Rhizobium and Frankia

(1) Free living in soil

(2) Act as symbiont and fix nitrogen

(3) One is found on the roots of non-leguminous plants

(4) All of these

The central portion of nodule is pink in color due to

These are the events of Nodule formation:
a. Rhizobia get attached to epidermal and root hair.
b. Rhizobia multiply and colonise the surroundings of roots
c. Bacteria invade the root hair
d. The root hairs curl
e. An infection thread is produced
f. Bacteria are released from the thread into the cells
g. Infection thread carries the bacteria into the cortex of the root
h. The release of bacteria into cortex leads to the differentiation of specialised nitrogen fixing cells
i. Establishment of a direct vascular connection with the host for exchange
j. Nodule is formed finally
k. Initiation of nodule formation in the cortex of the root
Arrange them in order.
1. b-a-d-c-e-g-f-k-i-h-j
2. b-a-c-d-g-e-f-k-h-j-i
3. b-a-d-c-e-g-k-f-h-j-i
4. a-b-c-d-e-g-k-f-j-i-h

Which of the following does not happen during nodule formation?

Nodule formation is a result of

To produce two molecules of ammonia, how many ATP are hydrolysed?

Enzyme Nitrogenase is:

To protect nitrogenase from oxygen, which of the following in nodule will act as scavenger

The nitrogen fixing bacteria are

The energy required, for the process of nitrogen metabolism comes from