Rhizobium

Q. Rhizobium can be found in the root nodules of which of the following plants?

1. Carrot
2. Soybean
3. Pea
4. Sweet potato

Q. Which one of the following shows symbiotic relationship with bean plants?

1. Lactobacillus
2. Saccharomyces
3. Clostridium
4. Rhizobium

Q.

Bacteria such as ____ can fix atmospheric nitrogen and convert it into usable nitrogenous compounds.

Q.

The process in which organic nitrogen is converted into ammonia is called _________.

1. assimilation

2. nitrification

3. nitrogen fixation

4. nitrogenization

Q.

A hypha-bearing sporangium is called ________.

Q. Which of the following statements hold true for Rhizobium?

1. They are rod-shaped.
2. They are round shaped.
3. They are nitrogen fixers.
4. They reside on roots of leguminous plants.

Q. Farmers coat the seeds of cereals with rhizobial solution. Why is this done?

1. Rhizobium provides nitrogen to the plantlets.
2. Rhizobium kills harmful microbes.
3. Rhizobium helps in seed germination.
4. Rhizobium provides oxygen to the seeds.

Q.

A substance used as a condiment is a symbiotic relationship between two organisms. Identify the organisms involved from the following.

1. Antarctica is a very boring place and microbes do not like visiting Antarctica

2. Extreme low temperatures of Antarctica does not support microbial growth

3. The salt-rich air in Antarctica is toxic to microbes
4. Faecal matter of migratory birds has antimicrobial property

Q. Aashish took a thin root-section of fenugreek plant and observed it under the microscope after staining. He observed rod-shaped organisms in it. Which of the following microbe did he identify?

1. Lactobacillus
2. Yeast
3. Clostridium
4. Rhizobium

Q. The process of coating seeds of non-leguminous plants with powder or solution of nitrogen fixing bacteria is known as ____.

1. nitrogen fixation
2. bio-remediation
3. rhizobial innoculation
4. coagulation

Q.

Mycorrhiza is a ________ .

1. virus

2. cyanobacteria

3. bacteria

4. fungi

Q.

Rhizobium bacteria help in nitrogen fixation, but they cannot make their own food.

1. True

2. False

Q.

What are the steps involved in formation of a root nodule?