras are nearly identical, though due to other reasons.

III. Poorly developed soils. Yes, Tundras and Deserts both have terrible, terrible soil, for opposite reasons. Tundras are known for extremely low temperatures and little precipitation. Deserts are known for extremely hot temperatures and little precipitation. With Tundras, permafrost lays beneath all the land, preventing any serious plants from growing (outside of resilient grasses, weeds, and shrubs). Deserts have the opposite issue... they average 102 degrees during the day and 24 degrees at night. Excluding the typical presence of sand, this makes for VERY rough soil, as it's baked throughout the day and hardened at night.

IV. Animals with extreme adaptions. Yes. In Tundra's, you'll find a majority of animals that have found ways to adapt to the extremely low temperatures... namely foxes, hares, reindeer, wolves, birds, and some smaller mammals. In deserts, you'll find animals who've adapted to living and thriving in hot temperatures and tolerating the night temps. . .namely reptiles, foxes, scorpions, and armadillos, along with some birds.

V. Hot days and Cold nights. As mentioned before, Deserts average 102F during the day and 24F at night. On the CONTRARY, tundras average -30F to 20F. Obviously, this answer choice is only applicable to deserts.

Hope this helps!

~Troy

What is the function of spinal fluid?

Answers

The spinal fluid is actually called cerebrospinal fluid(CSF). It's job is to pretty much protect the brain and spine. It also soaks them in nutrients and gets rid of waste products from the spine and brain.

Why is it important for dna to be duplicated before mitosis

Answers

If it didn't, one cell would end up with the original DNA, the other wouldn't be a functional cell, because it would lack DNA. If the DNA was split between the two cells, neither cell would have a complete copy.
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It is important because that's how it will split into two new daughter cells.

Every year, Earth’s lithospheric plates move between 2 cm and 5 cm. What causes these plates to move?

Answers

Scientist think convection currents are what cause earths plates to move. a convetion current is caused by the diffrence in the temperature, Mantle material close to the earths core is very hot. Mantle material near the lithosphere is cooler.

What kind of boundary is shown in the image below?Convergent
Divergent
Collisional
Transform