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LEA Crop Science Reviewer: MCQs with Answer Key

ByAditya Abhishek

Hey students, preparing for your upcoming agriculture examinations such as PRC LEA, UPSC, ICAR JRF, etc. but confused about whether your preparation is going well or not? Well, no more! At Agriculture Review, we keep updating new test series daily based on previous years’ questions of the Examination for Agriculturists.

In this test, you have to attempt 50 questions from Crop Science subject. Attempting all questions is necessary to identify your strengths and weaknesses. After completing the test, you can take a screenshot of your result for future reference and compare it with past performances. To stay updated with regular test series, click on the bell icon at the bottom left corner of the screen.

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lea-crop-science-reviewer-mcqs-with-answer-key

LEA Crop Science Reviewer

1. Which enzyme catalyzes the primary CO₂ fixation (carboxylation) in the Calvin cycle of C₃ plants?

2. Which plant growth regulator is principally associated with promoting cell elongation and internode extension in stems?

3. The lateral meristem responsible for secondary thickening (secondary xylem and phloem) in dicot stems is the:

4. In photoperiodism, a short-day plant flowers when:

5. Which breeding method is primarily used to produce F₁ hybrids to exploit heterosis for yield improvement?

6. Which of the following is primarily a modification of the leaf for food storage?

7. In waterlogged soils the major factor that directly limits root function and crop growth is:

8. Which plant hormone is most directly involved in stomatal closure during drought stress?

9. Which of the following best describes ‘breeder seed’ in the seed certification system?

10. Which physiological index is commonly used to assess the water status of plant tissues and is calculated relative to fully turgid tissue?

11. Which tissue in a leaf primarily functions in photosynthesis and is characterized by densely packed chloroplast-rich cells?

12. Which of the following is a physiological mechanism by which plants tolerate salinity stress?

13. In self-pollinated crops, which breeding method is most commonly used to develop uniform cultivars?

14. Which anatomical feature is characteristic of C₄ plants and is associated with the Kranz anatomy?

15. Which adaptive trait would you most expect in upland rice ecotypes compared to lowland rice?

16. Which of the following is a major objective of seed certification?

17. Which physiological process describes translocation in plants?

18. Which of the following floral features typically promotes cross-pollination (outcrossing)?

19. In drought-prone environments, which cropping practice helps conserve soil moisture and reduce evaporative losses?

20. Which of the following is a typical symptom of potassium deficiency in many crops?

21. Which of the following best explains the function of bundle sheath cells in C₄ plants?

22. In a typical dicot leaf, the stomata are mainly located on which surface?

23. The physiological process by which plants lose water vapor mainly through stomata is known as:

24. In plant breeding, the process of transferring a specific desirable gene from one variety to another while retaining all other characteristics is known as:

25. In plants, the upward movement of water through xylem vessels is mainly due to:

26. Which of the following best characterizes vernalization?

27. Which of the following tissues is non-living at maturity and provides mechanical strength in plants?

28. In the seed certification process, which class of seed is produced from registered seed and intended for commercial distribution to farmers?

29. Which of the following is the principal photosynthetic pigment that captures light energy during photosynthesis?

30. Which statement best explains the phenomenon of apical dominance in plants?

31. The observable characteristics or traits of an organism resulting from the interaction of its genotype with the environment are referred to as:

32. In Mendelian inheritance, the law stating that alleles for different traits segregate independently during gamete formation is known as:

33. A crop that primarily reproduces through self-pollination and maintains genetic uniformity is termed as:

34. The breeding method that involves transferring one or a few desirable genes from a donor to a well-adapted variety through repeated crossing is called:

35. Which type of genetic variation arises due to changes in chromosome number or structure?

36. In plant breeding, heterosis or hybrid vigor is best described as:

37. The first generation obtained after crossing two genetically distinct parental lines is called:

38. In the Philippine seed system, the seed class that is directly multiplied from breeder seed under strict supervision is known as:

39. Which plant breeding technique is most suitable for inducing useful genetic variability in a self-pollinated crop?

40. In the context of plant variety protection, the breeder’s right to control the production and sale of a new variety is governed under which law in the Philippines?

41. The genetic purity of breeder seed should be maintained at a minimum of:

42. Which of the following denotes the correct sequence of seed multiplication in the formal seed system?

43. The seed certification tag color used for certified seeds in the Philippines is:

44. The process by which new varieties are tested in different locations to evaluate their adaptability and performance before release is called:

45. Which of the following is NOT a basic principle of seed technology?

46. The minimum germination percentage standard for certified rice seed in the Philippines is:

47. Seed viability can be best maintained by storing seeds under which condition?

48. In mutation breeding, which physical mutagen is most commonly used for inducing useful mutations in crop plants?

49. Which of the following government agencies in the Philippines is primarily responsible for seed certification and quality control?

50. The National Seed Industry Council (NSIC) in the Philippines is tasked with which of the following responsibilities?

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To learn N-P-K Computations, try checking out our tool: NPK Calculator

Aditya Abhishek has completed Bachelor Of Science in Agriculture from SDSUV, Uttarakhand. He focuses on learning and delivering knowledge on Agriculture and Home Gardening. He created Agriculture Review as a common platform for all nature enthusiast to learn better practices of agriculture, gardening & shop quality products & services.

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