CUET · BIOLOGY · PYQ PAPER 2023
Select the gases which combined with oxygen to form water, carbon dioxide and others organic compounds earlier on earth
- A Ammonia and Methane
- B Ammonia and Hydrogen
- C Methane and Hydrogen
- D Methane and Ozone
Answer & Solution
Correct Answer
(A) Ammonia and Methane
Step-by-step Solution
Detailed explanation
Ammonia and Methane
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from BIOLOGY
- Read the passage carefully and answer the given questions.
Recombinant DNA Technology Asexual reproduction preserves the genetic information, while sexual reproduction permits variation. Traditional hybridization procedures used in plants and animals breeding very often lead to inclusion and multiplication of undesirable genes along with the desired genes. The techniques of genetic engineering, which include creation of recombinant DNA, use of gene cloning and gene transfer, overcome this limitation and allow us to isolate and introduce only one or a set of desirable genes without introducing genes into the target organism.
Which one of the following options is correct for working of restriction enzymes?CUET 2023 Easy - Arrange the following steps of Polymerase Chain Reaction in correct sequence.
A. Annealing of Primer
B. Denaturation of dsDNA
C. Extension of Primer
D. Amplification
Choose the correct answer from the options given below:CUET 2023 Medium - Which one of the following infections is completely curable?CUET 2023 Medium
- Match List I with List II
List I
(Technique/term)List II
(Features)(A) Amniocentesis (I) Ligation of fallopian tube (B) Maternal mortality rate (II) Ligation of vas deferens (C) Vasectomy (III) Death rate (D) Tubectomy (IV) Testing of sex
Choose the correct options:CUET 2025 Easy - Statins are produced by the yeast -CUET 2025 Easy
- The Convention on Biological Diversity held in Rio de Janeiro in 1992 is
popularly known asCUET 2025 Medium
More PYQs from CUET
- Rakshita plans to buy a house for Rs. 1,00,00,000 with down payment of 20% of the value of the house paid by her mother. Rest of the amount she wishes to pay in 25 years by equal monthly instalments at an interest of 9% per annum compounded monthly Then the EMI paid by her is \(\left(\right.\) Given \(\left.(1.0075)^{300}=9\right)\) :CUET 2025 Medium
- As astronomical telescope of ten fold angular magnification has a length of 44 cm. The focal length of the objective is:CUET 2023 Easy
- The net primary productivity (NPP) in an ecosystem can be represented by:CUET 2025 Easy
- Match List-I with List-II
List-I
(Enzymes)List-II
(Products)(A) RNA polymerase I (I) hnRNA (B) RNA polymerase III (II) hydrolysis of lactose (C) RNA polymerase II (III) rRNA (D) \( eta\)-galactosidase (IV) tRNA, 5SrRNA, snRNA
Choose the correct answer from the options given below:CUET 2025 Easy - Read the following paragraph carefully and answer the given questions.
Certain types of leukocytes (WBC) of our body like polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes. For determining the cause of allergy, the patient is exposed to or injected with very small doses of possible allergens, and the reactions studied. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Heroin, commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine. Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the internal organs. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria. Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal.
Which one of the following drugs can not quickly reduce the symptoms of allergy?CUET 2023 Easy - Study the following figure and answer the questions:

AUG codes for which amino acid?CUET 2023 Hard