Practice authentic previous years' questions for Physics, Chemistry, Botany, and Zoology with step-by-step NCERT-aligned solutions and full-width diagram references.
Marking pattern: +4.00 positive, -1.00 negative (Official NTA NEET Scheme).
Which of the following statements are correct regarding amino acids?
A. They are substituted methanes.
B. Serine is an aromatic amino acid.
C. Valine is a neutral amino acid.
D. Lysine is an acidic amino acid.
Choose the correct answer from the options given below:
"The Evil Quartet" of biodiversity loss includes which of the following?
Match List-I with List-II:
| List-I (Process) | List-II (Location) |
|---|---|
| A. Glycolysis | I. Inner mitochondrial membrane |
| B. ETS | II. Mitochondrial matrix |
| C. Accumulation of protons | III. Cytoplasm |
| D. Krebs' cycle | IV. Intermembrane space |
Which one of the following is a triploid cell?
Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?
Match List I with List II:
| List I (Placentation) | List II (Example) |
|---|---|
| A. Marginal | I. Mustard |
| B. Axile | II. Pea |
| C. Parietal | III. Marigold |
| D. Basal | IV. Lemon |
The main criteria used for Five Kingdom Classification proposed By R.H. Whittaker (1969) included :
A. Cell structure
B. Body organization
C. Presence of flagellum
D. Reproduction
E. Phylogenetic relationships
Choose the correct answer from the options given below :
Match List I with List II:
| List I | List II |
|---|---|
| A. Trypsin | I. Intercellular ground substance |
| B. Morphine | II. Lectin |
| C. Concanavalin A | III. Enzyme |
| D. Collagen | IV. Alkaloid |
Which of the following statements are correct with respect to DNA separation, isolation and visualization?
A. The cutting of DNA is done by molecular scissors.
B. The DNA fragments separate according to their size in an agarose gel, upon electrophoresis.
C. The separated DNA fragments can be seen without staining when exposed to UV light.
D. The separated DNA fragments, when stained with ethidium bromide, can be seen in visible light.
Choose the correct answer from the options given below:
Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?
Match List I with List II:
| List-I | List-II |
|---|---|
| A. Cortisol | I. Stimulates the formation of alveoli in mammary glands |
| B. Aldosterone | II. Produces anti-inflammatory reactions |
| C. Cholecystokinin | III. Stimulates reabsorption of NaβΊ and water from renal tubule |
| D. Progesterone | IV. Stimulates secretion of pancreatic enzymes and bile juice |
Arrange the following events occurring in Renin-Angiotensin mechanism in the correct order:
A. Increase in blood pressure and Glomerular filtration rate
B. Reabsorption of NaβΊ and water from distal parts of tubule due to Aldosterone
C. Fall in Glomerular filtration rate
D. Vasoconstriction by Angiotensin II and release of Aldosterone.
E. Renin converts Angiotensinogen into Angiotensin I, followed by Angiotensin II.
Choose the correct answer from the options given below:
In humans, respiration occurs in the following steps. Arrange these steps in the correct order.
A. Diffusion of Oβ and COβ between blood and tissues
B. Diffusion of Oβ and COβ across alveolar membrane
C. Pulmonary ventilation by which atmospheric air is drawn in and COβ rich alveolar air is released out
D. Cellular respiration
E. Transport of gases by the blood
Choose the correct answer from the options given below:
The following are the stages of life cycle of Plasmodium. Arrange the stages in the proper order.
A. The parasites reproduce asexually in RBCs, bursting the cells.
B. The parasites reproduce asexually in liver cells, bursting the cells and releasing into blood.
C. Gametocytes develop in RBCs.
D. Sporozoites reach the liver through the blood.
E. Female mosquito injects sporozoites into humans during bite.
Choose the correct answer from the options given below:
Insertion of a foreign DNA at BamHI site in an E.coli cloning vector pBR322 results in the loss of antibiotic resistance towards:
The following reaction depicts the activity of a particular class of enzymes :
$$\begin{matrix} \text{X} & \text{Y} \\ | & | \\ \text{C} & - & \text{C} \end{matrix} \xrightarrow{\text{E}} \text{X}-\text{Y} + \text{C}=\text{C}$$
Identify the enzymes class 'E' from the following options :
The specific receptors for neurotransmitters in a synapse are present on
What is the probability of having children with 'O' blood group, where both mother and father are heterozygous for 'A' and 'B' blood group, respectively?
Match List I with List II:
| List I (Respiratory Volume) | List II (Capacity in mL) |
|---|---|
| A. ERV (Expiratory Reserve Volume) | I. 2500-3000 mL |
| B. RV (Residual Volume) | II. 500 mL |
| C. IRV (Inspiratory Reserve Volume) | III. 1000-1100 mL |
| D. TV (Tidal Volume) | IV. 1100-1200 mL |
Which of the following is not an example of convergent evolution?
Male frogs can be distinguished from female frogs due to the presence of
A. Bulging eyes
B. Vocal sacs
C. Webbed digits in feet
D. Copulatory pad on first digit of fore limbs
E. Olive green-coloured skin with dark irregular spots
Choose the correct answer from the options given below :
A group of researchers procured some fish like animals and upon investigation the following characters were observed:
A. Endoskeleton was made of cartilage.
B. Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth.
C. Paired fins and scales were absent, but 7 pairs of gill slits were present.
Which of the following species of animals did they consider to fit best with these characters?
Match List I with List II with respect to chronology of evolution of life forms:
| List I | List II |
|---|---|
| A. About 65 mya | I. Jawless fish probably evolved |
| B. About 500 mya | II. The dinosaurs suddenly disappeared from the earth |
| C. About 350 mya | III. Seaweeds and few plants probably existed |
| D. About 320 mya | IV. Invertebrates were formed and became active |
Match List I with List II:
| List I | List II |
|---|---|
| A. Progestasert | I. Barrier made of rubber used by females |
| B. Multiload 375 | II. Oral contraceptive |
| C. Diaphragm | III. Hormone releasing IUD |
| D. Saheli | IV. Copper releasing IUD |
The WBC count of a person's blood sample is 8000/cu mm. How many eosinophils and lymphocytes would be in the same blood sample approximately?