<u>Answer:</u>
Cyanobacteria start producing pure oxygen around 200 million years ago.
<u>Explanation:</u>
Many scientists believed that Earth did not have any oxygen. Cyanobacteria or the blue green algae are the microbes which produced oxygen for the first time with the help of photosynthesis. This was around 4.5 billion years ago: after Hadean eon.
They were very simple, but they produced oxygen in the early earth’s atmosphere. So, they brought evolution on earth. This “blue-green algae” exists in salt water, rocks and soils and play a major role in maintaining the ecosystem.
The options of the given question are:
method for DNA delivery
gene construct
efficient selection strategy
tissue culture system
Answer: Tissue culture system.
Explanation:
The role of tissue culture system is not much in case of the transgenic plant. The method of DNA delivery, efficient selection strategy and gene construct are involved in the plant transformation.
But plant tissue culture is not directly involved in the plant transformation. The plant tissue culture is the collection of the techniques which is used to maintain the growth of the plant cells and so it does not plays any important role in plant transformation.
The plant transformation is the introduction of the desired characters into the plant and then the growth of transformed plant takes place in the culture medium. This has no role in the plant transformation or has less role.
Answer:
Diffusion
Explanation:
Oxygen molecules can travel through the phospholipid bilayer using diffusion. Diffusion is when molecules travel from a higher concentration to a lower concentration.
The list of household electrical appliances categorized according to their power consumption and what fuse they will use are:
<u>3A Fuse </u>
- A table lamp,
- Computer
- Blender,
- Refrigerator
- Deep freezer etc.
For every appliance that is rated between 700 and 3000 watts, it's plug should have a 13-amp fuse installed onto it.
<h3>
What is a fuse value?</h3>
A fuse rating is the amount of current required to blow (break) the fuse. When a fuse blows, it disconnects power from an electrical system.
The fuse rating is generally printed on the fuse itself. The fuse rating is often expressed in 'amps,' which is the standard measurement for electrical current.
<h3>Why are electrical fuses important?</h3>
If an appliance malfunction results in an excessive current flow, the fuse shuts off the circuit.
If something goes wrong, this safeguards both the wiring and the appliance. A wire that melts easily is within the fuse.
Learn more about fuse values at;
brainly.com/question/23959921
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Full Question:
As we know that the three most common household fuse values are 3A, 5A, and 13A.
Make a list of your household electrical appliances. Divide them into three groups according to their power consumption to decide what fuse should be fitted in the plug for each of them.
Answer:
Plantae is the kingdom that carries out photosynthesis
