Class XI · Biology practice

Biological Classification MCQs

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300 questions in this collection · Page 5 of 30

Question 41 of 300

📘 CLASS XI

Biological Classification

Members of Kingdom Animalia store their food reserves primarily as:

Members of Kingdom Animalia are heterotrophic eukaryotes that store reserve food as glycogen or fat.

Question 42 of 300

📘 CLASS XI

Biological Classification

Who demonstrated that the extract of infected tobacco plants could cause infection in healthy plants and called the fluid Contagium vivum fluidum?

M.W. Beijerinck demonstrated the infectious nature of tobacco plant extracts and coined the term Contagium vivum fluidum.

Question 43 of 300

📘 CLASS XI

Biological Classification

Which scientist showed that viruses could be crystallised and that these crystals consist largely of proteins?

In 1935, W.M. Stanley crystallised viruses and showed that they consist largely of proteins.

Question 44 of 300

📘 CLASS XI

Biological Classification

Which of the following statements regarding the genetic material of viruses is correct?

Viruses possess either RNA or DNA as genetic material, but never both together.

Question 45 of 300

📘 CLASS XI

Biological Classification

Bacteriophages (viruses that infect bacteria) are usually:

Most bacteriophages contain double-stranded DNA.

Question 46 of 300

📘 CLASS XI

Biological Classification

Viroids differ from viruses because they:

Viroids are infectious free RNA molecules without a protein coat.

Question 47 of 300

📘 CLASS XI

Biological Classification

The RNA found in viroids is characterised by having:

Viroids consist of low molecular weight RNA.

Question 48 of 300

📘 CLASS XI

Biological Classification

Prions are infectious agents responsible for causing diseases like mad cow disease. They consist of:

Prions are infectious particles composed solely of abnormally folded proteins.

Question 49 of 300

📘 CLASS XI

Biological Classification

Bovine spongiform encephalopathy (BSE) in cattle has an analogous variant in humans known as:

Prions cause BSE in cattle and Creutzfeldt-Jakob disease (CJD) in humans.

Question 50 of 300

📘 CLASS XI

Biological Classification

Lichens are considered very good pollution indicators because:

Lichens are highly sensitive to air pollution and therefore are absent from polluted regions.

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