1. A nutrient is defined as any substance that:
Answer: B. supplies essential elements required for growth and metabolic functions
Biology Class 11 Unit 9: Diversity in Plant Functions MCQs
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2. Plant nutrients mainly consist of:
Answer: B. inorganic compounds
3. The number of elements found essential for plant growth is:
Answer: C. sixteen
4. The number of macronutrients is:
Answer: B. nine
5. Macronutrients are required in quantities greater than:
Answer: C. 0.05 percent of dry weight
6. The number of micronutrients is:
Answer: B. seven (as per the text list)
7. Which of the following is a macronutrient?
Answer: C. Phosphorus
8. Which of the following is a micronutrient?
Answer: C. Manganese
9. Which pair are both micronutrients?
Answer: B. Boron and zinc
10. Carbon and oxygen each constitute about what percentage of plant dry mass?
Answer: C. 45
11. Hydrogen constitutes about what percentage of plant dry mass?
Answer: B. 6
12. Nitrogen is a component of:
Answer: B. nucleic acids, proteins and chlorophyll
13. Plants take up nitrogen as:
Answer: B. nitrate and ammonium ions
14. Chlorosis at the tips of older leaves is the deficiency symptom of:
Answer: B. nitrogen
15. Potassium deficiency causes:
Answer: B. mottling of older leaves with drying of leaf edges and weak stems
16. Potassium functions in:
Answer: B. water balance, operation of stomata and as enzyme cofactor
17. Calcium is an important component of:
Answer: C. middle lamella and cell walls
18. Death of terminal buds and crinkling of young leaves is due to the deficiency of:
Answer: B. calcium
19. Magnesium is a component of:
Answer: C. chlorophyll
20. Interveinal chlorosis in older leaves is due to deficiency of:
Answer: C. magnesium
21. Phosphorus is a component of:
Answer: A. nucleic acids, phospholipids and ATP
22. Purpling of veins with poor flowering and fruiting indicates deficiency of:
Answer: C. phosphorus
23. Sulphur is a component of:
Answer: C. proteins
24. General chlorosis in young leaves is the sign of deficiency of:
Answer: B. sulphur
25. Iron is required in:
Answer: B. chlorophyll synthesis, respiration and nitrogen fixation
26. Interveinal chlorosis in young leaves in basic soils is due to deficiency of:
Answer: C. iron
27. Boron is required for:
Answer: B. cell wall function and pollen tube growth
28. Death of meristems and thick, leathery, discoloured leaves is caused by deficiency of:
Answer: C. boron
29. The most common micronutrient deficiency is of:
Answer: C. boron
30. Zinc deficiency causes:
Answer: B. reduced internode length and crinkled leaves
31. Molybdenum and nickel are involved in:
Answer: C. nitrogen metabolism
32. Manganese is required for:
Answer: B. water splitting step of photosynthesis and activation of enzymes
33. Chlorine is involved in:
Answer: C. photosynthesis (water splitting) and water balance
34. Copper is a component of:
Answer: B. many redox and lignin-biosynthetic enzymes
35. Death of a part of the plant body is called:
Answer: B. necrosis
36. Yellowing of the green parts of plants due to lack of chlorophyll is:
Answer: B. chlorosis
37. Stunted growth is due to deficiency of:
Answer: B. phosphorus, sulphur and potassium
38. Cultivating different crops alternately on the same soil is called:
Answer: B. crop rotation
39. Growing plants in nutrient solution without soil is called:
Answer: B. hydroponics
40. Carnivorous plants are:
Answer: B. photosynthetic autotrophs which trap insects
41. Carnivorous plants use insects as a supplementary source of:
Answer: B. nitrogen
42. Carnivorous plants usually grow in:
Answer: B. nitrogen-deficient habitats like marshes
43. Pitcher plant is:
Answer: B. Nepenthes
44. Venus flytrap is:
Answer: B. Dionaea muscipula
45. Sundew is:
Answer: C. Drosera
46. Gaseous exchange in plants occurs mainly by:
Answer: C. diffusion
47. Gas exchange in woody stems takes place through:
Answer: B. lenticels
48. In the daytime plants take in carbon dioxide because:
Answer: B. photosynthesis is faster than respiration
49. At dawn and dusk the net exchange of gases is zero. This is the:
Answer: B. compensation point
50. At night plants:
Answer: B. absorb oxygen and release carbon dioxide
About Biology Class 11 Unit 9 MCQs (Federal Board)
These 278 Biology MCQs cover Class 11 Unit 9: Diversity in Plant Functions of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 6 pages of 50. Use the Print button to save this chapter as a PDF.