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How does gene flow impact allele frequencies within populations?
Anonymous Quiz
18%
A. It increases the frequency of recessive genetic disorders.
5%
B. It causes the complete disappearance of a species from Earth.
55%
C. It introduces new alleles and alters existing allele frequencies.
23%
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?
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23%
Elbow
31%
Wrist
38%
Chest
8%
Stomach
Oxygenated blood leaves the human heart through the
Anonymous Quiz
41%
Pulmonary vein
24%
Pulmonary artery
12%
Vena cava
24%
Aorta
Meiosis is a type of cell division that takes place in:
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76%
Germ cells
12%
Somatic ce
6%
Nerve cells
6%
Muscle cells
Which of the following animals is found in Nechisar National park ?
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23%
Mountain nyala
31%
Crocodile
8%
Walia ibex
38%
Gelada baboon
Which of the following plants is endemic to Ethiopia ?
Anonymous Quiz
7%
Olive
7%
Blue gum
27%
Maize
60%
Niger seed
At which stage of meiotic cell division does the spindle form &crossing over takes place?
Anonymous Quiz
23%
Telophase I
15%
Metaphase I
46%
Anaphase I
15%
Prophase I
Which of the following chemicals causes the depletion of ozone layer in atmosphere?
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50%
Chlorofluorocarbons
31%
Sulphur dioxide
6%
Carbon monoxide
13%
Carbon dioxide
Plants adapted to desert areas have:
Anonymous Quiz
36%
Curled leaves
21%
Many stomata
29%
Large fleshy leaves
14%
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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Which of the following structure is not found in bacteria?
Anonymous Quiz
30%
Mitochondria
35%
Cell wall
4%
Ribosome
30%
Nucleiod
What is the main component of the bacterial cell wall?
Anonymous Quiz
9%
Cellulose
65%
Peptidoglycan
26%
Chitin
0%
Lipids