Biology MCQs – Page 18

✅ C. Earthworm

Option A: Cockroach Option B: Snail Option C: Earthworm Option D: Star fish Correct Answer : Earthworm Read more

✅ A. 33 vertebrae

Option A: 33 vertebrae Option B: 33 pairs of vertebrae Option C: 25 vertebrae Option D: 31 vertebrae Correct Answer : 33 vertebrae Read more

✅ C. Amphibians

Option A: Reptiles Option B: Aves Option C: Amphibians Option D: Mammals. Correct Answer : Amphibians Read more

✅ D. All of these

Option A: The major event in it is accumulation of lactic aci Option B: Lactic acid accumulation turns pH in acidic range leading to muscle ach Option C: Ionic imbalance may also cause it. Option D: All of these Correct Answer : All of these Read more

✅ B. Unavailability of ATP, which is necessary to break the link between actin and myosin.

Option A: Accunulation of rigid proteins molecules in sarcoplam. Option B: Unavailability of ATP, which is necessary to break the link between actin and myosin. Option C: Decrease in body temperature after death. Option 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. Read more

✅ B. It contains joints, for the same purpose as present in human skeletal system

Option A: It permits gaseous exchange Option B: It contains joints, for the same purpose as present in human skeletal system Option C: It provides muscle attachment Option 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 Read more

✅ C. A hormone that regulates moulting in arthropods

Option A: An enzyme that digest endocuticle during an arthropodal ecdysis Option B: A newly formed exoskeleton in authropods Option C: A hormone that regulates moulting in arthropods Option D: A process that involves moulting Correct Answer : A hormone that regulates moulting in arthropods Read more

✅ C. Mesoderm.

Option A: Ectoderm. Option B: Endoderm. Option C: Mesoderm. Option D: All of these Correct Answer : Mesoderm. Read more

✅ C. Z- Line

Option A: H- zone Option B: M- Line Option C: Z- Line Option D: A band Correct Answer : Z- Line Read more

✅ A. Earthworm

Option A: Earthworm Option B: Round worm Option C: Tape worm Option D: Pin worm Correct Answer : Earthworm Read more

✅ C. 16nm

Option A: 7 nm. Option B: 8 nm Option C: 16nm Option D: 10-100 ?m. Correct Answer : 16nm Read more

✅ D. Thinning of body

Option A: Lengthening of the body. Option B: Shortening of the body. Option C: Widening of body Option D: Thinning of body Correct Answer : Thinning of body Read more

✅ D. All of these

Option A: To bind with actin Option B: To bind with tropomyosin. Option C: To bind with Ca2+ ions. Option D: All of these Correct Answer : All of these Read more

✅ D. They move by tube feet

Option A: They are surrounded by single or double pieces of hard skeleton. Option B: Their shell grows as the animal grows. Option C: They have hydrostatic skeleton. Option D: They move by tube feet Correct Answer : They move by tube feet Read more

✅ C. 6

Option A: 9 Option B: 5 Option C: 6 Option D: 7 Correct Answer : 6 Read more

✅ B. Procuticle

Option A: Epicuticle Option B: Procuticle Option C: Ectocuticle Option D: None of these Correct Answer : Procuticle Read more

✅ A. Z- lines get closer

Option A: Z- lines get closer Option B: A band becomes short Option C: 1 band elongates Option D: There is no change in sarcomere Correct Answer : Z- lines get closer Read more

✅ C. Tropomyosin gets removed from the binding sites of actin filaments.

Option A: Binding sites of actin get attached to the myosin hea Option B: Troponin uncovers the actin binding sites. Option C: Tropomyosin gets removed from the binding sites of actin filaments. Option D: Ca2+ goes back inside sarcoplasmic reticulum. Correct Answer : Tropomyosin gets removed from the binding sites of actin filaments. Read more

✅ B. CaCO3

Option A: CaPO4 Option B: CaCO3 Option C: CaSO4 Option D: SiO2 Correct Answer : CaCO3 Read more

✅ C. Alternating dark and light bands appear on their surface when visualized via a microscop

Option A: They appear darker than smooth muscles by naked ey Option B: Alternating dark and light bands appear on their surface when visualized by naked ey Option C: Alternating dark and light bands appear on their surface when visualized via a microscop Option D: All of these Correct Answer : Alternating dark and light bands appear on their surface… Read more