Page 2 - Assignment-Questions-Mineral Nutrition

8. Deficiency of _________ causes the leaves to develop a dark green colouration.
1. Phosphorous
2. Potassium
3. Sodium
4. None of the above
9. Deficiency of ________ causes chlorosis in older leaves
1. Calcium
2. Magnesium
3. Sodium
4. Nitrogen
10. A “wild type” organism that does not need any additional growth supplement is
known as
1. Phenotype
2. Auxotroph
3. Autotroph
4. Prototroph

B. Very Short Answer Questions (1 mark each)

1. Name one symbiotic nitrogen-fixing bacteria.
2. Give two examples of photosynthetic micro-organisms, which also fix atmospheric
nitrogen.
3. Name two organisms each which fix nitrogen asymbiotically and symbiotically.
4. Name the substance that imparts pink colour to the root nodule of a leguminous plant and
also mention its role.
5. What is the term used for mineral deficiency symptom in plants in which leaves became
yellow in different pattern?

C. Short Answer Questions-II (2 marks each)

6. Differentiate between two types of absorption of minerals in plants from soil.
7. Name the following :
(a) Bacteria which converts ammonia into nitrite.
(b) Bacteria which oxidises nitrite into nitrate.
8. How does Leghemoglobin protect the enzyme nitrogenase ?

D. Short Answer Questions-I (3 marks each)

9. Write the deficiency symptoms of the following three elements :
(a) Phosphorus
(b) Magnesium
(c) Potassium
10. Describe the following three deficiency symptoms and co-relate them with concerned
mineral deficiency :
(a) Chlorosis
(b) Necrosis
(d) Stunted plant growth