Multiple Choice Questions

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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


B.

it shows saprotrophic mode of nutrition

Saprotrophic mode of nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of dead or decayed organic matter. The palnts which exhibit saprotrophic mode of nutrition are known as saprotrophs. Saprotroph organism is an organism which gets its energy from dead and decaying organic matter. 


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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.


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


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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

Column I Column II
A. Chlorophyta (i) Equisetum
B. Lycopsida (ii) Chara
C. Phaeophyta (iii) Selaginella
D. Sphenopsida (iv) Ectocarpus

  • 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.


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Protista differs from monera in having

  • cell wall

  • autotrophic nutrition

  • flagella

  • nuclear membrane


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