Biology (علم حیاتیات) For Class IX (Science) - Solved Model Paper 2023- By BSEK

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Class IX (Science)
Biology Solved Model paper 2023

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Solved Model paper
SECTION "B" (40%) 
SHORT ANSWERS QUESTIONS (24 Marks)

Q.2: Name and define any three branches of biology?
(Note: do any three as mentioned in question)
Ans: BRANCHES OF BIOLOGY:
Modern biology deals with the structure, function and many other descriptions of living things. Advance research during the 20th Century has led to the division of biology into specialized branches. Some important branches are defined below:

1. Morphology (Gr. morph; form, logos; discourse):
   The study of external form and structure of organisms.
   
   
2.  Anatomy (Gr. ana; part/up, tome; cutting):
   The study of internal parts of body of living organisms by cutting them open.
   
   
3. Cell biology (L. cells, compartment, Gk. Bios= life; logos; discourse):
   The study of cell and its organelle.
   
   
4. Histology (Gr. histos: tissue; logos, discourse):
   The study of structure of tissues of plant and animals.
   
   
5. Physiology (Gr. physis; nature, logos, discourse):
   The study about functions of living organisms.
   
   
6. Taxonomy (Gr. taxis, arrangement, nomos: name):
   The study of the rules, principles, grouping and naming the living organisms.
   
   
7. Genetics (Gr. genesis; descent, origin):
   The study of heredity, that is transferring of characters from parents to offspring.
   
   
8. Developmental biology (Gr. embryon; embryo, logos, discourse):
   The study of formation and development of embryo.
   
   
9. Environmental biology:
   The study of relationship between living organisms and non-living factors of environment and their effects on each other.
   
   
10. Paleontology (Gr. palaios; ancient, ontos; being, logos: discourse):
    The study of remote past organic life, with the help of fossils.
    
    
11. Biotechnology:
    The study about techniques for manipulation of gene to bring the changes in structure and location of genes to achieve desirable characters is called biotechnology.
    
    
12. Socio-biology (L. sociare; to associate,):
    The study of social behavior of living organisms. i.e interaction between themselves.
    
    
13. Parasitology (Gr. para; up):
    The study of parasites.
    
    
14. Pharmacology (Gr. pharmakon, drug;):
    The study about action of drugs.
    
    
15. Molecular biology:
    The study of organic molecules which constitute cell and its organelles.

Q.3: Name the main organ found in:
i) Reproductive System
ii)Respiratory System
iii) Excretory System
Ans: Different Organs With Relative Organ Systems:
i) Reproductive system:

• Male: Testes, vasa efferentia, urinogenital dust, Fat bodies
• Female: Ovaries, Oviduct, Ovisac, Fat bodies

ii) Respiratory system:

• Buccal: Lining of mouth
• Cutaneos: Moist Skin
• Pulmonary: Lungs,nostrils, laryngo-tracheal chamber, bronchi, Alveoli

iii) Excretory system:
Kidneys, Ureter, Urinary Bladder, Cloacal aperture

Organs Found in other Organ Systems:

Organ System	Organs
Digestive system	Alimentary Canal: Mouth, buccal cavity, Pharynx, Esophagus, stomach, small intestine (Duodenum, Ileum) , large intestine, cloaca, cloacal aperture. Glands: liver with gall bladder and pancreas.
Circulatory system	Heart, left and right atria, left and right ventricles, truncus arteriosus, Aortae, Vena cavae
Nervous system	Brain, Spinal Cord, Nerves