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What is genetic drift?
Anonymous Quiz
18%
A. A state in which allele frequencies in a population remain constant.
9%
B. A process where alleles are intentionally altered by external factors.
18%
C. A situation in a population where one allele becomes the only existing variant.
55%
D. A mechanism of evolution driven by random fluctuations in allele frequencies.
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What occurs during fixation in genetic drift?
Anonymous Quiz
23%
A. Genetic equilibrium is reached
23%
B. Allele frequencies become stable
38%
C. Alleles are lost from the population
15%
D. The frequency of one allele reaches 100%
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If the frequency of individuals with the genotype AA is 0.36 in a population that is inHardy-Weinberg equilibrium, what is the frequency of individuals with the genotype Aa?
Anonymous Quiz
22%
A. 0.6
22%
B. 0.24
22%
C. 0.48
33%
D. 0.12
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How does gene flow impact allele frequencies within populations?
Anonymous Quiz
25%
A. It increases the frequency of recessive genetic disorders.
0%
B. It causes the complete disappearance of a species from Earth.
50%
C. It introduces new alleles and alters existing allele frequencies.
25%
D. It makes small group of individuals to establish a new population.
In which part of your body can you easily detect your pulse rate?
Anonymous Quiz
25%
Elbow
33%
Wrist
33%
Chest
8%
Stomach
Oxygenated blood leaves the human heart through the
Anonymous Quiz
38%
Pulmonary vein
25%
Pulmonary artery
13%
Vena cava
25%
Aorta
Meiosis is a type of cell division that takes place in:
Anonymous Quiz
75%
Germ cells
13%
Somatic ce
6%
Nerve cells
6%
Muscle cells
Which of the following animals is found in Nechisar National park ?
Anonymous Quiz
25%
Mountain nyala
33%
Crocodile
8%
Walia ibex
33%
Gelada baboon
Which of the following plants is endemic to Ethiopia ?
Anonymous Quiz
7%
Olive
7%
Blue gum
21%
Maize
64%
Niger seed
At which stage of meiotic cell division does the spindle form &crossing over takes place?
Anonymous Quiz
25%
Telophase I
8%
Metaphase I
50%
Anaphase I
17%
Prophase I
Which of the following chemicals causes the depletion of ozone layer in atmosphere?
Anonymous Quiz
53%
Chlorofluorocarbons
27%
Sulphur dioxide
7%
Carbon monoxide
13%
Carbon dioxide
Plants adapted to desert areas have:
Anonymous Quiz
31%
Curled leaves
23%
Many stomata
31%
Large fleshy leaves
15%
Thin Cuticle
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Chemistry Grade 11 Unit 2 MCQ with explanation
#Target Grade #11 #12
1. Which compound contains a coordinate covalent bond?
A. Oβ
B. NHββΊ
C. COβ
D. NaCl
2. Which molecule is polar?
A. CClβ
B. COβ
C. NHβ
D. CHβ
3. Which compound has both ionic and covalent bonds?
A. MgO
B. CHβOH
C. KNOβ
D. Clβ
4. Which molecule has a linear geometry?
A. HβO
B. COβ
C. NHβ
D. CHβ
5. What is the bond order in OββΊ?
A. 2.5
B. 3.0
C. 1.5
D. 2.0
Answers and Explanations:
1. Answer: B. NHββΊ
Explanation: NHββΊ has a coordinate covalent bond. This bond occurs when one atom provides both electrons for the shared pair, in this case, from NHβ to HβΊ.
2. Answer: C. NHβ
3. Answer: C. KNOβ
Explanation: KNOβ contains ionic bonds between the KβΊ cation and the NOββ» anion. Within the NOββ» anion, covalent bonds exist between the nitrogen and oxygen atoms.
4. Answer: B. COβ
Explanation: COβ is linear due to sp hybridization of the central carbon atom. Each carbon atom is double bonded to the Oxygen atoms.
5. Answer: A. 2.5
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#Target Grade #11 #12
1. Which compound contains a coordinate covalent bond?
A. Oβ
B. NHββΊ
C. COβ
D. NaCl
2. Which molecule is polar?
A. CClβ
B. COβ
C. NHβ
D. CHβ
3. Which compound has both ionic and covalent bonds?
A. MgO
B. CHβOH
C. KNOβ
D. Clβ
4. Which molecule has a linear geometry?
A. HβO
B. COβ
C. NHβ
D. CHβ
5. What is the bond order in OββΊ?
A. 2.5
B. 3.0
C. 1.5
D. 2.0
Answers and Explanations:
Explanation: NHββΊ has a coordinate covalent bond. This bond occurs when one atom provides both electrons for the shared pair, in this case, from NHβ to HβΊ.
2. Answer: C. NHβ
3. Answer: C. KNOβ
Explanation: KNOβ contains ionic bonds between the KβΊ cation and the NOββ» anion. Within the NOββ» anion, covalent bonds exist between the nitrogen and oxygen atoms.
4. Answer: B. COβ
Explanation: COβ is linear due to sp hybridization of the central carbon atom. Each carbon atom is double bonded to the Oxygen atoms.
5. Answer: A. 2.5
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π A Fun Analogy to Remember the Nernst Equation
π The "Electro-CafΓ©" Story ββ‘
Imagine a cozy little cafΓ© called Electro-CafΓ©. It has two tables (like two electrodes), and both serve lemon juice (ions in solution). The same juice is used, but one glass is super concentrated (sour!), and the other is diluted (less sour).
Now, the lemon atoms donβt like imbalance. So, the cafΓ© sets up a wire between the tables. Sourness (concentration difference) causes electrons (guests) to move from the less sour to the more sour glass β trying to make both glasses equally tangy πβοΈ.
The Nernst Equation helps calculate how much βelectrical sournessβ (voltage) this cafΓ© produces based on:
How different the concentrations are (Q)
How many guests (electrons) are exchanged (n)
How hot the cafΓ© is (Temperature T)
π Moral of the story:
Voltage = Standard Voltage - Correction for imbalance
(E = EΒ° β (0.0591/n) log Q)
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π The "Electro-CafΓ©" Story ββ‘
Imagine a cozy little cafΓ© called Electro-CafΓ©. It has two tables (like two electrodes), and both serve lemon juice (ions in solution). The same juice is used, but one glass is super concentrated (sour!), and the other is diluted (less sour).
Now, the lemon atoms donβt like imbalance. So, the cafΓ© sets up a wire between the tables. Sourness (concentration difference) causes electrons (guests) to move from the less sour to the more sour glass β trying to make both glasses equally tangy πβοΈ.
The Nernst Equation helps calculate how much βelectrical sournessβ (voltage) this cafΓ© produces based on:
How different the concentrations are (Q)
How many guests (electrons) are exchanged (n)
How hot the cafΓ© is (Temperature T)
π Moral of the story:
Voltage = Standard Voltage - Correction for imbalance
(E = EΒ° β (0.0591/n) log Q)
join https://t.me/quiz_storm for more detailsπ€
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