Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

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

  1. Acacia

  2. Rhizophora / Vallisneria

  3. Euphorbia

  4. Aloe
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

Development of microsporangium in angiosperms and gymnosperms is of.

  1. Eusporangiate type

  2. Leptosporangiate type

  3. Monosporic type

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

In angiosperms and gymnosperms, the microsporangium develops from a group of archesporial cells, which is characteristic of the eusporangiate type of development.

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

In angiosperms normally after fertilization.

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In angiosperms, the primary endosperm nucleus (PEN) typically divides prior to the division of the zygote. This ensures that the nutritive endosperm tissue is established early to support the subsequent development of the embryo from the zygote.

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

Which one of the following statements is correct?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gymnosperm wood is generally composed of tracheids and lacks vessels. Ray tracheids are often found in gymnosperms but are absent in most dicot woods.

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

Peptidoglycan forms many layers in the wall of

  1. Gram $(+)$ bacteria
  2. Gram $(-)$ bacteria

  3. Gram neutral bacteria

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.'

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

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)

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (i) and (iii)

  4. (i), (ii) and (iii)
Reveal answer Fill a bubble to check yourself
D Correct answer
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)'.