Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Mineral Nutrition — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
Which gases/elements come from air and water, not the soil?
- A.Nitrogen, phosphorus, potassium
- B.Carbon, hydrogen, oxygen
- C.Iron, zinc, copper
- D.Calcium, magnesium, sulphur
2.
An essential element is one that:
- A.Can be replaced by another element
- B.Is needed to complete the life cycle and has a specific role
- C.Is never used in metabolism
- D.Is only decorative
3.
Nutrients needed in large amounts are:
- A.Micronutrients
- B.Macronutrients
- C.Vitamins
- D.Trace elements
4.
Which of these is a micronutrient?
- A.Nitrogen
- B.Potassium
- C.Zinc
- D.Calcium
5.
The soil-less culture method used to identify essential elements is:
- A.Hydroponics
- B.Grafting
- C.Layering
- D.Budding
6.
Nitrogen is a component of all the following EXCEPT:
- A.Proteins
- B.Nucleic acids
- C.Chlorophyll
- D.Cellulose
7.
The central atom of the chlorophyll molecule is:
- A.Iron
- B.Magnesium
- C.Calcium
- D.Zinc
8.
General yellowing of leaves due to lack of chlorophyll is:
- A.Necrosis
- B.Chlorosis
- C.Etiolation
- D.Wilting
9.
Deficiency symptoms of mobile elements (N, P, K) appear first in:
- A.Older leaves
- B.Younger leaves
- C.Roots only
- D.Flowers only
10.
Calcium is mainly needed for the:
- A.Cell wall and cell division
- B.Chlorophyll molecule
- C.Stomatal opening
- D.Triple bond of N₂
11.
Plants cannot use atmospheric N₂ directly because it is:
- A.Too rare
- B.Very unreactive (strong triple bond)
- C.Poisonous
- D.A solid
12.
The enzyme that carries out biological nitrogen fixation is:
- A.Amylase
- B.Nitrogenase
- C.Pepsin
- D.Catalase
13.
Rhizobium fixes nitrogen in the root nodules of:
- A.Cereals
- B.Legumes
- C.Grasses
- D.Conifers
14.
Which is a free-living nitrogen fixer?
- A.Rhizobium
- B.Azotobacter
- C.Amoeba
- D.Yeast
15.
Growing legumes to enrich soil nitrogen is the basis of:
- A.Crop rotation
- B.Hydroponics
- C.Transpiration
- D.Pruning
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
A plant grown in a complete nutrient solution but with nitrogen removed shows yellow, stunted growth. This shows nitrogen is:
- A.Essential and irreplaceable
- B.Not needed
- C.A micronutrient
- D.Only decorative
17.
Deficiency of an immobile element such as calcium shows first in young leaves because the element:
- A.Cannot be moved from old leaves to new growth
- B.Is moved to old leaves
- C.Is not needed by young leaves
- D.Evaporates
18.
A farmer alternates a wheat crop with a bean (legume) crop. The main benefit is that the legume:
- A.Replenishes soil nitrogen via Rhizobium
- B.Removes all minerals
- C.Stops photosynthesis
- D.Acidifies the soil permanently
19.
Although needed in tiny amounts, a micronutrient like molybdenum is still essential because:
- A.Its absence still prevents normal growth/completion of the life cycle
- B.It is a macronutrient
- C.It replaces nitrogen
- D.It is not used at all
20.
Both iron and magnesium deficiencies cause chlorosis, yet they differ because magnesium is part of chlorophyll while iron is needed to:
- A.Synthesise chlorophyll (it is not part of it)
- B.Form the cell wall
- C.Open stomata
- D.Fix nitrogen
21.
In a Rhizobium–legume association, the plant benefits from fixed nitrogen and the bacterium benefits from food and shelter. This relationship is:
- A.Symbiosis (mutualism)
- B.Parasitism
- C.Competition
- D.Predation
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Carbon, hydrogen, oxygen
- (B) Is needed to complete the life cycle and has a specific role
- (B) Macronutrients
- (C) Zinc
- (A) Hydroponics
- (D) Cellulose
- (B) Magnesium
- (B) Chlorosis
- (A) Older leaves
- (A) Cell wall and cell division
- (B) Very unreactive (strong triple bond)
- (B) Nitrogenase
- (B) Legumes
- (B) Azotobacter
- (A) Crop rotation
Section B — Challenge / Olympiad (2 marks each)
- (A) Essential and irreplaceable
- (A) Cannot be moved from old leaves to new growth
- (A) Replenishes soil nitrogen via Rhizobium
- (A) Its absence still prevents normal growth/completion of the life cycle
- (A) Synthesise chlorophyll (it is not part of it)
- (A) Symbiosis (mutualism)
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