Biological Classification

Mad cow disease in cattle and Cr Jacob disease in humans are due to infection by .

1. Prion
2. Bacterium
3. Virus
4. Viroid

Which of the following statements is correct?

1. Some of the organisms can fix atmospheric nitrogen in specialized cells called sheath cells
2. Fusion of two cells is called Karyogamy
3. Fusion of protoplasm between two motile or non-motile gametes is called plasmogamy
4. Organisms that depend on living plants are called saprophytes

Which of the following is correct about viroids?

1. They have free RNA without protein coat
2. They have DNA with protein coat
3. They have free DNA without protein coat
4. They have RNA with protein coat

Which of the following statements is incorrect?

1. Infective constituent in viruses is the protein coat
2. Prions consist of abnormally folded proteins
3. Viroids lack a protein coat
4. Viruses are obligate parasites

Which of the following statement is incorrect?

1. Conidia are produced exogenously and ascospores endogenously.
2. Yeasts have filamentous bodies with long thread-like hyphae.
3. Morels and truffles are edible delicacies.
4. Claviceps is a source of many alkaloids and LSD.

Match Column-I with Column –II. Choose the correct answer from the options given below :

1. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
2. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
3. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
4. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

Which among the following is not a prokaryote?

1. Mycobacterium
2. Saccharomyces
3. Oscillatoria
4. Nostoc

Select the wrong statement.

1. Mushrooms belong to basidiomycetes.
2. Cell wall is present in members of fungi and plantae.
3. Pseudopodia are locomotory and feeding structures in sporozoans.
4. Mitochondria are the powerhouse of the cell in all kingdoms except monera.

After karyogamy followed by meiosis, spores are produced exogenously in

1. Saccharomyces
2. Neurospora
3. Alternaria
4. Agaricus

Which of the following organisms are known as chief producers in the oceans?

1. Euglenoids
2. Cyanobacteria
3. Dinoflagellates
4. Diatoms