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Past Questions and Answers

NABTEB Agricultural Science Past Questions And Answers (Objective and Theory)

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NABTEB Agricultural Science Past Questions And Answers (Objective and Theory)


Section A: Multiple Choice Questions


Question: Which of the following is a benefit of no-till farming?


A) Enhanced soil aeration

B) Increased soil erosion

C) Improved water infiltration

D) Faster weed growth

Answer: C) Improved water infiltration

Question: What is the primary purpose of the process of vernalization in certain crops?


A) Pest control

B) Flowering induction

C) Soil fertility improvement

D) Weed suppression

Answer: B) Flowering induction

Question: Which nutrient deficiency in plants is often indicated by yellowing of leaves, especially between veins?


A) Nitrogen

B) Iron

C) Phosphorus

D) Potassium

Answer: B) Iron

Question: What is the main advantage of hydroponic farming?


A) Reduced water usage

B) Enhanced nutrient absorption

C) Lower equipment costs

D) Minimal environmental impact

Answer: B) Enhanced nutrient absorption

Question: Which of the following is a method of soil conservation involving plowing across the contour lines of a slope?


A) Contour plowing

B) Terracing

C) Strip cropping

D) Crop rotation

Answer: A) Contour plowing

Question: What is the primary purpose of the use of drip lines in irrigation systems?


A) Weed suppression

B) Nutrient absorption

C) Water conservation

D) Pest control

Answer: C) Water conservation

Question: Which greenhouse gas is released from organic matter in flooded rice fields?


A) Carbon dioxide (CO2)

B) Methane (CH4)

C) Nitrous oxide (N2O)

D) Ozone (O3)

Answer: B) Methane (CH4)

Question: What is the primary purpose of a wind turbine in an agricultural setting?


A) Soil aeration

B) Energy generation

C) Pest control

D) Temperature regulation

Answer: B) Energy generation

Question: Which of the following is an example of a cover crop that helps fix nitrogen in the soil?


A) Mustard

B) Sunflower

C) Clover

D) Radish

Answer: C) Clover

Question: In organic farming, what is the alternative to synthetic herbicides for weed management?


A) Crop rotation

B) Mulching

C) Inorganic fertilizers

D) Chemical pesticides

Answer: B) Mulching


Section B: Theory Questions


Question: Discuss the impact of monoculture on agricultural ecosystems and suggest strategies to mitigate its negative effects.

Answer: Monoculture can lead to increased susceptibility to pests and diseases and soil nutrient depletion. Mitigation strategies include crop diversification, agroforestry, and integrated pest management.


Question: Explain the concept of agroecology and how it differs from conventional agricultural practices.

Answer: Agroecology integrates ecological principles into agriculture, emphasizing sustainable and holistic approaches. It differs from conventional practices by promoting biodiversity, reducing chemical inputs, and enhancing resilience to environmental changes.


Question: Elaborate on the role of precision farming technologies in optimizing resource use and improving crop yield.

Answer: Precision farming involves using technologies like GPS, sensors, and data analysis to optimize resource use, enhance efficiency, and improve overall crop yield. It allows for targeted applications of water, fertilizers, and pesticides.


Question: Discuss the concept of food security and the challenges faced in achieving it globally.

Answer: Food security involves ensuring all people have access to sufficient, safe, and nutritious food. Challenges include population growth, climate change, and unequal distribution of resources, requiring global cooperation and sustainable agricultural practices.


Question: Explain the principles of sustainable pest management and provide examples of biological control methods.

Answer: Sustainable pest management involves minimizing the use of chemical pesticides and utilizing biological control methods such as introducing natural predators, releasing sterile insects, and implementing cultural practices to control pest populations.

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