Sindh Botany 2024 Model Paper — Solved MCQs

Question 1

The removal of floating solid and organic materials from the sewage is:

Accepted Answer

A. Primary treatment — Primary treatment focuses on the removal of floating solids and organic materials from the sewage. It involves allowing the sewage to pass slowly through a basin, where heavy solid materials settle down. This stage is often carried out in a primary sedimentation tank.

Question 2

The fungi that gives puff appearance to dough is called:

Accepted Answer

D. Saccharomyces — Bread dough contains yeast, specifically Saccharomyces cerevisiae, which undergoes fermentation. During fermentation, yeast produces carbon dioxide (CO2) and ethyl alcohol. The CO2 gas creates air pockets in the dough, giving it a puffy and soft texture once baked.

Question 3

The significance of Polymerase Chain Reaction (PCR) is:

Accepted Answer

D. Amplifying specific DNA fragment — PCR is a very sensitive technique that allow rapid amplification of specific DNA segment PCR makes billions of copies of a specific DNA fragment or gene, which allows detection and identification of gene sequences using visual techniques based on size and charge.

Question 4

Gel electrophoresis is a technique used to separate DNA fragments based on size. What is the significance of gel

Accepted Answer

D. Sequence DNA — Gel electrophoresis is a laboratory method used to separate mixtures of DNA, RNA, or proteins according to molecular size. In gel electrophoresis, the molecules to be separated are pushed by an electrical field through a gel that contains small pores.

Question 5

Genomic map are useful for:

Accepted Answer

A. Identifying genes associated with specific diseases — Genetic mapping - also called linkage mapping - can offer firm evidence that a disease transmitted from parent to child is linked to one or more genes. Mapping also provides clues about which chromosome contains the gene and precisely where the gene lies on that chromosome.

Question 6

The significance of Monoclonal antibodies is:

Accepted Answer

B. Diagnosed diseases — Monoclonal antibodies are being used in the diagnosis and treatment of many diseases, including some types of cancer. They can be used alone or to carry drugs, toxins, or radioactive substances directly to cancer cells.

Question 7

The source of carbon to plant in the carbon cycle is:

Accepted Answer

C. Atmospheric carbon dioxide — Plants take the atmospheric carbon dioxide in presence of Sunlight and do photosynthesis and produce glucose and oxygen as a byproduct. The plants are not able to take carbon directly from carbonate rocks and fossil fuels.

Question 8

The pioneers in Xerarch succession are the:

Accepted Answer

C. Crustose lichens — . Crustose lichens, which appear on the rock surface as membranous crusts, are the first organisms to occupy the bare area. The crustose lichens Rhizocarpus, Lacidea, etc. are significant. They have a porous structure, which allows them to absorb more water and minerals

Question 9

Theory of natural selection lacking any support from:

Accepted Answer

C. Genetics

Question 10

Archaeopteryx is a connecting link between:

Accepted Answer

B. Reptiles and Aves

Question 11

Which of the following would cause phenotype variations among organisms of the same genotype:

Accepted Answer

C. Exposure of different environment

Question 12

A boy is color blind, his mother genotype could be:

Accepted Answer

B. XNY

Question 13

The allele of holandric gene is located at:

Accepted Answer

B. Y-Chromosomes — The alleles of holandric gene are only located at Y-chromosome not on X-chromosome. The Y-linked genes are hemizygous, only located on non-homologous region of Y-chromosome

Question 14

International society of blood transfusion has found:

Accepted Answer

B. More than 30 blood group system — In human beings numbers of different blood group systems are investigated to explain the variability of cells, chemical and its interaction with other blood groups. It is observed and carefully selected at the time of blood transfusion therefore International Society of blood transfusion has found more than 30 types of blood group system. These systems are mainly based on the presence or absence of special molecules found on blood cells. These molecules are mainly present on the surface of R.B.C and belong to the group of conjugated molecules i.e glycoprotein.

Question 15

The Nitrogenous base present in RNA but not in DNA:

Accepted Answer

D. Uracil — The bases in DNA are Adenine (‘A’), Thymine (‘T’), Guanine (‘G’) and Cytosine (‘C’).RNA shares Adenine (‘A’), Guanine (‘G’) and Cytosine (‘C’) with DNA, but contains Uracil (‘U’) rather than Thymine.

Sindh Botany 2024 Model Paper — Solved Past Paper with Answers

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