M C Q s D r i v e
03079682698
mcqsdrive@gmail.com
About
Contact

Contact Info

03079682698

mcqsdrive@gmail.com

Ad Banner

Biology 1525 MCQs [All-Courses]

thumb

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

Ecdysone is_________________?
A An enzyme that digest endocuticle during an arthropodal ecdysis
B A newly formed exoskeleton in authropods
C A hormone that regulates moulting in arthropods
D A process that involves moulting
Correct Answer: A hormone that regulates moulting in arthropods
Which of the following statement about an arthropod exoskeleton is incorrect?
A It permits gaseous exchange
B It contains joints, for the same purpose as present in human skeletal system
C It provides muscle attachment
D Like all the other types of exoskeleton, they lack sensation
Correct Answer: It contains joints, for the same purpose as present in human skeletal system
Rigor mortis i.e, stiffening of body after death results from__________?
A Accunulation of rigid proteins molecules in sarcoplam.
B Unavailability of ATP, which is necessary to break the link between actin and myosin.
C Decrease in body temperature after death.
D Death of tissue due to unavailability of O2.
Correct Answer: Unavailability of ATP, which is necessary to break the link between actin and myosin.
Exoskeleton of a marine snail is composed of________________?
A CaPO4
B CaCO3
C CaSO4
D SiO2
Correct Answer: CaCO3
Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.
A Binding sites of actin get attached to the myosin head.
B Troponin uncovers the actin binding sites.
C Tropomyosin gets removed from the binding sites of actin filaments.
D Ca2+ goes back inside sarcoplasmic reticulum.
Correct Answer: Tropomyosin gets removed from the binding sites of actin filaments.
What happens during muscle contraction to the length of each myosin and action filament?
A Z- lines get closer
B A band becomes short
C 1 band elongates
D There is no change in sarcomere
Correct Answer: Z- lines get closer
Which one of the following forms the blk of exoskeleton of an arthropod?
A Epicuticle
B Procuticle
C Ectocuticle
D None of these
Correct Answer: Procuticle
Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.
A Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment
B Trimethyl alanine
C Ammonia
D Trimethylamine oxide
Correct Answer: Trimethylamine oxide
In a hot summer after noon, if your body’s Homeostatic machinery keep your internal temperature quite lower than that of external than this is an example of____________?
A Positive feed back
B Negative feed back
C Feed back
D Osmoregulation
Correct Answer: Negative feed back
Rose is an example of____________?
A Hydrophytes
B Mesophytes
C Xerophytes
D Halophytes
Correct Answer: Mesophytes
03079682698
mcqsdrive@gmail.com

Copyright @ 2026 MCQsDrive . All Rights Reserved.