The CUET Biology 2025 exam was scheduled from 13th May to 3rd June, with access to the question paper, answer key, and solutions available to download here. The topics included cell biology, genetics, ecology, physiology, reproduction, and biodiversity.
Candidates had to answer 50 questions in 60 minutes. The paper totaled 250 marks, with +5 marks awarded for each correct answer and –1 mark deducted for each incorrect answer.
CUET UG Biology 2025 Question Paper with Solutions PDF
| CUET UG Biology Question Paper with Solutions PDF | Download PDF | Check Solutions |
Which one of the following guides the entry of the pollen tube into the embryo sac?
Antibody molecule has:
Choose the correct equation from the following options to show the correct relationship between Gross Primary Productivity (GPP), Respirational Losses (R), and Net Primary Productivity (NPP).
Which one of the following is opposite part of micropylary end of ovule?
Which type of innate immunity is exhibited by interferons secreted by virus-infected cells to protect non-infected cells?
The process of copying genetic information from one strand of DNA into RNA is termed as -
Arrange the following events in the correct order pertaining to fertilization in the human reproductive system.
(A) The blastocyst becomes embedded in the endometrium.
(B) Finger-like projections appear on the trophoblast called chorionic villi.
(C) The blastomeres are arranged into trophoblast and the inner cell mass.
(D) The zygote divides mitotically and transforms into an embryo with 8-16 blastomeres, called a morula.
Which of the following are not involved in intra uterine devices?
Which one of the following is not associated with the process of transcription in bacteria?
Which of the following disorders are the results of aneuploidy?
Which one of the following options will express intermediate skin colour in an individual?
Which of the following is incorrect with reference to drug abuse?
Arrange the given steps involved in gel electrophoresis used for separation of DNA fragments?
EcoRI, a significant tool in rDNA technology is -
Arrange the following geological periods in their occurrence from latest to oldest order.
Which of the following steps are related to polymerase chain reaction (PCR)?
Baculoviruses are pathogens that attack:
The number of individuals in the reproductive age group is more than the number of individuals in the pre-reproductive age group, the shape of its age pyramid would reflect the growth status of the population as:
Which of the following statements are true with reference to homology or homologous organs?
Arrange the following groups of plants according to their appearance on earth.
If a man is eating fish as his food, which trophic level is occupied by him in the food chain?
Thorn of Bougainvillea and tendril of Cucurbita are:
A small standing crop of phytoplankton supports a large standing crop of zooplankton. This can be correctly represented by:
The first isolated restriction endonuclease was:
Arrange the given products formed during sewage treatment in correct sequence:
Wildlife safari parks are example of-
Humification leads to:
If a double-stranded DNA has 15% of adenine, find out the percent of cytosine in the DNA?
Transgenic animals are used to understand the contribution of genes in the development of diseases such as:
Genetically modified plants have been useful in:
Which of the following is the primary female sex organ?
Which one of the following structures is haploid (n) in relation to the male reproductive system?
Of the incident solar radiation, what is the percentage of photosynthetically active radiation (PAR)?
ELISA is based on the principle of:
Read the passage carefully and answer the questions based on the passage:
Passage: Species diversity on earth is not uniformly distributed. It is generally highest in the tropics and decreases towards the poles. Earth’s fossil history reveals the incidence of mass extinctions in the past. Earth’s rich biodiversity is vital for the very survival of mankind. It is believed that communities with high diversity tend to be less variable and more productive. The reasons of conserving biodiversity are narrowly utilitarian, broadly utilitarian and ethical. Biodiversity conservation may be in situ as well as ex-situ.
Question 41:
Which of the following is not included in in-situ conservation?
View Solution
In-situ conservation refers to the conservation of species in their natural habitats. It is a strategy for preserving biodiversity in the wild.
Step 1: Analyzing the options.
- **Zoological park (Option 1)**: A zoological park, also known as a zoo, is an example of **ex-situ conservation**, where species are conserved outside their natural habitats in controlled environments.
- **National park (Option 2)**: A national park is a protected area for the conservation of wildlife and natural habitats in the wild, making it an example of **in-situ conservation**.
- **Wildlife sanctuary (Option 3)**: A wildlife sanctuary is another example of **in-situ conservation**, where species are protected in their natural environments.
- **Biosphere reserves (Option 4)**: Biosphere reserves are designated areas that conserve biodiversity in natural ecosystems and are also examples of **in-situ conservation**.
Step 2: Conclusion.
The zoological park is not part of **in-situ conservation**, as it involves the conservation of species outside their natural habitats.
Final Answer: \[ \boxed{The correct answer is (A) Zoological park.} \] Quick Tip: In-situ conservation involves protecting species in their natural habitats, while ex-situ conservation involves conserving species outside their natural environments, such as in zoos or botanical gardens.
Which one of the following does not exhibit narrowly utilitarian argument for conserving biodiversity?
Which of the following might not account for the greater biological diversity in the tropic region?
How many episodes of mass extinction of species have occurred since the origin and diversification of life on earth?
Which of the following hot spots does not cover India's biodiversity regions?
Read the passage carefully and answer the questions based on the passage:
Passage: Pollen pistil interaction involves all events from the landing of pollen grains on the stigma until the pollen tube enters the embryo sac (when the pollen is compatible). When a pollen tube grows through the style and enters into the ovules, it finally discharges two male gametes in one of the synergids. Syngamy and triple fusion are two fusion events that occur in angiosperms. Thus, angiosperms exhibit double fertilization. The products of these fusions are the diploid zygote and triploid primary endosperm nucleus. Zygote develops into embryo and primary endosperm cell forms the endosperm tissue. The developing embryo passes through different stages before maturation.
Question 46:
With reference to reproduction in flowering plants, which one of the following is incorrect?
View Solution
In the process of fertilization in angiosperms, the pollen tube releases male gametes into the ovule where two fusion events take place: syngamy (fusion of male and female gametes) and triple fusion (fusion of the second male gamete with the two polar nuclei, forming the triploid endosperm nucleus).
Step 1: Analyzing the options.
- **Endosperm develops into seed (Option 1)**: This statement is incorrect. The **endosperm** develops into the **nutritive tissue** that nourishes the developing embryo, not into the seed itself. The seed consists of the embryo, seed coat, and endosperm (nutritive tissue).
- **Ovary develops into fruit (Option 2)**: This is correct. After fertilization, the ovary develops into a fruit that encloses the seeds.
- **Ploidy of PEN is 3n (Option 3)**: This is correct. The ploidy of the primary endosperm nucleus (PEN) is triploid (3n), as it is formed by the fusion of one male gamete with the two polar nuclei.
- **Syngamy is the fusion of male and female gametes (Option 4)**: This is correct. Syngamy refers to the fusion of the male and female gametes, resulting in the formation of a diploid zygote.
Step 2: Conclusion.
The statement that **endosperm develops into seed** is incorrect. Endosperm develops into nutritive tissue, not the seed itself.
Final Answer: \[ \boxed{The correct answer is (A) Endosperm develops into seed.} \] Quick Tip: In flowering plants, the endosperm nourishes the developing embryo, but it does not directly develop into the seed. The seed is composed of the embryo, endosperm, and seed coat.
Which of the following is not a stage of growing embryo in dicotyledon plants?
The coconut water from tender coconut, a good source of nutrition, is nothing but:
Formation of diploid zygote is a result of:
If there are 38 chromosomes in the zygote, how many chromosomes will there be in its haploid egg cell?
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