Which of the following statements is correct?

1. Organisms that depend on living plants are called saprophytes.

2. Some of the organisms can fix atmospheric nitrogen in specialized cells called sheath cells. 

3. The fusion of two cells is called Karyogamy.

4. Fusion of protoplasms between two motile or non-motile gametes is called plasmogamy.

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 is incorrect about Cyanobacteria?

1. They are photoautotrophs

2. They lack heterocysts

3. They often form blooms in polluted water bodies

4. They have chlorophyll A similar to green plants

Which of the following statements is incorrect?

1. Yeasts have filamentous bodies with long thread-like hyphae

2. Morels and truffles are edible delicacies

3. Claviceps is a source of many alkaloids and LSD

4. Conidia are produced exogenously and ascopores endogenously

Match the Column-I with Column-II

Choose the correct answer from the options given below:

     (a)   (b)   (c)   (d)

1.   (ii)  (iii)   (iv)   (i)

2.   (i)    (ii)   (iii)   (iv)

3.   (iii)   (ii)   (i)   (iv)

4.   (ii)    (i)   (iii)   (iv)    

Which of the following statements is incorrect?

1. Prions consist of abnormally folded proteins

2. Viroids lack a protein cost

3. Viruses are obligate parasites

4. Infective consituent in viruses is the protein coat

Mad cow disease in cattle is caused by an organism which has :

1. Inert crystalline

2. Abnormally folded protein

3. Free RNA without protein coat

4. Free DNA without protein coat

Which of the following statements is correct?

1. Lichens do not grow in polluted areas.

2. Algal component of lichens is called mycobiont

3. Fungal component of lichens is called phycobiont

4. Lichens are not good pollution indicators.

Match the organisms in column I with habitats in column II.

      Column I                              Column II

(a) Halophiles                        (i) Hot springs

(b) Thermoacidophiles            (ii) Aquatic environment

(c) Methanogens                    (iii) Guts of ruminants

(d) Cyanobacteria                  (iv) Salty areas

Select the correct answer from the options given below:

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

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

3. (a)-(iii), (b)-(iv), (c)-(i), (d)-(i)

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