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Biology 1525 MCQs [All-Courses]

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Biology covers key concepts of life, organisms, and human systems with exam-focused notes for PPSC, FPSC, KPPSC, BPSC.,NTS, OTS, AJKPSC. Clear, concise topics help students prepare effectively for competitive tests.

All Topics  1525

Unlike other algae, diatoms do not readily decay due to___________?
A Nonliving cells
B Siliceous wall
C Mucilaginous wall
D Water proof cell
Correct Answer: Siliceous wall
The cell wall is usually composed of two overlapping halves called epitheca and hypotheca in__________?
A Diatoms
B Desmids
C Pyrrophyta
D Chlorophyta
Correct Answer: Diatoms
Cell wall is richly impregnated with silica in__________?
A Rhodophyta
B Phaeophyta
C Baciliariophyta
D Euglenophyta
Correct Answer: Baciliariophyta
Microfossile often present in petroleum producing formationsare those of__________?
A Diatioms
B Heliozoans
C Radiolarians
D Foraminiferans
Correct Answer: Diatioms
Centric discoid form of diatoms is__________?
A Diplaneis
B Coscinodiscus
C Camphyloneiscus
D Stephanodis
Correct Answer: Coscinodiscus
Diatoms are found in__________?
A Phytoplanktonic population
B Freshwater lakes and ponds
C Marine environment
D All of the above
Correct Answer: All of the above
Which one of the following is representing the group of diatoms?
A Pinnularia, Navicula, Cymbella, Melosira
B Euglenamorpha, Hedneria , Heteronema, Colacium
C Nostoc, Anabaena, Aulosira, Cylindrospermum
D Cochlodinium, Gymnodinium, Lenodinium, Peridinium
Correct Answer: Pinnularia, Navicula, Cymbella, Melosira
Diatoms belong to___________?
A Chrysophyta
B Bacillariophyceae
C Xanthophyceae
D Both A. and B.
Correct Answer: Both A. and B.
Which organisms are sometimes called the ” pastures of the sea”?
A Diatoms
B Radiolarians
C Dinoflagellates
D Foraminiferans
Correct Answer: Diatoms
The wax present on the body of cockroach is secreted:
A Mucocytes
B Leucocytes
C Oenocytes
D Granulocytes
Correct Answer: Oenocytes
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