MCQ
Bacterial role in carbon cycle is ………………
  • A
    photosynthesis
  • B
    chemosynthesis
  • C
    assimilation
  • breakdown of organic matter

Answer

Correct option: D.
breakdown of organic matter
breakdown of organic matter

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Match the following list of bacteria and their commercially important products :
 
Bacterium
 
Product
$i.$
Aspergillus niger
$a.$
Lactic acid
$ii.$
Acetobacter aceti
$b.$
Butyric acid
$iii.$
Clostridium butylicum
$c.$
Acetic acid
$iv.$
Lactobacillus
$d.$
Citric acid
Choose the correct match :
When a plant of $F1$​ generation is crossed with homozygous dominant parent, it is known as:
Mutation that results in Sickle-cell anaemia is a ………………..
Tobacco consumption is known to stimulate secretion of adrenaline and nor $-$ adrenaline. The component causing this could be :
Seminal plasma in human males is rich in:
There is no natural death in single celled organisms like Amoeba and bacteria because:
The pro $-$ ubisch bodies are converted to ubisch bodies when they become coated by $..............$
If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?
Read the following and answer any four questions from $(i)$ to $(v)$ given below:
Crown gall is a neoplastic disease of most dicotyledonous plants and is caused by the soil bacterium Agrobacterium tumefaciens. A large extra chromosomal plasmid in these bacteria was found to be responsible for this disease. The plasmid is known as $Ti$ plasmid. Bacteria free crown gall cells can be cultured in the absence of phytohormones. $Ti$ plasmid is widely used in genetic engineering to deliver the desirable genes. The part of Ti plasmid transferred into plant cell $\text{DNA}$ is called $T-\text{DNA}. T-\text{DNA}$ with desired $\text{DNA}$ segment is inserted into the chromosome of the host plant where it produces copies of itself.
  1. Which of the following is the full full of $T- \text{DNA}$?
  1. Transfer $\text{DNA}$.
  2. Tumour inducing $\text{DNA}$.
  3. Transgenic $\text{DNA}$.
  4. None of these.
  1. Ti plasmid cannot infect and develop crown gall in,
  1. Tomato.
  2. Maize.
  3. Soybean.
  4. sunflower.
  1. While making transgenic plant, $T- \text{DNA}$ is inserted into the host cell, it is then:
  1. Integrated into the target host genome.
  2. Lie independent of the host genome.
  3. Rupture the host cell wall.
  4. Produce oncogenic factors in the host.
  1. Agrobacterium mediated gene transfer in plants:
  1. Allows relatively large segment of $\text{DNA}$.
  2. Transfer of $\text{DNA}$ with defined ends and minimal rearrangement.
  3. High quality and fertility in transgenic plants.
  4. All of these.
  1. Assertion : In Agrobacterium mediated gene transfer in plants, transgenic plants do not develop tumors.
Reason : In $T- \text{DNA}$ tumor producing genes are deleted during the process of gene transfer.
  1. Both assertion and reason are true and reason is the correct explanation of assertion.
  2. Both assertion and reason are true but reason is not the correct explanation of assertion.
  3. Assertion is true but reason is false.
  4. Both assertion and reason are false.
Ovule is straight with funiculus, embryo sac, chalaza and micropyle lying on one straight line. It is