Past Paper 2025 12th Class Karachi Board Botany Objective (Science Pre-Medical Group)

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BOTANY 2025

(Science Pre-Medical Groups)

TIME: 2 Hours (40 Marks)

SECTION 'A' (Multiple Choice Questions)(8)

NOTE: i) This section consists of 16 part questions and all are to be answered. Each part question carries ½ mark.
ii) Do not copy the part questions in your answer book. Write only the answer in full against the proper number of the question and its part.

1 Choose the correct answer for each from the given options:

i) Process where information present on gene is used to produce a functional product by living organism is called:
*Transcription *Translation
*Gene expression✓ *Mutation

ii) It is a condition of true colour blindness:
*Monochromacy✓ *Dichromacy
*Trichromacy *Haemophilia

iii) Organs with similar functions but different in their anatomical features are termed as:
*Analogous organs✓ *Homoglous organs
*Exterior organs *Interior organs

iv) Conversion of nitrates into nitrogen is called:
*Nitrification *Denitrification✓
*Ammonification *Nitrogen fixation

v) The water cycle begins with the process of:
*Transpiration *Combustion
*Evaporation✓ *Decomposition

vi) The protein that prevents the rebinding of complementary DNA strand during replication fork is called:
*DNA Helicase *Ligase
*SSB (Single Stranded Binding Protein)✓ *Primase

vii) Ecological succession occurring in Arid environments like deserts, mountain and dunes is known as:
*Hydrarch *Xerarch✓ *Secondary *Primary

viii) This type of culture is used to produce disease free plants from infected plant material:
*Meristem culture ✓ *Embryo culture
*Ovary culture *Anther culture

ix) This type of cell culture involves the isolation of cells directly from animal tissues and their growth in vitro:
*primary cell culture✓ *cell line culture
*3D culture *cloning

x) The second stage of Xerarch stage succession is:
*Crustose-Lichens stage *Foliase-Lichens stage ✓
*Herb stage *Moss stage

xi) Mutation in which genes are mutated in normal pattern without any harmful effect:
*Positive mutation *Negative mutation
*Neutral mutation ✓ *Linkage

xii) The Endosymbiotic theory was suggested by:
*Lynn Margulis ✓ *Darwin *Lamarck *Malthus

xiii) The gene which interferes of masks the phenotype of the non-locus gene is called:
*Mutant gene *Epistatic gene✓ *Pleiotropy *Sex-linked

xiv) The alleles of holandric genes is located on:
*X-chromosome *Y-chromosome ✓
*Both X and Y chromosomes *Autosome

xv) According to the International Society of Blood Transfusion, the number of system of blood groups are:
*5 *10 *15 *more than 30 ✓

xvi) Transgenic plant used in biofuel production is:
*Cord grass *Lemon grass
*Switch grass✓ *Glasswort

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