NEET Biology questions with solutions

Q1. An anti-forest measure is

1. Afforestation
2. Selective grazing
3. Clearing forest
4. Selective felling

Answer: Clearing forest

Clearing forest directly removes trees and vegetation, which is counter to preserving or maintaining forests.

Q2. Fern plants reproduce by

1. Seeds
2. Spores
3. Laying eggs
4. Giving birth to young fern plants

Answer: Spores

Ferns reproduce via spores, which are small reproductive units that grow into new plants under suitable conditions.

Q3. In rabbit and humans, the kidney is

1. Metanephric
2. Mesonephric
3. Pronephric
4. Opisthonephric

Answer: Metanephric

The metanephric kidney is the fully developed, functional kidney in adult reptiles, birds, and mammals, including rabbits and humans.

Q4. Snake's venom is

1. Alkaline in reaction
2. Acidic in reaction
3. Alkaline and rich fatty acids
4. Acidic and rich fatty acids

Answer: Acidic in reaction

Snake venom is acidic because its enzymes and toxins function optimally in acidic environments, aiding in tissue breakdown and prey immobilization.

Q5. Hydra reproduces by budding. This is an example of

1. Asexual reproduction
2. Sexual reproduction
3. Regeneration
4. Parthenocarpy

Answer: Asexual reproduction

Hydra forms a new organism by budding, where a small outgrowth develops from the parent and separates. Since no fusion of sex cells occurs, this is asexual reproduction.

Q6. If a plant cell is placed in deionised water, the water potential of that cell becomes

1. More positive because pressure potential becomes more positive
2. More positive because pressure potential becomes more negative
3. More negative because pressure potential becomes more negative
4. Less negative because pressure potential becomes more positive

Answer: Less negative because pressure potential becomes more positive

Deionised water has a higher water potential than the cell, so water enters by osmosis. This increases the cell’s pressure potential (turgor), which makes the cell’s overall water potential less negative.

Q7. Hemoglobin in the RBCs helps in the

1. Transport of oxygen
2. Transport of nutrients
3. Transport of carbon dioxide
4. Both A and C

Answer: Both A and C

Hemoglobin’s primary role is to carry oxygen from the lungs to tissues. It also helps transport carbon dioxide back to the lungs, so the best choice includes both gases.

Q8. In male grasshoppers and moths, there are two pairs of autosomes and

1. \( x \) only
2. x and
3. Y only
4. None of the above

Answer: x and

In male grasshoppers and moths, the sex-determination system is XO: males have two pairs of autosomes plus a single X chromosome. There is no Y chromosome in this system, so the missing sex chromosome is represented by the X alone.

Q9. consider the following statements each with one or two blanks. (i) The ascending limb of loop of Henle is impermeable to (1) but allows transport of (2) (ii) (3) and (4) play a significant role in producing a concentrated urine. (iii) A fall in glomerular blood flow/glomerular blood pressure/GFR can activate the JG cells to release (5) Which one of the following options correctly fills the blanks in any two of the statements?

1. (1)-water, (2)-electrolytes, (5)-renin
2. (3)-Henle's loop, (4)-vasa recta, (5)-angiotensin
3. (1)-electrolytes, (2)-water, \( (3)- \) РСТ, \( (4)- \) DCT
4. (3)-Henle's loop, (4)-vasa recta, (5)-angiotensinogen

Answer: (1)-water, (2)-electrolytes, (5)-renin

The ascending limb of Henle’s loop is impermeable to water but actively transports electrolytes, so (1) = water and (2) = electrolytes. Also, a fall in renal perfusion/GFR stimulates juxtaglomerular cells to release renin, not angiotensin or angiotensinogen.

Q10. Cork is used for insulation and acts as shock absorber because

1. It is porous
2. It is very hard
3. It is light and does not catch fire easily
4. The cells of cork are living

Answer: It is porous

Cork has many tiny pores filled with air. Air is a poor conductor of heat and the porous structure also helps absorb shocks, so cork works well as an insulator and shock absorber.

Q11. Assertion Double circulation is incomplete in amphibians and reptiles Reason Unlike in birds and mammals, in amphibian and reptiles, the left atrium receives oxygenated blood and right atrium receives deoxygenated blood.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Answer: Assertion is correct but Reason is incorrect

The assertion is correct because amphibians and most reptiles do not have complete separation of oxygenated and deoxygenated blood, so double circulation is incomplete. The reason is incorrect because the atrial blood pattern described is not the distinguishing issue here, and it does not accurately explain the incompleteness.

Q12. I. Increase in mass II. Differentiation III. Increase in number of individuals. IV. Response to stimuli Which two points are known as the twin characteristics of growth?

1. I and II
2. II and IV
3. II and III
4. I and III

Answer: I and II

Growth is typically defined by an increase in mass and by differentiation during development. Increase in number of individuals is reproduction, and response to stimuli is a general life characteristic, not a twin characteristic of growth.

Q13. ICBN was adopted in

1. 1951
2. 1971
3. 196
4. 1981

Answer: 1951

The International Code of Botanical Nomenclature (ICBN) was adopted in 1951, marking the formal acceptance of standardized rules for naming plants. This date is the one associated with the code’s adoption, not later revisions or related meetings.

Q14. The only plant cells without nucleus among the following is

1. Cambium cells
2. Root hair
3. companion cells
4. Xylem vessels

Answer: Xylem vessels

Xylem vessels are dead at maturity, so they lack a nucleus and other cell contents. Cambium cells, root hair cells, and companion cells are living cells and therefore contain a nucleus.

Q15. Which of the following characteristics can be related to cartilaginous joints?

1. Permit slight movements
2. Are found between the bodies of vertebrae
3. Are found in symphysis
4. All of the above

Answer: All of the above

Cartilaginous joints are united by cartilage, so they allow only slight movement. They include symphyses and are found between vertebral bodies, so each listed characteristic applies.