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PSEB XII
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Biology
List of top Biology Questions asked in PSEB XII
Darwin observed a variety of beaks in small black birds inhabiting Galapagos Islands. Explain what conclusions did he draw and how ?
PSEB XII - 2025
PSEB XII
Biology
Evolution
Draw a labelled diagram showing the structure of an antibody molecule.
PSEB XII - 2025
PSEB XII
Biology
Human health and disease
How do methanogens help in producing biogas ?
PSEB XII - 2025
PSEB XII
Biology
Microbes in human welfare
DNA being hydrophilic cannot pass through the cell membrane of a host cell. Explain how the host cell is made 'competent' to take up the recombinant DNA ?
PSEB XII - 2025
PSEB XII
Biology
Biotechnology
Why is it essential to have ‘selectable marker’ in a cloning vector ?
PSEB XII - 2025
PSEB XII
Biology
Biotechnology
Discuss the nature of genetic code.
PSEB XII - 2025
PSEB XII
Biology
Molecular Basis of Inheritance
How did Hershey and Chase differentiate between DNA and protein in their experiment while proving that DNA is the genetic material ?
PSEB XII - 2025
PSEB XII
Biology
Molecular Basis of Inheritance
What is incomplete dominance ? Give an example.
PSEB XII - 2025
PSEB XII
Biology
Principles of Inheritance and Variation
What is meant by emasculation ? How is it useful in plant breeding programme ?
PSEB XII - 2025
PSEB XII
Biology
sexual reproduction in flowering plants
Amniocentesis for sex determination is banned in our country. Is this ban necessary ? Comment.
PSEB XII - 2025
PSEB XII
Biology
Reproductive Health
Draw labelled diagram for the structure of human sperm.
PSEB XII - 2025
PSEB XII
Biology
Human Reproduction
What do you mean by ‘Rivet Popper’ hypothesis ?
PSEB XII - 2025
PSEB XII
Biology
Biodiversity and Conservation
Write any two points of difference between grazing food-chain and detritus food-chain.
PSEB XII - 2025
PSEB XII
Biology
Ecosystem
Briefly describe Zygote Intra Fallopian Transfer (ZIFT) technique practice to help infertile couples.
PSEB XII - 2025
PSEB XII
Biology
Reproductive Health
Expand GEAC. What is the responsibility of GEAC, set up by the Indian Government.
PSEB XII - 2025
PSEB XII
Biology
Biotechnology
Lactational amenorrhea and coitus interruptus are __________ methods of birth control.
PSEB XII - 2025
PSEB XII
Biology
Reproductive Health
The ability of malignant tumors to spread to distant sites in the body through the blood is called __________.
PSEB XII - 2025
PSEB XII
Biology
Human health and disease
Antibiotics are chemical substances produced by some microbes that can kill or inhibit disease-causing microbes.
PSEB XII - 2025
PSEB XII
Biology
Microbes in human welfare
Thymus increases in size with age and reaches its maximum size during puberty.
PSEB XII - 2025
PSEB XII
Biology
Human health and disease
The introduction of alien species usually enhances biodiversity by adding stability to native ecosystems.
PSEB XII - 2025
PSEB XII
Biology
Biodiversity and Conservation
Simple shake flasks are more effective than stirred-tank bioreactors for producing large quantities of recombinant proteins.
PSEB XII - 2025
PSEB XII
Biology
Biotechnology
The following are some of the well-known fossils in the evolution of modern man :
$\bullet$ Homo habilis
$\bullet$ Homo erectus
$\bullet$ Homo sapiens
$\bullet$ Australopithecus
The correct sequence of their origin is :
PSEB XII - 2025
PSEB XII
Biology
Evolution
The pyramid of ________ is always upright and can never be inverted.
PSEB XII - 2025
PSEB XII
Biology
Ecosystem
X and Y are two birth control methods, commonly called sterilization methods. X and Y are generally advised for the male and female partner respectively to prevent pregnancies. These techniques are highly effective. Identify X and Y.
PSEB XII - 2025
PSEB XII
Biology
Reproductive Health
The structure that provides vascular connection between the foetus and uterus is called ________.
PSEB XII - 2025
PSEB XII
Biology
Human Reproduction
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