INBO Animal Science Questions, Practice Problems with Solutions

INBO Animal Science Questions cover a broad and essential spectrum of biology necessary for the Indian National Biology Olympiad. This field involves the study of animal systems, from the molecular behavior of amino acids and proteins to complex hormonal feedback loops and evolutionary mechanisms. Because these questions often integrate multiple disciplines such as biochemistry, immunology, and physiology they require students to possess strong deductive skills and a clear understanding of biological interactions. Mastering these areas is vital for students aiming to qualify for international levels and secure top positions in national competitions.

Here we have compiled essential INBO Animal Science practice questions with detailed solutions based on recent preparatory materials. Students will gain insights into standard Olympiad patterns, learn how to analyze experimental data, and reinforce their understanding of physiological adaptations. This resource serves as a guide for students to prepare for the rigor of high-level biological inquiry.

Also Read: INBO Syllabus

Important INBO Animal Science Questions

This section presents a curated set of important INBO Animal Science questions covering various difficulty levels, including biochemical analysis, hormonal regulation, and genetic frequency.

Question 1: Single Correct (Biochemistry)

Problem: An amino acid has one proton-donating group in the side chain (R). The pK COOH, pK NH2, and pK R values for this amino acid are 2.19, 9.67, and 4.25, respectively. Which one of the following statements about this amino acid is CORRECT?

(A) Majority of the molecules will have a net charge of -1 at pH of 7.0
(B) Majority of the molecules will have a net charge of 0 at pH of 4.25
(C) All the molecules will have a deprotonated R group at pH of 3.22
(D) During titration with a strong base, deprotonation will start with the R group

Answer: (A) Majority of the molecules will have a net charge of -1 at pH of 7.0

Question 2: Matching Type (Endocrinology)

Problem: Match the following disease conditions related to the thyroid feedback loop:
(x) anterior pituitary fails to produce TSH,
(y) thyroid fails to produce T3 T4, and
(z) hypothalamus fails to secrete TRH.

(i) Low TRH, Low TSH, Low T3 T4
(ii) High TRH, High TSH, Low T3 T4
(iii) High TRH, Low TSH, Low T3 T4

Answer: (i)-(z); (ii)-(y); (iii)-(x).

Question 3: Multiple Correct (Virology and Immunology)

Problem: Regarding the structure and infection of a coronavirus (an RNA virus with a lipid-rich envelope), identify the correct or incorrect statements:

(A) Chemical analysis should reveal carbohydrate as a component.
(B) Ethanol treatment denatures viral proteins, rendering it non-infectious.
(C) The N protein is expected to have a net negative charge.
(D) E and M proteins have hydrophobic amino acids on surfaces facing the envelope.

Answer: (C) is often the incorrect statement in such tests as the N (nucleocapsid) protein, which binds to negatively charged RNA, is typically positively charged.

Question 4: Integer Calculation Type (Population Genetics)

Problem: In the MN blood group system, the following data is observed in a population:
Genotype MM = 320, MN = 480, NN = 200 (Total = 1000).
Calculate the frequency of allele M.

Calculation: Frequency of M = [(2 × MM) + MN] divided by (2 × Total)
Frequency of M = [(2 × 320) + 480] divided by 2000 = [640 + 480] divided by 2000 = 1120 divided by 2000 = 0.56

Answer: 0.56

Question 5: Subjective Analytical (Animal Physiology)

Problem: After surgical removal of the pituitary gland to treat gigantism, which hormonal therapies are absolutely necessary for survival?

(i) Thyroid hormone
(ii) Glucocorticoids
(iii) Glucagon
(iv) Growth hormone
(v) Insulin

Solution: The most critical for immediate survival (basal metabolism and stress response) are Thyroid hormone and Glucocorticoids.

Answer: (i) and (ii)

INBO Animal Science Questions PDF Library

Success in biology Olympiads requires exposure to diverse question formats, including experimental data interpretation and pedigree analysis. We have compiled resources from camp practice sets (DPPs) to help you master these concepts. Use the links below to access the INBO Animal Science questions PDF and practice sets.

How to Use Important Solutions for INBO Animal Science for Exam Preparation?

Strategic preparation is key to tackling the high-level analytical questions found in the INBO. Follow these steps to maximize the utility of these resources:

Deep Dive into Physiology: Ensure you understand the mechanisms behind hormonal feedback loops and neural signaling before attempting complex problems.

Analyze Experimental Data: Many INBO questions are based on specific experimental scenarios (e.g., sheep pheromone studies or fish salt management). Practice interpreting these results objectively.

Independent Solving: Always attempt the MCQs and subjective problems without looking at the solutions first to identify gaps in your logic.

Focus on Interactions: Animal science is rarely isolated. Study how the endocrine system interacts with the nervous system and how molecular structures (like hemoglobin or enzymes) dictate physiological function.

Regular Revision: Use the provided solutions to quickly review core concepts like allele frequency calculations and protein structures during the final weeks of preparation.