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part 3 ይቀጥላል

in chemistry grade 9-10
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✅Multiple Choice Questions on about Fungi✍️✍️✍️✍️✍️✍️

1. Fungi can be stained by

a) Saffranine
b)Cotton blue
c)  Glycerine
d)  Lactophenol

2. Fungi usually store the reserve food material in the form of
a) Starch
b) Lipid
c) Glycogen
d) protein

3. Fungi can be distinguished from algae in fact that

a) Cell wall is cellulosoic cell wall and chlorophyll is absent
b) Nucleus is present
c)  Mitochondria are absent
d)  Cell wall is chitinous and chlorophyll is absent

4.  Ergot is obtained from
a) Rhizopus
b) Claviceps
c) Albugo
d) Phytomonas

5. One of the following is a predatory fungus
a) Arthrobotrys
b) Puccinia
c) Fusarium
d) Alternaria

6.  Fungi producing usually eight spores in a sac like structure belong to
a) Phycomycetes
b) Ascomycetes
c) Basidiomycetes
d)  Deuteromycetes
MCQ on Fungi - mushroom

7.  One of the following is a heteroceous fungus?
a) Albugo
b) Phytophora
c) Puccinia
d) Ustilago
heteroceous fungus

8. In some parasitic fungi a globular or hook like structure is formed at the point of contact with the host. This is known as

a) Haustoria
b) Appresorium
c) Hold fast
d) Hook

9. Fungi which grow on dung are termed as
a) Coprophilous
b)  Terricolous
c) Sacxicolous
d) Saxiphilous

10.  The fruiting body of Aspergillus is called  fruiting body of Aspergillus

a) Apothecium
b)Perithecium
c) Cleistothecium
d) Hypanthodium

11. All fungi are
a) autrophs
b) Saprophytes
c) Parasites
d) Heterotrophs

12. One of the common fungal diseases of man is
a) Cholera
b) Plague
c) Ringworm
d) Typhoid
Fungi gif

13.  Aflatoxin is produced by
a) Bacteria
b) Virus
c) Fungi
d) Nematode

14. Yeast is unlike bacteria in being

a) Unicellular
b) Multicellular
c) Prokaryotic
d) Eukaryotic

15. “Perfect stage” of a fungus means
a) When the fungus is perfectly healthy
b) When it reproduces asexually
c) When it forms perfect sexual spores
d) None of these


✍️✍️Answers:✍️✍️
1-b   2-c    3-d     4-b    5-a
6-b   7-c    8-b   9-a    10-c
11-d   12-c 13-c  14-d  15-c

Understanding hybridization can sometimes seem complex, but there are easy ways to identify hybridization states like sp, sp2, and sp3 in organic compounds. Here are some simplified rules and tricks to identify them quickly:

### Key Points for Identifying Hybridization:

1. Count the Regions of Electron Density:
   - Regions of electron density include bond pairs and lone pairs around an atom.
   - Each bond (single, double, or triple) and each lone pair count as one region of electron density.
   - For sp hybridized atoms, the sum of regions of electron density is 2.
   - For sp2 hybridized atoms, the sum is 3.
   - For sp3 hybridized atoms, the sum is 4.

2. Look at the Molecular Geometry:
   - Linear: Indicates sp hybridization.
   - Trigonal Planar: Suggests sp2 hybridization.
   - Tetrahedral: Signals sp3 hybridization.

3. Check the Number of Sigma Bonds:
   - In sp hybridization, the atom forms 2 sigma bonds.
   - In sp2 hybridization, the atom forms 3 sigma bonds.
   - In sp3 hybridization, the atom forms 4 sigma bonds.

4. Identify Presence of Pi Bonds:
   - Remember that pi bonds are formed by unhybridized p orbitals.
   - An sp hybridized atom has 0 pi bonds (triple bond).
   - An sp2 hybridized atom has 1 pi bond (double bond).
   - An sp3 hybridized atom has 0 pi bonds (single bonds only).

### Quick Examples:

- CO2 (Carbon Dioxide):
  - Each oxygen has 2 regions of electron density, making it sp hybridized.
 
- CH4 (Methane):
  - Carbon has 4 regions of electron density, indicating sp3 hybridization.

- H2O (Water):
  - Oxygen has 4 regions of electron density (2 bonds + 2 lone pairs), so it is sp3 hybridized.

These simple rules can help you quickly determine the hybridization state of atoms in molecules. Practice with more examples to enhance your skills and boost your confidence in identifying hybridization states in organic compounds!

በቀላሉ chemistry

### General Chemistry Tricks:

1. Periodic Table Trends:
   - Left and Down: Atomic size increases.
   - Right and Up: Ionization energy increases.

2. Ionic vs. Covalent:
   - If it starts with a metal, it tends to be ionic. Non-metals usually form covalent compounds.

3. Acids and Bases:
   - Acids Donate: Acids donate H⁺ ions.
   - Bases Accept: Bases accept H⁺ ions.

4. Oxidation Numbers:
   - In a compound, sum of oxidation numbers is 0. In polyatomic ions, the sum is the ion's charge.

5. Balancing Equations:
   - Balance by trial and error while keeping polyatomic ions together and balancing least common atoms first.

### Organic Chemistry Tricks:

6. Hybridization Quick Check:
   - Count sigma bonds + lone pairs to determine hybridization (sp, sp2, sp3).

7. Electrophiles vs. Nucleophiles:
   - Electrophiles are electron deficient and love electrons.
   - Nucleophiles are electron rich and seek positive charges.

8. Organic Functional Groups:
   - Draw little diagrams to help remember structures and reactions of common functional groups.

### Chemical Reactions Tricks:

9. Redox Reactions:
   - OIL RIG: Oxidation Is Loss, Reduction Is Gain.

10. Solubility Rules:
    - Always Soluble: Group 1 metals, nitrates, acetates.
    - Mostly Insoluble: Carbonates, phosphates, sulfides, hydroxides.

### Laboratory Tricks:

11. Significant Figures:
    - Count from the first non-zero digit, ignore leading zeros, but include trailing zeros after a decimal point.

12. Titration Tricks:
    - Use a color indicator or a pH value to determine the endpoint of a titration.

### Study and Memorization Tricks:

13. Mnemonics:
    - Use fun phrases like "Leo the lion says GER" to remember LEO (Lose Electrons Oxidation) and GER (Gain Electrons Reduction).

14. Flashcards and Mnemonics:
    - Make flashcards for chemical symbols, ions, and equations. Create rhymes or mnemonics to remember them.

15. Practice, Practice, Practice:
    - The more problems you solve, the better you'll get at understanding and applying concepts.

These tricks can make your chemistry learning experience more engaging and memorable. Feel free to mix and match these tricks according to your learning style and the topics you are studying. Have fun exploring the wonderful world of chemistry! 🧪🔬