Biological Classification quiz

The five-kingdom classification was proposed by:

Methanogens belong to:

Red tides are caused by:

Malaria is caused by:

The fungus that causes rust disease in wheat is:

Which of these has no cell wall?

Tobacco mosaic virus was first discovered by:

Aseptate, coenocytic mycelium is a feature of:

Mad cow disease is caused by:

Which organism has a protein-rich layer called the pellicle?

Why are archaebacteria able to survive in harsh habitats? (2 marks)

What are chemosynthetic autotrophic bacteria? Give their importance. (2 marks)

Why are euglenoids considered a link between plants and animals? (2 marks)

What are the main features of slime moulds? (2 marks)

Distinguish between ascospores and basidiospores. (2 marks)

What is mycorrhiza? (2 marks)

Name two economically important ascomycetes and their uses. (2 marks)

How do bacteriophages differ from plant viruses in their genetic material? (2 marks)

What did Beijerinck mean by 'contagium vivum fluidum'? (2 marks)

Why are lichens good indicators of pollution? (2 marks)

E. coli divides every 20 minutes. How many generations occur in 2 hours, and how many cells form from 10 cells? (3 marks)

A yeast culture doubles every 90 minutes. Starting with 1,000 cells, calculate the number after 6 hours. (3 marks)

A virus particle (TMV) is about 300 nm long and a bacterium about 3 micrometres long. How many times longer is the bacterium? (1 micrometre = 1,000 nm) (3 marks)

A lake has 1,200 diatoms per mL. Calculate the number in 5 litres of water. (3 marks)

In a sample of 50 fungi, 10 were Phycomycetes, 20 Ascomycetes, 15 Basidiomycetes and 5 Deuteromycetes. Calculate the percentage of each and the ratio of Ascomycetes to Basidiomycetes. (3 marks)

Read the passage and answer the questions. In 1892, Dmitri Ivanowsky recognised certain microbes as causal organisms of the mosaic disease of tobacco. These were found to be smaller than bacteria because they passed through bacteria-proof filters. M.W. Beijerinck in 1898 demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants. W.M. Stanley in 1935 showed that viruses could be crystallised. (i) What are viruses made of? (ii) What did Stanley show? (iii) Why are viruses called obligate parasites? (5 marks)

Read the passage and answer the questions. Archaebacteria are special since they live in some of the most harsh habitats such as extreme salty areas (halophiles), hot springs (thermoacidophiles) and marshy areas (methanogens). They differ from other bacteria in having a different cell wall structure. Methanogens are present in the gut of several ruminant animals such as cows and buffaloes. (i) Name the three types of archaebacteria. (ii) What is the role of methanogens in the production of biogas? (iii) What feature helps them survive harsh habitats? (5 marks)

Read the passage and answer the questions. Protozoans are heterotrophs and live as predators or parasites. They are believed to be primitive relatives of animals. Amoeboid protozoans capture prey using pseudopodia. Flagellated protozoans are free-living or parasitic. Ciliated protozoans have thousands of cilia, and sporozoans have an infectious spore-like stage. (i) Name one disease caused by a flagellated protozoan. (ii) How does Paramoecium take in food? (iii) Name the sporozoan that causes malaria. (5 marks)

Read the passage and answer the questions. Fungi are a kingdom of heterotrophic organisms. They show great diversity in morphology and habitat. You must have seen fungi on a moist bread and rotten fruits. The common mushroom and toadstools are also fungi. White spots seen on mustard leaves are due to a parasitic fungus. (i) Name the fungus that causes white spots on mustard. (ii) How do fungi obtain their food? (iii) Name two useful fungi. (5 marks)

Read the passage and answer the questions. Lichens are symbiotic associations, that is, mutually useful associations, between algae and fungi. The algal component is known as phycobiont and the fungal component as mycobiont. Algae prepare food for fungi, and fungi provide shelter and absorb mineral nutrients and water for their partner. (i) What is the phycobiont? (ii) How do the two partners help each other? (iii) Why do lichens not grow in polluted areas? (5 marks)

Explain the five-kingdom classification with the criteria used. Draw a chart comparing the characteristics of the five kingdoms. (6 marks)

Describe the features of kingdom Monera. Explain the different types of bacteria by shape and nutrition, with examples and diagrams. (6 marks)

Describe the main groups of kingdom Protista with examples and diagrams. (6 marks)

Describe the classification of kingdom Fungi into four classes with examples. Give the economic importance of fungi. (6 marks)

Describe the structure of viruses with labelled diagrams. Explain viroids, prions and lichens. (6 marks)