Subject
BSC(ZBC)
, B.SC (ZOOLOGY, BOTANY, CHEMISTRY)
ASSIGNMENT
YEAR-3RD
BSC-ZBC-301 (BIOFERTILIZERS)
Q.1 What is Biofertilizer
Answer
Biofertilizers are substance that contains microbes, which helps in promoting the
growth of plants and trees by increasing the supply of essential nutrients to the
plants. It comprises living organisms which include mycorrhizal fungi, blue-green
algae, and bacteria. Mycorrhizal fungi preferentially withdraw minerals from organic
matter for the plant whereas cyanobacteria are characterized by the property of
nitrogen fixation.
Nitrogen fixation is defined as a process of converting di-nitrogen molecules into
ammonia. For instance, some bacteria convert nitrogen to ammonia. As a result,
nitrogen becomes available for plants.
Q.2 Write Importance of Biofertilizers
Answer
Biofertilizers are required to restore the fertility of the soil. Prolonged use of
chemical fertilizers degrades the soil and affects crop yield. Biofertilizers, on the
other hand, enhance the water holding capacity of the soil and add essential
nutrients such as nitrogen, vitamins and proteins to the soil. They are the natural
form of fertilizers and hence, widely used in agriculture.
Q.3 Name an important nitrogen-fixing bacteria
Answer
Examples of this type of nitrogen-fixing bacteria include species of Azotobacter,
Bacillus, Clostridium, and Klebsiella.
Beans: Rhizobium legumninosarum biovar ph...
Clover: Rhizobium leguminosarum biovar trifolii
Soybean: Bradyrhizobium japonicum, Bradyrhi...
Peas: Rhizobium leguminosarum biovar viceae
BSC(ZBC)
, B.SC (ZOOLOGY, BOTANY, CHEMISTRY)
ASSIGNMENT
YEAR-3RD
BSC-ZBC-301 (BIOFERTILIZERS)
Q.1 What is Biofertilizer
Answer
Biofertilizers are substance that contains microbes, which helps in promoting the
growth of plants and trees by increasing the supply of essential nutrients to the
plants. It comprises living organisms which include mycorrhizal fungi, blue-green
algae, and bacteria. Mycorrhizal fungi preferentially withdraw minerals from organic
matter for the plant whereas cyanobacteria are characterized by the property of
nitrogen fixation.
Nitrogen fixation is defined as a process of converting di-nitrogen molecules into
ammonia. For instance, some bacteria convert nitrogen to ammonia. As a result,
nitrogen becomes available for plants.
Q.2 Write Importance of Biofertilizers
Answer
Biofertilizers are required to restore the fertility of the soil. Prolonged use of
chemical fertilizers degrades the soil and affects crop yield. Biofertilizers, on the
other hand, enhance the water holding capacity of the soil and add essential
nutrients such as nitrogen, vitamins and proteins to the soil. They are the natural
form of fertilizers and hence, widely used in agriculture.
Q.3 Name an important nitrogen-fixing bacteria
Answer
Examples of this type of nitrogen-fixing bacteria include species of Azotobacter,
Bacillus, Clostridium, and Klebsiella.
Beans: Rhizobium legumninosarum biovar ph...
Clover: Rhizobium leguminosarum biovar trifolii
Soybean: Bradyrhizobium japonicum, Bradyrhi...
Peas: Rhizobium leguminosarum biovar viceae
