possible question and essays for gr 12 Life Scences​

Answers

Answer 1

Answer:

Explanation:

Possible Essays for Life Science:

1. "Explain four management strategies to improve the quality of  drinking water. Uncle Two sources of water pollution and Two  effect of water pollution on human health. "

2. "Eutrophication is one of most important water quality problem  South Africa. Describe Eutrophication, what causes it and how it  affects water quality."

3. "Describe the significance of DNA replication and meiosis and how the foetus is  protected and nourished in the uterus."

4. "Describe how meiosis contribute to genetic variation and how

abnormal meiosis leaf to down syndrome and polyploidy. Also

describe advantages of polyploidy in agriculture. "


Related Questions

PLEASE HELP!!!! Free earlobes are dominant over attached ear lobes in humans. Josiah's earlobes are free. Which of the following statements is true?

His genotype is ee.
His genotype could be Ee or EE.
His genotype must be EE.
There is no way to determine his genotype.

Answers

Answer:

EE and I'm just gonna say random thing cause I need 20 characters yes

Explanation:

because yes

Answer: could be EE or Ee

Explanation:

if something is domin over another, the capital comes first no matter what.

Question 1
Which clade of organisms is characterized as containing many extremophilic microbes?
А
archaea
B
eukaryotes
С
fungi
D
plants

Answers

Answer:

The answer is A.) Archaea.

The clade of organisms characterized as containing many extremophilic microbes is archea. The correct option is A.

What are archaea?

A class of microbes known as archaea is related to yet evolutionary separate from bacteria. Numerous archaea have been discovered to survive in harsh conditions, such as high pressures, salt concentrations, or temperatures.

Extremophiles are the name given to these kinds of creatures. Single-celled microbes called archaea have a similar structure to bacteria. They make up the third domain of life and are unique from bacteria and eukaryotes in terms of evolution. Archaea are obligate anaerobes that exist in low-oxygen settings (e.g., water, soil).

Therefore, the correct option is A, archaea regarding the extremophile microbes.

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Explain the difference between the calorie (lowercase C) and the Calorie (Capital C)?

Answers

calorie (with a lowercase “c”) is the energy needed to increase the temperature of water by one degree Celsius.

Calorie (uppercase “c”) is the equivalent to a kilocalorie (or 1000 calories)

A scientist is using a species of green algae to study the electron transport chain in photosynthesis. He uses a laser to inactivate all of chlorophyll A in the algae but leaves chlorophyll B intact (case 1). In a separate experiment, the scientist applies a chemical to the algae that inhibit PS I but do not affect PS II (case 2).
Which of the following results is expected?
A)in case 1, only PS I completely loses function; in case 2, no proton gradient is produced.
B)In case 1, only PS I completely loses function; in case 2, a proton gradient is still produced.
C)In case 1, both PS I and PS II completely lose function; in case 2, no proton gradient is produced.
D)In case 1, both PS I and PS II completely lose function; in case 2, a proton gradient is still produced.

Answers

Answer:

D) In case 1, both PS I and PS II completely lose function; in case 2, a proton gradient is still produced.

Explanation:

The light dependent reaction of photosynthesis, which produces the ATP and NADPH needed in the light independent stage of the process, includes complexes of proteins and pigments called PHOTOSYSTEMS. These photosystems (I and II) are key to the functionality of the light dependent reactions in the thylakoid.

The major pigment present in both photosystems is CHLOROPHYLL A, which absorbs light energy and transfers electrons to the reaction center. Chlorophyll B is only an accessory pigment meaning it can be done without. Hence, if all of the chlorophyll A is inactivated in the algae but leaves chlorophyll B intact as in case 1, both PS I and PS II will lose their function because Chlorophyll A is the major pigment that absorbs light energy in both photosystems.

In case 2, if PS I is inhibited and PS II is unaffected, a PROTON GRADIENT WILL STILL BE PRODUCED because the splitting of water into protons (H+) and electrons (e-) occurs in PSII. Hence, H+ ions can still be pumped into the inner membrane of the thylakoid in order to build a proton gradient even without the occurrence of PS I.

Which fossil fuel is made when plants from swamps are covered, pressed and heated for millions of
years?
A Coal
B Petroleum
C Natural Gas
D Nuclear

Answers

Answer:

petroleum i think , i may b wrong

Answer: A Coal

Explanation:

5. Bagaimanakah penggunaan plastik serai wangi ini dapat menjaga kesihatan?

Answers

Answer:

It has a lot of health benefits of fragrant lemongrass.

Explanation:

The use of this fragrant lemongrass take care of your health by preventing the growth of some bacteria and yeast. It also used to relieve the pain and swelling, reduce fever, improve sugar levels and cholesterol in the blood. It also have antioxidant properties which prevent the chances of diseases in the body. It is also used for the insects as an insect repellent, in short, fragrant lemongrass has a lot of health benefits.

Which of the following is a product of photosynthesis?
protein
fats
nucleic acids
glucose

Answers

Answer:

glucose

Explanation:

Answer:

D glucose is the answer

Which of the following explains why the Multiple-Use Sustained-Yield Act was necessary?
O Increased demand for lumber posed a threat to the nation's forests.
O Public Interest in public forests had declined and needed to be raised.
O Clear-cutting of forests was deemed important to provide for residential areas.
o Forests being opened to Industries led to too great a depletion on many resources.

Answers

Forest being opened to industries led to too great a depletion on many resources

Match the age group with the recommended therapeutic consideration. Place the letter of the age group in the column labeled matching thats is appropriate for the the therapeutic consideration

Answers

Answer:

E

Explanation:

e

Carbon's valence is _____.

Answers

Answer:

Carbon's valence is ±4.

Explanation:

Valency corresponds to the group;

Group 1 has valency +1

Group 2 has valency +2

Group 3 has valency +3

Group 4 has valency ±4

Group 5 has valency -3

Group 6 has valency -2

Group 7 has valency -1

Group 8 has valency 0

The valency refers to how many bonds an atom will make in forming a molecule/compound;

This is also referred to as the combining power of an atom.

A gene carries the _________ for a trait.

Answers

Answer:

A gene carries the information for a trait.

Explanation:

Genes carry the information that determines your traits (say: trates), which are features or characteristics that are passed on to you — or inherited — from your parents. Each cell in the human body contains about 25,000 to 35,000 genes.

A gene carries the information for a trait.

What is gene?

The fundamental structural and operational component of heredity is a gene. DNA is the component of genes. Some genes serve as blueprints for the synthesis of proteins. Many genes do not, however, code for proteins.

A few hundred DNA bases to more than 2 million bases make up a gene in a human. Humans are thought to have between 20,000 and 25,000 genes, according to the Human Genome Project, an international research project that aimed to decipher the human genome's sequence and catalog its genes.

Every gene is present in two copies, one from each parent, in every individual. The majority of a person's genes are the same in all persons, but a tiny fraction (less than 1% of the total) are slightly different.

Therefore, A gene carries the information for a trait.

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volcanic eruptions can affect climate by

Answers

Answer:

The gases and dust particles thrown into the atmosphere during volcanic eruptions have influences on climate. Most of the particles spewed from volcanoes cool the planet by shading incoming solar radiation. The cooling effect can last for months to years depending on the characteristics of the eruption.

Hope this helped, have a good day

Answer:

Volcanoes can impact climate change. During major explosive eruptions huge amounts of volcanic gas, aerosol droplets, and ash are injected into the stratosphere. Injected ash falls rapidly from the stratosphere -- most of it is removed within several days to weeks -- and has little impact on climate change

Explanation:

the widows peak that is seen in some people is an example of what type of trait?
A. single-gene
B. polygenic
B. abnormal

Answers

Answer:

A. single-gene

Explanation:

It is controlled by a single gene that has two alleles. The allele for a widow's peak is dominant over the allele for a hairline with no peak.

what is osmosis biology​

Answers

Answer:

osmosis is the movement of water molecules through a semi permeable membrane from a region of higher concentration to lower concentration

Answer:

osmosis is the movement of water molecules through a semi permeable membrane from a region of higher concentration to lower concentration

Explanation:

just did the question

what is the white of the eye that is protective

Answers

Answer:

The sclera,  besides admitted as the whitten of your eye, in older writing, as the adventitia albuginea oculi, is the unintelligible hempen defensive outer layer of the human eyeball containing primarily collagen and any flexible fibre. Here's a visual reference:

Need this asap!!!
The diagram below shows part of the process of DNA transcription. Which
mRNA base will go in location 3?
A.Uracil
B.Thymine
C.Cytosine
D.Adenine

Answers

Answer:B

Explanation:

Answer: as of april 25th 2023 its D

Explanation:

thats what i got and i was right also im pretty sure that they switch the order

the girl was observing a slide of muscle under microscope identified the muscle of striated on the basis of​

Answers

The cells will be branched , multi nucleate and will contain bands of light and dark color so the answer is C

Answer:

I think ur and is C. and sorry, I got late

name some renewable energy and nonrenewable energy

Answers

Answer:

Renewable resources include timber, wind, and solar while nonrenewable resources include coal and natural gas.

Which of the following is true about cells?
A.
In general, eukaryotic cells do not have a true nucleus or membrane-bound organelles, whereas prokaryotic cells contain both a nucleus and organelles enclosed by membranes.
B.
Neither prokaryotic cells nor eukaryotic cells ever contain both a true nucleus that is well-defined and organelles that are separated from the cytoplasm by membranes.
C.
Both eukaryotic cells and prokaryotic cells always contain both a true nucleus that is well-defined and organelles that are separated from the cytoplasm by membranes.
D.
In general, prokaryotic cells do not have a true nucleus or membrane-bound organelles, whereas eukaryotic cells contain both a nucleus and organelles enclosed by membranes.

Answers

Answer:

d

Explanation:

d 100% literally was just learning about this

The correct answer is D.

What is an ion pump??

Answers

Answer:

Active transporters or ion pumps are transporters that convert energy from various sources—including adenosine triphosphate (ATP), sunlight, and other redox reactions—to potential energy by pumping an ion up its concentration gradient.

Explanation:

How has Earth changed during our current era?
A. Dinosaurs became the dominant life form on Earth.
B. Dense forests developed.
C. The oceans formed from water vapor in the atmosphere.
D. Earth cooled enough to form solid rock.

Answers

ANSWER

THESE ARE SOME DIFFERENT ANSWERS

1. the climate has cooled and has became less humid

2.  Grass started growing across the world.

 

3.  the dense forest has developed

Explanation:

Dense forests started to develop during our current era  is how the earth has shown changes.

What is Forest?

This is defined as the area of land which is dominated by trees and serves as inhabitants for some organisms in the ecosystem.

With time, the earth changed by the forests becoming denser when compared to previous eras.

Read more about Forest here https://brainly.com/question/24518939

The Lost generation was a group of writers,artist, and musicians, intellectuals who

Answers

Answer:

The Lost Generation refers to the generation of writers, artists, musicians, and intellectuals that came of age during the First World War and the “Roaring Twenties.” The unprecedented carnage and destruction of the war stripped this generation of their illusions about democracy, peace, and prosperity, and many ...

Explanation:

Which color of light is reflected by a white t-shirt

Answers

Answer:

All of the colors are being reflected

Explanation:

When cells lose their ability to regulate the cell cycle, they can divide an accelerated rate and from a mass of cells. This mass cells is referred to as?

Answers

Answer:

A tumor

Hope this helps! :)

Which of these factors can help keep a freshwater resource sustainable?
O A. A growing population
O B. A new way of generating freshwater
O c. A new way of polluting water
O D. A growing demand that exceeds renewal rates
SUBT

Answers

Answer:

B.

Explanation:

A only increases the demand for freshwater, which worsens the situation.

C pollutes the water, hence making the freshwater unusable, and making it much, much more worse.

D does not change anything but make it more unsustainable.

Hope this helped!

The factors that can help keep a freshwater resource sustainable are a new way of generating freshwater, which is option B, as the growing population, a new way of polluting water, and a growing demand that exceeds renewal rates are all factors that can put a strain on freshwater resources.

What is a freshwater resource?

Freshwater is a finite resource, and as the population continues to grow, the demand for freshwater increases. Climate change is also affecting freshwater availability with changes in precipitation patterns and increased evaporation rates. Therefore, it is essential to manage freshwater resources in a sustainable way to ensure that they are available for future generations.

Hence, the factors that can help keep a freshwater resource sustainable are a new way of generating freshwater, which is option B,

Learn more about the freshwater resource here.

https://brainly.com/question/29415217

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What is the correct order for the levels of organization?
А
cell
tissues
organs
systems
organisms
B
cell
organs
tissues
organisms
organs
Oc
cell
systems
tissues
organisms
organs
cell
organisms
tissues
organs
systems

Answers

Answer: A

Explanation:

Answer:

i think A is true!

Explanation:

have a nice day:-)

Does Iodine have cations or anions? PLEASE THIS IS REALLY HARD?!

Answers

Answer: Iodine have anions


5. The image above is an example of which boundary?
a. Transform boundary
b. Convergent boundary
Divergent boundary
d. All of the above

Answers

Answer:

Divergent

Explanation:

Answer:

Im smart so the answer is "blah blah blah" saying the correct right answer

Explanation:

Describe the anatomy of the typical long bone

Answers

Answer: HERE'S YOUR ANSWER!!!

Explanation:

Long bones are those that are longer than they are wide. The end of the long bone is the epiphysis and the shaft is the diaphysis. When human finishes growing these parts fuse together. The outside of the flat bone consists of a layer of connective tissue called the periosteum

When two species interact in a way that is beneficial to both species this is what kind of relationship?
A. Parasitic
B. Mutualistic
C. Commensal
D. Symbolic

Answers

Answer:

B

Explanation:

Mutualism is a relationship between two species in which both species benefit. Certain species of bacteria in your intestines form a mutualistic relationship with you.

Answer:

D. Symbolic

Explanation:

hope that helps you out love!! <3

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