Tag: botany

Questions Related to botany

Among the plants listed, point out which one does not fit into ecological group represented by other plants 

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. Acacia

  2. Rhizophora / Vallisneria

  3. Euphorbia

  4. Aloe

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Correct Option: B
Explanation:

Acacia, Aloe, Euphorbia are xerophytes plants while Vallisneria is hydrophyte and Rhizophora belongs to the halophyte plant group.

Development of microsporangium in angiosperms and gymnosperms is of.

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. Eusporangiate type

  2. Leptosporangiate type

  3. Monosporic type

  4. Tetrasporic type

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Correct Option: A

In angiosperms normally after fertilization.

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. The zygote divides earlier than the primary endosperm nucleus

  2. The primary endosperm nucleus divides earlier than the zygote

  3. Both the zygote and primary endosperm nuclei divide simultaneously

  4. Both the zygote and primary endosperm nuclei undergo a resting period

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Correct Option: A

Which of the following Angiosperm families possess vessels in the wood?
a. Magnoliaceae
b. Degeneriaceae
c. Winteraceae
d. Annonaceae
Select the correct answer.

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. $1, 2$ and $3$

  2. $1, 3$ and $4$

  3. $1, 2$ and $4$

  4. $2$ and $4$

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Correct Option: A

Which one of the following statements is correct?

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. In the wood of dicots, ray tracheids are absent

  2. In the wood of gymnosperms, ray parenchyma is absent

  3. In most commercially important dicot woods, fibers are absent

  4. In the wood of all gymnosperms, vessels are absent

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Correct Option: A

Gnetum resembles angiosperms in showing which one of the following types of female gametophyte development?

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. Monophonic

  2. Bishopric

  3. Endymion

  4. Tetrasporic

Show answer
Correct Option: A

Christian Gram belongs to which country?

botany option b: biotechnology and bioinformatics gram staining microbiology: organisms in industry cell wall and cell membrane

  1. Italy

  2. Sweden

  3. Denmark

  4. Germany

Show answer
Correct Option: C
Explanation:

Hans Christian Joachim Gram was a Danish bacteriologist noted for his development of the Gram stain.

Peptidoglycan forms many layers in the wall of

botany option b: biotechnology and bioinformatics gram staining microbiology: organisms in industry cell wall and cell membrane

  1. Gram $(+)$ bacteria

  2. Gram $(-)$ bacteria

  3. Gram neutral bacteria

  4. All the above

Show answer
Correct Option: A
Explanation:

On the basis of composition of cell wall, the bacteria are classified into two groups, namely Gram positive and Gram negative bacteria. Cell wall of all bacteria is made up of peptidoglycan. The gram positive bacteria contains many layers of peptidoglycan. However, Gram negative bacteria contains single layer of peptidoglycan. Apart from this, it also contains an outer layer of lipopolysaccharide (LPS). 

Thus, the correct answer is 'Gram (+) bacteria.'

Arrange the following steps in a correct sequence as per Gram's staining technique:
Treatment with 0.5% iodine solution (1), washing with water. (2) treatment with absolute alcohol/acetone (3), staining with weak alkaline solution of crystal violet (4)

botany option b: biotechnology and bioinformatics gram staining microbiology: organisms in industry cell wall and cell membrane

  1. 4 $\rightarrow$1 $\rightarrow$2 $\rightarrow$3

  2. 3 $\rightarrow$2 $\rightarrow$1 $\rightarrow$4

  3. 3 $\rightarrow$1 $\rightarrow$2 $\rightarrow$4

  4. 4 $\rightarrow$2 $\rightarrow$3 $\rightarrow$1

Show answer
Correct Option: A
Explanation:

Bacteria can be classified into two groups based upon reaction bacteria to Gram's stain (Christian Gram, 1884. Bacteria are first stained with weakly alkaline solution of crystal violet and then treated with 0.5% iodine solution. This is followed by washing with water and then with alcohol or acetone. Bacteria which retain blue or purple colour are known as Gram (+) bacteria (e.g Bacillus subtilis). Bacteria which do not retain stain and become colourless are called Gram (-) bacteria (e.g. Escherichia coli). Washing of the stain in Gram (- ve) bacteria is due to high lipid content of their cell wall which gets dissolved in organic solvents like acetone. So, the correct answer is '4 →1 →2 →3'.

Which of the given statements are correct?
(i) Bacillus subtilis is a Gram(+) bacteria
(ii) Escherichia coli is a Gram (-) bacteria
(iii) Washing of the Gram's stain in Gram (-) bacteria is due to high lipid content of the cell wall, which gets dissolved in organic solvents like acetone

botany option b: biotechnology and bioinformatics gram staining microbiology: organisms in industry cell wall and cell membrane

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (i) and (iii)

  4. (i), (ii) and (iii)

Show answer
Correct Option: D
Explanation:

Bacteria can be classified into two groups based upon reaction bacteria to Gram's stain (Christian Gram, 1884. Bacteria are first stained with weakly alkaline solution of crystal violet and then treated with 0.5% iodine solution. This is followed by washing with water and then with alcohol or acetone. Bacteria which retain blue or purple colour are known as Gram (+) bacteria (e.g Bacillus subtilis). Bacteria which do not retain stain and become colourless are called Gram (-) bacteria (e.g. Escherichia coli). Washing of the stain in Gram (- ve) bacteria is due to high lipid content of their cell wall which gets dissolved in organic solvents like acetone. So, the correct answer is '(i), (ii) and (iii)'.