biology MCQs – Page 24

Practise multiple-choice questions from biology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

biology Mcqs
461. Which of following system is segmentally arranged in annelids?
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A. Criculatory system

B. Digestive system

C. Nervous system

D. Excretory system

462. Which of the following statement is incorrect about algae______________?
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A. Their zygote unlike plants is protected by parental tissue

B. Most of them have different morphological forms in-different stages of their life cycle

C. Their classification is based on pigment composition

D. Almost all of them are aquatic

463. All of the following coelenterates show alternation of generation except:
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A. Obelia

B. Hydra

C. None of these

D. Aurelia

464. Of the following, which one is missing in herbivores_______________?
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A. Premolars

B. Incisors

C. Molars.

D. Canines
465. Cyanobacteria have ________ cell wall?
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A. Gram ve.

B. Gram +ve.

C. Acid fast

D. Cellulose rich

466. Free living example of Platyhelminthes is____________?
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A. Dugesia

B. Fasciola

C. None of these

D. Taenia

467. The only group of algae having no flagellated motile cells at any stage is___________?
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A. Rhodophyta

B. Phaeophyta

C. Pyrrophyta

D. Chrysophyta

468. Midgut in cockroach is a short narrow tube called____________?
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A. Hepatic caeca

B. Stomach

C. Rectum

D. Gizzard

469. cells are of__________types?
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A. 2

B. 1

C. 3

D. 4

470. E. coli and example of entrobacteriace is important for causing diarrheal diseases its size is____________?
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A. 0.75-1.25 um

B. 1.1-1.5 um (width) 2.0-6.0 um (length)

C. 100-200 nm

D. 0.1-600 um

471. Antheridia and archegonia are born on ______________ in bryophytes.
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A. Sporophyte

B. Gametophyte

C. Both of these

D. None of these

472. Which of the following is incorrect for the lysogenic cycle in life cycle of bacteriophage_____________?
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A. The cycle may convert into lytic type resulting from environmental exposure

B. Phage when gets incorporated with the bacterial chromosome is called prophage

C. The bacterium continues to live and reproduce normally

D. Lysogenic bacteria may get infected by the related phage
473. Gram positive bacteria appear_______________?
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A. Purple

B. Pink

C. Red

D. Blue

474. Based on molecular data euglenoids are thought to be closely related to___________?
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A. Zooflagellates

B. Algae

C. Protozoans

D. Dinoflagellates

475. An isolated virus is not considered living since it________________?
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A. Is coated with an air tight shield

B. Can not metabolize

C. Separates in to two inner parts

D. Rapidly looses its Genome chemical inert

476. Chemical substances used on living tissues that inhibit the growth of micro organism are called___________?
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A. Disinfectants

B. Vaccines

C. Antiseptics

D. Antibiotics

477. Nervous system of nematods consists of?
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A. All of these

B. Lateral nerve cord

C. Dorsal nerve cord

D. Ventral nerve cord

478. Which of the following statement about plants is incorrect?
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A. They are multicellular.

B. They Are heterotrophes

C. All are eukaryotes

D. Non-motile organisms

479. Nodules on roots of leguminous plants have __________ bacteria?
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A. Anaerobic

B. Ammonifying

C. Nitrogen fixing

D. Nitrifying

480. in animals meiosis produces____________?
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A. spores

B. gametes

C. both a & b

D. all the above