388991362-biology-13-9-14.docx - BINAYAK SCIENCE COLLEGE 2...

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BINAYAK SCIENCE COLLEGE +2 1 st year Science WEEKLY TEST-BIOLOGY FM: 35 Date:13/09/2014 Time: 1 Hr 30 Min Botany Q1. Multiple choice questions (1x6=6) a. Spirogyra is commonly known by the name of ‘pond scum’ or ‘pond silk’ because – (i) spirogyra filaments are not rough (ii) the filaments secretes a silky substance (iii) The pectose layer of spirogyra filaments becomes mucialaginous (iv) the cellulose layer secretes a mucilaginous substance b. Choose the correct statement about Spirogyra (i) filaments showing scalariform conjugation are always homothallic (ii) filaments with lateral conjugation are always homothallic (iii) filaments with lateral conjugation may be homothallic (iv) asexual reproduction occurs by zoospores c. The number of capsomeres present in TMV virus __________ (i) 1220 (ii) 2500 (iii)2130 (iv) 3130 d. The enzyme secreted by bacteriophase is ____________ (fill in the blanks) e. Which group of plants can grow in nitrogen deficient soils- (i) insectivorous plants (ii) bryophytes (iii) llichens (iv) gymnosperms f.
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