Tag: botany

Questions Related to botany

Escherichia colt has the following combination of characters.

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

  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

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Correct Option: A

Binary fission in Amoeba involves ____________.

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

  1. Amitosis

  2. Mitosis

  3. Meiosis

  4. None of these

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Correct Option: B
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. 

Torula condition' occurs in ________.

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

  1. Rhizopus

  2. Ulothrix

  3. Spirogyra

  4. Riccia

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Correct Option: A
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. 

Amoeba takes food through ____________.

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

  1. Phagocytosis

  2. Pinocytosis

  3. Endocytosis

  4. All the above

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Correct Option: D
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.

Histological differentiation is absent in ____________.

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

  1. Amoeba

  2. Hydra

  3. Cockroach

  4. Earthworm

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Correct Option: A

Which of the following is a photo-autotrophic bacterium

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

  1. Rhodospirillum

  2. Azospirillum

  3. NitrosomonasV

  4. Nitrobacter

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Correct Option: A
Explanation:

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

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

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



In Amoeba, the cell division takes place ____

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

  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

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Correct Option: A
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'

Some bacteria are considered plants as they

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

  1. Are green in colour

  2. Have rigid cell wall

  3. Have chlorophyll

  4. Have stomata

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Correct Option: C

In bacteria the site for respiratory activity is found in

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

  1. Episome

  2. Microsome

  3. Ribosome

  4. Cell membrane$/$ Mesosome

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Correct Option: D
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.'

Sex factor of bacteria is

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

  1. RNA

  2. Sex pili

  3. F-factor

  4. Chromosome replicon

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Correct Option: C
Explanation:

F-factor is also called as fertility factor. It is the sex factor of bacteria. It allows the transfers of genes from one bacterium carrying the factor to another bacterium lacking the factor by the process of conjugation. It is found in some bacteria only.

Thus, the correct answer is 'F-factor.'