CUET 2025 Biology Question Paper & Answer Key PDF Available: Exam Analysis & Memory Based Questions

The Rivet Popper Hypothesis highlights the importance of which of the ecological concepts?

Spermatogenesis in humans begins at:
A. Birth
B. Puberty
C. Embryonic stage
D. Menopause

Which of the following cells is haploid during human spermatogenesis?
 A. Spermatogonium
 B. Primary spermatocyte
 C. Secondary spermatocyte
 D. Sertoli cell

Oogenesis in females is initiated during which stage of life?
 A. Puberty
 B. Embryonic development
 C. Adulthood
 D. Menarche

How many functional ova are typically produced from one primary oocyte?
 A. 4
 B. 2
 C. 1
 D. 3

The second meiotic division in oogenesis is completed:
 A. Before ovulation
 B. After fertilization
 C. At puberty
 D. In the Graafian follicle

A trait that is expressed only when both alleles are identical is called:
 A. Dominant
 B. Codominant
 C. Recessive
 D. Incomplete dominant

Which of the following is an example of sex-linked recessive inheritance?
 A. Huntington’s disease
 B. Sickle cell anaemia
 C. Colour blindness
 D. Thalassemia

Which of the following is a chromosomal disorder caused by nondisjunction during meiosis?
 A. Haemophilia
 B. Klinefelter syndrome
 C. Sickle cell anaemia
 D. Phenylketonuria

Down syndrome is caused due to:
 A. Trisomy of chromosome 21
 B. Monosomy of X chromosome
 C. Deletion of chromosome 5
 D. Trisomy of chromosome 18

Name the plant hormone that promotes fruit ripening.

Which hormone is called the 'stress hormone' in plants?

Gibberellins are used commercially for:

a) Delaying senescence

b) Promoting seed dormancy

c) Breaking seed dormancy

d) Enhancing photosynthesis

How many nuclei are present in a typical angiosperm embryo sac at maturity?
Options:
A. 6
B. 7
C. 8
D. 9

Which of the following organisms is used as a biofertilizer for rice crops?
Options:
A. Rhizobium
B. Azotobacter
C. Azolla
D. Nostoc

Which of the following is an example of ecological succession?
Options:
A. Growth of algae in a pond over time
B. Rapid blooming of flowers after rainfall
C. Seasonal migration of birds
D. Daily movement of sunflower towards sunlight

In which part of the female reproductive system does fertilization usually occur?
Options:
A. Cervix
B. Uterus
C. Vagina
D. Fallopian tube

Which hormone reaches peak concentration during the ovulatory phase of the menstrual cycle?
Options:
A. Progesterone
B. Follicle-stimulating hormone (FSH)
C. Estrogen
D. Luteinizing hormone (LH)

Which of the following best describes an organism’s ecological niche?

A. The specific location where an organism lives
B. The role and position a species has in its environment, including its interactions with other species
C. The total number of individuals in a species
D. The food that an organism eats

What was the main conclusion of the Hershey-Chase experiment conducted in 1952?

A. Proteins are the genetic material in viruses
B. DNA is the genetic material responsible for heredity
C. RNA can replicate independently in cells
D. Viruses cannot infect bacteria

• The overall difficulty level of the examination was moderate to difficult.
• Questions were asked from topics like genetics, mendelian disorders, chromosomal disorders, polygenic inheritance and inheritance pattern and variations. 

• Passage-based questions were asked on Biodiversity and conservation topics. 

   

• A biotechnology-based question on EcoRI enzyme was asked.

• The overall difficulty level of the examination was easy to moderate.
• The examination was comparatively lengthy.
• Questions were direct and NCERT-based. 
• Questions were asked on topics like Biodiversity, ecosystem and reproduction. 

• The overall difficulty level of the examination was moderate.
• Questions were asked from Mendelian inheritance laws and common gene disorders.
• Situational questions on brood parasitism were asked
• Enzyme function questions included the role of DNA

• The overall difficulty level of the examination was moderate.
• Questions were NCERT-based.
• Questions were asked from Human Physiology, Genetics, Biotechnology, and Ecology. 

• The overall difficulty level of the examination was easy. 
• Questions were asked from the topics Ecology and Environment Studies
• Rivet Popper Hypothesis was asked from the ecology section. 
• Topics namely spermatogenesis and oogensis were asked from the reproduction section. 

• The overall difficulty level of the examination was moderate. 
• Questions were asked from Microbes in Human Welfare
• Questions from the Human Evolution section were direct 
• A question based on the Vidal Test was included
• The overall question paper was NCERT-based. 

• The overall difficulty level was Moderate. 
• Students mentioned that the paper was highly scoring and the questions were NCERT-based. 
• Topics were asked from plant hormones, placenta and stages of human reproduction. 

• The overall difficulty level of the examination was moderate. 
• The questions were asked from embryo sac. 
• Spermatogenesis was covered with a question. 
• Gel electrophoresis was asked in the examination. 
• Questions were also asked from Ecology and population concepts. 

• The overall difficulty level of the exam was easy. 
• Questions were asked about human reproduction, menstrual cycle and spermatogenesis. 
• Questions from nucleosides, trascription units were asked. 

• The overall difficulty level of the exam was moderate. 
• Questions were asked from Hershey-Chase experiment. 
• A question in paragraph form was asked from biotechnology principles. 
• Spermatogenesis involved a statement-based MCQ.
• The question on ecological niche was asked.

CUET UG 2025 Biology Exam

Between May 13 to June 3, 2025

Number of Slots

Two

Mode of examination

Computer Based Test