Lec6

Question 1

is essential for the existence and survival of life. basic constituent of all organic compounds and is involved in the fixation of energy by photosynthesis

Answer 1

carbon cycle

Question 2

is maintained by the processes of photosynthesis, respiration, decomposition and fossil fuel burning.

Answer 2

C cycle

Question 3

Ascomycetes and Deuteromycetes

Answer 3

Cellulose decomposers

Question 4

decomposed by Bascideomycetes such as Aphyllophorales and Agaricales

Answer 4

Lignin decomposers

Question 5

are produced by various specious of Rhizopus, Aspergillus, Fusarium

Answer 5

Pectinase

Question 6

steps of nitrogen cycle

Answer 6

1. Nitrogen fixation
   2 . Nitrification
   3 .Assimilation
   4 . Ammonification
   5 .Denitrification

Question 7

atmospheric nitrogen is converted in to ammonia or organic compounds

Answer 7

Nitrogen fixation

Question 8

in this step ammonium ion initially oxidized in to nitrite
ions, subsequently in to nitrate ions

Answer 8

Nitrification

Question 9

in this step nitrites and nitrates produced in the whole nitrogen cycle are consumed by plants and animals

Answer 9

Assimilation

Question 10

organic nitrogen is converted in to ammonia

Answer 10

Ammonification

Question 11

in this step fixed forms of nitrogen is converted in to molecular nitrogen

Answer 11

Denitrification

Question 12

are only able to reduce NO3 to NO2

Answer 12

E.coli

Question 13

are only able to reduce NO3 to NO2

Answer 13

E.coli

Question 14

Are microorganisms that help plants to grow by increasing the quantity of nutrients

Answer 14

Biofertilizer

Question 15

provide natural growth hormone, protein, vitamins and minerals to the soil.

Answer 15

Aquatic cyanobacteria

Question 16

N2 fixing biofertilizer free living example

Answer 16

Azotobacter, Clostridium, Anabaena, nostoc

Question 17

Nitrogen fixation In aquatic habitat by ….

Answer 17

Nostoc and Anabaena

Question 18

A symbiotic generally mutualistic association between a fungus and the roots of a vascular plant.

Answer 18

Phosphate mobilizing Biofertilizer (Mycorrhiza)