Tag: bacteria; benefits and harmful effects

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Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Many bacteria bear minute hairy structures on their cell wall which are involved in genetic transfer are called as

  1. Hairs

  2. Flagella

  3. Pili

  4. Cilia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pili are minute hair like appendages, that emerges from suface of Gram -ve bacteria. They have similar structure as flagella and often involved in attachment to surface and making of biofilm. They also help in DNA exchange. They are involved in conjugation which results in transfer or exchange of genetic material. 

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Escherichia colt has the following combination of characters.

  1. Rod shaped, 1-3$\mu $m long, gram negative
  2. Rod shaped, 1- 3$\mu $m long, gram positive
  3. Spiral, 1-3$\mu $m long, gram negative
  4. Spiral, 1-3$\mu $m long, gram positive
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Escherichia coli is a rod-shaped, gram-negative bacterium that is typically 1-3 micrometers in length.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Binary fission in Amoeba involves ____________.

  1. Amitosis

  2. Mitosis

  3. Meiosis

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The reproduction in amoeba is asexual, called binary fission, where it replicated its cells by mitosis and its cell divide in two equal daughter cells. Amitosis is similar to binary fission. Meiosis does not take place in amoeba.

The correct answer is B. 

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Torula condition' occurs in ________.

  1. Rhizopus

  2. Ulothrix

  3. Spirogyra

  4. Riccia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
When some species of like mucor they grow in high concentrated liquid medium of sugar and they brown up into small pieces called odia and further they grow like yeast by budding and this condition called Torula condition.
Hence the correct answer is A. 
Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Amoeba takes food through ____________.

  1. Phagocytosis

  2. Pinocytosis

  3. Endocytosis

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Amoeba takes its food by the method of phagocytosis (i.e ingesting or engulfing the food particles), also by means of pinocytosis (wherein amoeba wraps around its membranes around the food forms vesicles and pinch it inside the membrane and then gradually digests it) and by endocytosis (in which the outermost the membrane of amoeba either stretches inwards or projects outwards to obtain nutrition.

The correct answer is D.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Histological differentiation is absent in ____________.

  1. Amoeba

  2. Hydra

  3. Cockroach

  4. Earthworm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Amoeba is a unicellular organism; therefore, it lacks the complex histological differentiation found in multicellular organisms like Hydra, cockroaches, or earthworms.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects

Which of the following is a photo-autotrophic bacterium

  1. Rhodospirillum

  2. Azospirillum

  3. NitrosomonasV

  4. Nitrobacter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rhodospirillum bacteria is facultative aerobic Photo - autotrophic bacteria use non-sulphur aliphatic organic  compound as donor of $H _{2}$  go,. Propyl alcohol .

$6CO _{2}+12CH _{3}CHOHCH _{3}\overset{Light}{\rightarrow}$

$C _{6}H _{12}O _{6}+12CH _{3}COH _{3}+6H _{2}O$



Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

In Amoeba, the cell division takes place ____

  1. Involving changes in the chromatin reticulum

  2. Without involving changes in the chromatin reticulum

  3. Leading to reduction in the number of chromosomes

  4. Without dividing the nucleus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Through the cell division process one cell splits into two identical cells. There can be two kind of cell divisions- Mitosis and Meiosis. Cell division mitosis takes place in Amoeba for replicating genetic material (chromatin network) into the daughter cells. It is a form of asexual reproduction in unicellular organisms like Amoeba. The process is known as binary fission.
So, the correct answer is 'Involving changes in the chromatin reticulum'
Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Some bacteria are considered plants as they

  1. Are green in colour

  2. Have rigid cell wall

  3. Have chlorophyll

  4. Have stomata
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Some bacteria, such as cyanobacteria, are photosynthetic and contain chlorophyll, which led to their historical classification as plants.

Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

In bacteria the site for respiratory activity is found in

  1. Episome

  2. Microsome

  3. Ribosome
  4. Cell membrane$/$ Mesosome
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In bacteria the site for respiratory activity is found in mesosomes. Mesosomes are folded invaginations in the cell membrane of bacteria. They increases the surface area required for respiration. They contain respiratory enzymes. It is the site of respiratory activity.

Thus, the correct answer is 'Cell membrane/ Mesosome.'