Class 9 Biology Solved Paper 2018


Class 9 Biology Solved Paper 2018 Federal Board is presented to you in this post. You can see the more FBISE solved past papers of class 9 on our website.


Class 9 Biology Solved Paper 2018

Section A

Q1. MCQs


Class 9 Biology Solved Paper 2018


Section B


Q2. Attempt any ELEVEN parts. The answer to each part should not exceed 3-4 lines.

(i)  Define the following:
a.  Species
b.  Population
c.  Community

Ans. (a) Species: A species is a group of organisms that can interbreed freely among them and produce fertile offspring but are reproductively isolated from all other such groups in nature.
(b) Population: A population is defined as a group of organisms of the same species located at the same place, at the same time.
(c) Community: A community is an assemblage of different populations, interacting with one another within the same environment.


(ii)  Write the name of the host organism and disease of the following vectors:
a. Female Anopheles
b. Culex
c. Aedes

Excluded from Syllabus for Annual Exam 2021


(iii) Enlist three observations made by AFA King.

Excluded from Syllabus for Annual Exam 2021


(iv) Five kingdom system of classification of Robert Whittaker was modified by Margulis and Shawartz. What are the bases for this system of classification?

Ans. In 1988, Margulis and Schwartz modified the five-kingdom classification of Whittaker.
The bases of this classification system were:
(i) Genetics
(ii) The levels of cellular organization i.e. prokaryotic, unicellular eukaryotic, and multicellular eukaryotic.
(iii) The principal modes of nutrition i.e. photosynthesis, absorption, and ingestion.


(v) Draw a labeled structure of fluid-mosaic model of cell membrane.

Ans. Fluid-Mosaic Model of Cell Membrane

Class 9 Biology Solved Paper 2018

(vi) What is the meristematic tissue? What are the types of meristematic tissues? Write down their location.

Ans. Meristematic Tissue: These tissues are composed of cells, which have the ability to divide. The cells are thin-walled, have a large nucleus and small or no vacuoles. They do not have intercellular spaces among them.
Types:
(i) Apical meristems are located at the apices (tips) of roots and shoot.
(ii) Lateral meristems are located on the lateral sides of roots and shoot.


(vii) a. What is necrosis?
b. What are the causes of necrosis?
c. When does necrosis occur in a cell?

Excluded from Syllabus for Annual Exam 2021


(viii) Write down the discoveries of following scientists:
a. Oscar Hertwig
b. Walther Flemming
c. Thomas Hunt Morgan

Ans. a. Oscar Hertwig discovered meiosis.
b. Walther Flemming discovered mitosis.
c. Thomas Hunt Morgan discovered crossing over.


(ix) Draw a labeled graph to show the working of an enzyme in lowering the activation energy of a chemical reaction.

Ans.


(x) Write down major steps of Calvin cycle.

Ans. Major Steps of Calvin Cycle
• CO2 molecules are combined with 5-carbon compounds to form 2 temporary 6-carbon
compounds, each of which splits into two 3- carbon compounds.
• The 3-carbon compounds are reduced to 3-carbon carbohydrates by using ATP and hydrogen
from NADPH. The 3-carbon carbohydrates are used to manufacture glucose.
• The 3-carbon carbohydrates are also used to regenerate the original 5-carbon compounds. This
step also utilizes ATP.


(xi) Describe the process of lactic acid fermentation.

Ans. Lactic Acid Fermentation: It occurs in the skeletal muscles of humans and other animals during extreme physical activities. This also happens in the bacteria present in milk. In this type of anaerobic respiration, each pyruvic acid molecule is converted into lactic acid (C2H6O3).
Pyruvic acid  →  Lactic acid


(xii) What are the photosynthetic pigments? Write down their role in the process of photosynthesis.

Excluded from Syllabus for Annual Exam 2021


(xii) Describe the role of potassium ion in the opening and closing of stomata. 

Excluded from Syllabus for Annual Exam 2021


(xii) How does human heart work as double pump?

Ans. The human heart works as a double pump. It receives deoxygenated (with less oxygen) blood from
the body and pumps it to the lungs. At the same time, it receives oxygenated (with more oxygen) blood
from the lungs and pumps it to all the body. Inside heart chambers, the deoxygenated and oxygenated
bloods are kept separated.


(xii) Differentiate between the atherosclerosis and arteriosclerosis.

Excluded from Syllabus for Annual Exam 2021


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