91.

Mycorrhiza is correctly described as

• symbiosis of algae and fungi

• relation of ants with the stem of some trees

• parasitic association between roots and some fungi

• symbiotic relationship between fungi and roots of some higher plants

What are the sex organs provided in some bacteria?

• Circular DNA

• Gametes

• Sex pili

• Plasmid

Identify the accurate explanation of mesosome. It is

• a specialised structure of prokaryotic cell formed by extension of plasma membrane into the cytoplasm

• the middle layer of the prokaryotic cell wall

• the organelle of eukaryotic cell which helps in lipid synthesis

• the middle layer of eukaryotic cell wall.

Yeast is not included in protozoans but in fungi because

• it has chlorophyll

• it shows saprotrophic mode of nutrition

• it has eukaryotic organisation

• cell wall is made up of cellulose and reserve food material as starch

Identify the labelled part in the given figure and select the correct option.

• A - Heterocyst, B - Mucilaginous sheath

• A - Mucilaginous sheath, B - Heterocyst

• A - Heterocyst, B - Capsid

• A - Pseudopodia, B - Mucilaginous sheath

Which of the following microbes is correctly paired with its function?

• Aspergillus niger- Production of lactic acid

• Trichoderma polysporum- Lowers blood cholesterol

• Saccharomyces cerevisiae- Production of citric acid

• Methanogenic bacteria- Gobar gas formation

Match Column - I with Column - II and select the correct option from the codes given below

• A - (ii), B - (iii), C - (iv), D - (i)

• A - (iv), B - (i), C - (ii), D - (iii)

• A - (ii), B - (iii), C - (i), D - (iv)

• A - (iv), B - (i), C - (iii), D - (ii)

Deuteromycetes are known as fungi imperfecti because

• their zygote undergoes meroblastic and holoblastic cleavage

• only asexual stages are known

• they have aseptate myceliun

• they are autotrophic

The microscope usually used for seeing living cells or tissues is

• compound microscope

• electron micrscope

• phase contrast microscope

• light microscope.

Protista differs from monera in having

• cell wall

• autotrophic nutrition

• flagella

• nuclear membrane