Bestudeer die diagram van dagoud-kuikens A en B hieronder - NSC Life Sciences - Question 2 - 2017 - Paper 1
Question 2
Bestudeer die diagram van dagoud-kuikens A en B hieronder. Die diagram is nie volgens skaal geteken nie.
2.1.1 Noem TWEE sigbare kenmerke van kuiken A wat altirisël... show full transcript
Worked Solution & Example Answer:Bestudeer die diagram van dagoud-kuikens A en B hieronder - NSC Life Sciences - Question 2 - 2017 - Paper 1
Step 1
Name TWO visible characteristics of chick A that indicate allometric development.
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Answer
The eyes of the chick are closed, indicating a less developed state.
The chick does not move, which suggests a reliance on environmental safety and protection.
Step 2
Explain ONE possible advantage of viviparity compared to oviparity.
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Answer
One possible advantage of viviparity is that the developing embryo receives direct nourishment from the mother, which can lead to higher survival rates in the young since they are better protected.
Step 3
Explain why you suspect that the yolk/egg quality of the egg from chick B was greater than that from chick A.
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Chick B likely had better yolk quality due to the nutrients being more concentrated and fortified, which supports the larger and healthier growth seen in chicks.
Step 4
Which eye disease/disorder is the least common in the population?
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Byseindheid (Astigmatism) is the least common ocular disorder in the population.
Step 5
What percentage of the population suffers from failure? Show ALL your calculations.
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From the table, the total number of people with visual impairment is 142 million, with 14.1 million suffering from visiness. Therefore:
Draw a bar graph to represent the number of people in the population who suffer from cataracts, astigmatism, and visiness.
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The graph should have three bars, each representing respectively:
Cataracts: 24.4 million
Astigmatism: 14.1 million
Visiness: 34.1 million.
Step 7
What eye disease/disorder in the table:
(a) Cataracts
(b) Astigmatism
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(a) The condition with the most significant prevalence in the population is Cataracts with 24.4 million.
(b) Astigmatism is the second most prevalent disorder with 14.1 million.
Step 8
Write ONE phrase from the excerpt indicating climate change affects the following:
(a) Food security
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Climate change affects food security by altering the availability of crops due to changing weather patterns and increasing temperatures.
Step 9
Water availability
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Water availability is affected by climate change as it leads to more severe droughts and altered rainfall patterns.
Step 10
From the graph, give the CO₂ level in the atmosphere in 2013.
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The CO₂ level in the atmosphere in 2013 was approximately 395 parts per million.
Step 11
Describe how the warming of forests by humans contributes to global warming.
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The warming of forests increases the rate of photosynthesis and carbon release, thereby leading to elevated levels of CO₂ in the atmosphere, which contributes to climate change.
Step 12
Describe THREE ways in which invasive plants can disrupt the basic ecosystem.
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Invasive species outcompete native species for resources.
They disrupt food webs by altering habitat structures.
They can lead to a decline in native biodiversity.
Step 13
Identify part A.
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Answer
Part A represents the centromere.
Step 14
Identify the phase represented in the diagram.
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Answer
The diagram shows the Metaphase II stage during meiosis.
Step 15
Explain how the phase identified in 2.5.2 contributes to variation in the gametes.
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During Metaphase II, chromosomes align randomly at the equatorial plane, leading to independent assortment and increased genetic diversity in the gametes.
Step 16
Was present in the original cell during interphase?
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Yes, the original cell contained full sets of chromatids during the interphase stage.
Step 17
Will present in every gamete formulated at the end of meiosis?
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No, each gamete will only receive one chromatid from each pair, leading to varied genetic information.
Step 18
What process resulted in the two chromatids in each chromosome differing from each other?
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The crossing over process during prophase I results in genetic variation by exchanging segments between homologous chromosomes.
