Biology 1525 MCQs [All-Courses]

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.

Unlike other algae, diatoms do not readily decay due to___________?

A Nonliving cells

B Siliceous wall

C Mucilaginous wall

D Water proof cell

Review Detailed Answer

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

Review Detailed Answer

Correct Answer: Diatoms

Cell wall is richly impregnated with silica in__________?

A Rhodophyta

B Phaeophyta

C Baciliariophyta

D Euglenophyta

Review Detailed Answer

Correct Answer: Baciliariophyta

Microfossile often present in petroleum producing formationsare those of__________?

A Diatioms

B Heliozoans

C Radiolarians

D Foraminiferans

Review Detailed Answer

Correct Answer: Diatioms

Centric discoid form of diatoms is__________?

A Diplaneis

B Coscinodiscus

C Camphyloneiscus

D Stephanodis

Review Detailed Answer

Correct Answer: Coscinodiscus

Diatoms are found in__________?

A Phytoplanktonic population

B Freshwater lakes and ponds

C Marine environment

D All of the above

Review Detailed Answer

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

Review Detailed Answer

Correct Answer: Pinnularia, Navicula, Cymbella, Melosira

Diatoms belong to___________?

A Chrysophyta

B Bacillariophyceae

C Xanthophyceae

D Both A. and B.

Review Detailed Answer

Correct Answer: Both A. and B.

Which organisms are sometimes called the ” pastures of the sea”?

A Diatoms

B Radiolarians

C Dinoflagellates

D Foraminiferans

Review Detailed Answer

Correct Answer: Diatoms

The wax present on the body of cockroach is secreted:

A Mucocytes

B Leucocytes

C Oenocytes

D Granulocytes

Review Detailed Answer

Correct Answer: Oenocytes

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Biology 1525 MCQs [All-Courses]

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All Topics 1525

Unlike other algae, diatoms do not readily decay due to___________?

The cell wall is usually composed of two overlapping halves called epitheca and hypotheca in__________?

Cell wall is richly impregnated with silica in__________?

Microfossile often present in petroleum producing formationsare those of__________?

Centric discoid form of diatoms is__________?

Diatoms are found in__________?

Which one of the following is representing the group of diatoms?

Diatoms belong to___________?

Which organisms are sometimes called the ” pastures of the sea”?

The wax present on the body of cockroach is secreted: