Microbes in Agriculture

Q.

Anthropogenic actions have caused the evolution of species. Explain with the help of two examples.

Q.

The bacterium Bacillus thuringiensis is widely used in contemporary biology as

1. indicator of water pollution

2. source of industrial enzyme

3. agent of production of dairy products

4. insecticide

Q. X is a bacterium that lives symbiotically in the root nodules of pea plants. Identify X.

1. Rhizopus
2. Lactobacillus
3. Chlamydomonas
4. Rhizobium

Q. Which of the following is NOT correct about Bacillus thuringiensis?

1. It can be sprayed on plants.
2. It can kill insects.
3. It can kill harmful bacteria.
4. It's toxin has been genetically engineered.

Q. Rhizobium is a nitrogen fixing bacteria present in soil.

1. True
2. False

Q. Drawback(s) of using chemical pesticide and insecticide include:

1. High cost
2. It is specific
3. It is non specific
4. Causes pollution

Q. Which plant should be grown by farmer after harvesting wheat crop?

1. Maize
2. Paddy

Q. X is a bacterium that lives symbiotically in the root nodules of pea plants. Identify X.

1. Rhizopus
2. Chlamydomonas
3. Rhizobium
4. Lactobacillus

Q. Which of the following statement/s hold true in case of Rhizobium?

1. They live in the root nodules of leguminous crops.
2. They help in the process of nitrogen fixation.
3. They can reduce the dependency and expenses on fertilisers.
4. They are oval cells and reproduce by budding.

Q. Which of the following is NOT a leguminous plant?

1. Pea
2. Horse gram
3. Green gram
4. Rice

Q. Nitrogen is returned back to the atmosphere in the nitrogen cycle by the process of________.

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

Q.

what happend in bacillus thuringiensis process?

Q. Probiotics are harmful bacteria that cause diseases.

1. True
2. False

Q. Bt brinjal variety is developed by using the gene isolated from _________________.

1. Escherichia coli
2. Lactobacillus acidophilus
3. Bacillus thuringiensis
4. Vibrio cholerae

Q. X is a bacteria that lives symbiotically in the roots of pea plants. Identify X.

1. Clostridium
2. Rhizopus
3. Rhizobium
4. Nitrosomonas

Q. A nitrogen-fixing microbe associated with Azolla in rice field is

1. Anabaena
2. Frankia
3. Tolypothrix
4. Spirulina

Q. Regaring the assertion and reason, select the right option.

Assertion: Use of biofertilizers greatly enhances crop productivity.
Reason: Irrigation is very important in increasing crop productivity.

1. Both the assertion and reason are true and the reason is the correct explanation for the assertion.
2. The assertion is true, but the reason is false
3. Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
4. Both the assertion and reason are false.

Q. The use of biological methods for controlling plant diseases and pests is known as .

1. insecticide
2. pesticide
3. herbicide
4. biocontrol

Q.

Identify the advantage(s) of microbial biofertilisers.

1. Increase in nitrogen content of the soil.

2. It is eco-friendly.

3. Reduces the soil fertility.

4. Leads to health issues in animals.

Q. Biocontrol refers to the biological control of

1. Crop quality
2. Pests
3. Weeds
4. Yield