1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Minchanka [31]
3 years ago
8

Describe a control for the above experiment. The factor, the presence of starch (if the process of photosynthesis has taken plac

e or not) needs to be left out. How would you do this?​
Biology
1 answer:
Yuliya22 [10]3 years ago
4 0
Hi their here is the Answer

During photosynthesis a plant absorbs light energy using the pigment chlorophyll. This allows it to convert carbon dioxide and water into glucose. This glucose is:

transported to the growing parts of the plant for use in respiration
transformed into cellulose, proteins and oils
turned into starch for storage
Therefore, to test if a plant has been photosynthesising, you can test the leaf to see if starch is present.

Iodine solution is used to test leaves for the presence of starch. You need to:

heat a plant leaf in boiling water for 30 seconds (this kills the leaf, stopping any chemical reactions)
add the leaf to boiling ethanol in a water bath for a few minutes (the boiling ethanol dissolves the chlorophyll and removes the green colour from the leaf - it turns white so it is easy to see the change in colour)

wash with water to rehydrate and soften the leaf and spread onto a white tile
add iodine solution from a dropping pipette
After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.

Hope this helps :)
You might be interested in
William compared two soil samples to check soil’s ability to support the growth of plants. He had read that plants grow best in
horsena [70]

Answer:

A

Explanation:

Soils rich in humus improve plant growth. Earthworms breakdown organic matter to form humus. From the data, it can be seen that plant growth is high in soil that has humus.

3 0
3 years ago
Read 2 more answers
Two important contrasts between seagulls and wild geese are
azamat
<span>On the other hand, seagulls are scavengers, while wild geese aren’t. Seagulls, for example, are often found around garbage dumps. Geese, however, feed on things like seeds and insects. Hope this helps...

</span>
3 0
4 years ago
A peron with cystic fibrosis releases few enzymes into their small intestine. Explain what problems this cause?
kow [346]
This would make it hard for a person to digest their food because enzymes are used to help speed up the process of its specific job
6 0
3 years ago
A mother arrives at the clinic with her 3-year-old child. the mother tells the nurse that the child has had a fever and a cough
vekshin1

<span>Based on the diagnosis, the nurse anticipates that there will be a component of the treatment plan is supportive. More severely ill children may be hospitalized and given oxygen, chest physiotherapy, and IV fluids. Antibiotics are not given. Bacterial pneumonia, however, is treated with antibiotic therapy.</span>


6 0
3 years ago
Why would rapid change in climate potentially lead to ecological problems?
nadya68 [22]

The rapid change in the climate would potentially lead to ecological problems because evolution is unlikely to occur quickly enough to keep pace with biome changes.

<h3>What do you mean by Evolution?</h3>

Evolution may be defined as the process of growth and development or the theory that organisms have evolved and developed from past organisms.

Biome changes occur due to the fact of evolution. Both evolution and biome changes synergistically move forward to support organisms' life in a much better way.

Therefore, the rapid change in the climate would potentially lead to ecological problems because evolution is unlikely to occur quickly enough to keep pace with biome changes.

To learn more about Evolution, refer to the link:

brainly.com/question/1144962

#SPJ1

8 0
2 years ago
Other questions:
  • The least desirable method of restraint for a cat is
    10·2 answers
  • How do species (like us) survive
    14·1 answer
  • With cladogenesis __________. species A might branch into two or more species species A and species B cannot coexist species A b
    13·1 answer
  • Which of the following statements regarding fungi is false? The first antibiotic discovered came from a fungus. Fungi are import
    15·1 answer
  • Based on the data in the table, what is the difference between the mean numbers of turkey vultures and great blue herons observe
    8·2 answers
  • Match the time period with the correct layer of fossils (mya = millions of years ago). ITEM BANK: Move to Bottom 175 mya250 mya4
    15·1 answer
  • SS and In catde , the allele for short horns (S) is dominant over the allele for long horns (s)TWO short horn cows are bred and
    6·1 answer
  • Forces, Motion, &amp; Speed (6.8B,C &amp; D): Question 8
    11·1 answer
  • 7)When a body cell divides through the process of mitosis, the chromosomes in the daughter cells *
    15·1 answer
  • What is the process of moving food through the alimentary canal called?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!