MCQOPTIONS
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MCQOPTIONS
This section includes 1275 Mcqs, each offering curated multiple-choice questions to sharpen your Biology Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1051. |
The air spaces may comprise upto _________ of total volume of leaf surface? |
| A. | 30% |
| B. | 20% |
| C. | 40% |
| D. | 50% |
| Answer» D. 50% | |
| 1052. |
Percentage of CO2 carried as carboxyhaemoglobin is_________? |
| A. | 5% |
| B. | 70% |
| C. | 20% |
| D. | 10% |
| Answer» D. 10% | |
| 1053. |
Arterial blood contains _________ of CO2 per 100 ml of blood |
| A. | 54 ml |
| B. | 60 ml |
| C. | 64 ml |
| D. | 50 ml |
| Answer» E. | |
| 1054. |
The increase in pH of blood has ________ effect on the oxygen carrying capacity of haemogolobin? |
| A. | plus ve |
| B. | – ve |
| C. | No |
| D. | All of these |
| Answer» B. – ve | |
| 1055. |
Which of the following promotes growth in plants? |
| A. | Photorespiration |
| B. | Calvin cycle |
| C. | Both of these |
| D. | None of these |
| Answer» C. Both of these | |
| 1056. |
Which of the following animals has a respiratory system with one way flow of the air through the lungs, and the air is renewed after inspiration? |
| A. | Cockroach |
| B. | Earthworm |
| C. | Aves |
| D. | Frogs |
| Answer» D. Frogs | |
| 1057. |
When abdomen expands, the number of spiracles open is_____________? |
| A. | 2 |
| B. | 3 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 1058. |
The blood enters the ________________ side of heart ? |
| A. | Posterior |
| B. | Anterior |
| C. | Lateral |
| D. | All possible |
| Answer» B. Anterior | |
| 1059. |
A fracture hematoma has____________? |
| A. | Healing properties |
| B. | Destructive properties |
| C. | Neutralizing properties |
| D. | Dead cells |
| Answer» E. | |
| 1060. |
Epinasty is controlled by_____________? |
| A. | Gibberellins |
| B. | Abscisins |
| C. | Auxins |
| D. | Cytokinins |
| Answer» D. Cytokinins | |
| 1061. |
Vascular Cambium initially appears as actively dividing cells between_________________? |
| A. | Primary Xylem and secondary xylem |
| B. | Primary xylem and secondary phloem |
| C. | Primary xylem and primary phloem |
| D. | Secondary xylem and secondary phloem |
| Answer» D. Secondary xylem and secondary phloem | |
| 1062. |
If two ends of fractured bone are opened and kept united via screws and wires drilled in bone substance. This step in fracture repair is called___________? |
| A. | Open reduction |
| B. | Closed Fixation |
| C. | Open fixation |
| D. | Immobilization |
| Answer» B. Closed Fixation | |
| 1063. |
Gibberellins is an example of_________________? |
| A. | Growth inhibitor |
| B. | Growth stimulator |
| C. | Growth hormone |
| D. | None of these |
| Answer» C. Growth hormone | |
| 1064. |
Fibrous capsule surrounding synovial joints may be thickened at some places to form: |
| A. | Synovial membrane |
| B. | Ligaments |
| C. | Muscles |
| D. | Tendon |
| Answer» C. Muscles | |
| 1065. |
Sperms of liverworts, mosses, ferns move towards archegonia, in response to uncleic acid released by the ovum. This is an example of ____________? |
| A. | Chemotropic movement |
| B. | Chemotactic movement |
| C. | Chemosastic movement |
| D. | Haptonastic movement |
| Answer» C. Chemosastic movement | |
| 1066. |
If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules: |
| A. | 9 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 1067. |
Bony callus formation completes in___________? |
| A. | 2-3 weeks |
| B. | 3-4 weeks. |
| C. | 2-3 months. |
| D. | 3-4 months. |
| Answer» D. 3-4 months. | |
| 1068. |
In which of the following joint muscles are arranged in the same plane as that of joint? |
| A. | Between radius and ulna |
| B. | Between ulna and scapula |
| C. | Between humerus and scapula |
| D. | Between femur and tibia |
| Answer» E. | |
| 1069. |
Which of the following hormone is predominantly responsible for bone weakening in older women? |
| A. | Progesterone |
| B. | Oestrogen |
| C. | Parathyroid hormone |
| D. | Calcitonin |
| Answer» C. Parathyroid hormone | |
| 1070. |
Secondary cell wall of sclerenchyma cells is impregnated with_________________? |
| A. | Cellulose |
| B. | Peptidoglycan and murein |
| C. | Lignin |
| D. | Pectin |
| Answer» D. Pectin | |
| 1071. |
All of the following contain cartilage except:___________? |
| A. | Larynx |
| B. | Trachea |
| C. | Bronchi |
| D. | Bronchioles |
| Answer» E. | |
| 1072. |
Which of the follwing is a childhood disease resulting from nutritive Ca2+ deficiency? |
| A. | Hypocalcaemia Tatanic spasms |
| B. | Osteomalacis |
| C. | Rickets |
| D. | Tetany |
| Answer» D. Tetany | |
| 1073. |
Voice box is another name used for___________? |
| A. | Buccal cavity |
| B. | Pharynx |
| C. | Larynx |
| D. | Chest Cavity |
| Answer» D. Chest Cavity | |
| 1074. |
Vocal cords are stretched across_______? |
| A. | Larynx |
| B. | Pharynx |
| C. | Golttis |
| D. | None of these |
| Answer» D. None of these | |
| 1075. |
Parabronchi are open at ______________ end/s? |
| A. | Single |
| B. | Both |
| C. | Do not have opening |
| D. | None of these |
| Answer» C. Do not have opening | |
| 1076. |
Gaseous exchange through the skin is known as ______________ respiration? |
| A. | Cuticular |
| B. | Cutaneous |
| C. | Skin |
| D. | Pulmonary |
| Answer» C. Skin | |
| 1077. |
In most birds air sacs are ____________ in number? |
| A. | 10 |
| B. | 3 |
| C. | 4 |
| D. | 9 |
| Answer» E. | |
| 1078. |
Joint between two parietal bones, which is infact immovable one is an example of_________? |
| A. | Fibrous joints |
| B. | Cartilaginous joints |
| C. | Synovial joints |
| D. | None of these |
| Answer» B. Cartilaginous joints | |
| 1079. |
A joint formed between humerus, radius and ulna is an example of__________? |
| A. | Immovable joint |
| B. | Slightly movable joint |
| C. | Freely movable joint |
| D. | Fibrous joint |
| Answer» D. Fibrous joint | |
| 1080. |
Which of the following plays the major role in providing support to young herbaceous parts of the plant? |
| A. | Living cells of epidermis with higher turgor pressure |
| B. | Living cells of cortex and pith with higher turgor pressure |
| C. | Collenchyma cells |
| D. | All of these |
| Answer» E. | |
| 1081. |
Which of the following statement about osteoporosis is incorrect. |
| A. | It results from estrogen deficiency. |
| B. | Bone eating process takes over bone formation process. |
| C. | There is reduction of bone mass and change in chemical composition of the matrix |
| D. | It is common in old age |
| Answer» D. It is common in old age | |
| 1082. |
The place of attachment of leaf with the shoot is called__________? |
| A. | Pith |
| B. | Pit |
| C. | Pulvinus |
| D. | Ecdysone |
| Answer» D. Ecdysone | |
| 1083. |
Which of the following statements about fractures in old age is incorrect? |
| A. | They are more common than in adult age |
| B. | Occur as a result of bone being thin and weak |
| C. | Due to good blood supply it results in quick healing |
| D. | It involves osteoblasts and osteocytes |
| Answer» D. It involves osteoblasts and osteocytes | |
| 1084. |
An increrase in plant girth due to activity of _____________ is called secondary growth? |
| A. | Cork cambium |
| B. | Pith |
| C. | Vascular cambium |
| D. | Both a and c |
| Answer» E. | |
| 1085. |
Which of the following is a uni-nucleated cell? |
| A. | A smooth muscle cell. |
| B. | A cardiac muscle cell. |
| C. | A skeletal muscle cell. |
| D. | All of these |
| Answer» B. A cardiac muscle cell. | |
| 1086. |
The contraction of which of the following muscle fibers, is controlled by hormones? |
| A. | A smooth muscle |
| B. | A cardiac muscle |
| C. | A skeletal muscle |
| D. | All of these |
| Answer» B. A cardiac muscle | |
| 1087. |
Rapid movement of leaves of mimosa on touching is an example of _____________? |
| A. | Turgor movement |
| B. | Nastic movement |
| C. | Tropic movements |
| D. | Growth movement |
| Answer» B. Nastic movement | |
| 1088. |
Exoskeleton of a marine snail is composed of________________? |
| A. | CaPO4 |
| B. | CaCO3 |
| C. | CaSO4 |
| D. | SiO2 |
| Answer» C. CaSO4 | |
| 1089. |
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. |
| Answer» C. Decrease in body temperature after death. | |
| 1090. |
Which of the following animal has a hydrostatic skeleton? |
| A. | Earthworm |
| B. | Round worm |
| C. | Tape worm |
| D. | Pin worm |
| Answer» B. Round worm | |
| 1091. |
Diameter of thick filament is____________? |
| A. | 7 nm |
| B. | 8 nm |
| C. | 16nm |
| D. | 10-100 nm |
| Answer» D. 10-100 nm | |
| 1092. |
In an annelids, the contraction of circular muscle results in___________? |
| A. | Lengthening of the body |
| B. | Shortening of the body |
| C. | Widening of body |
| D. | Thinning of body |
| Answer» E. | |
| 1093. |
A smallest contractile unit of muscle contraction called sarcomere is the area between two: |
| A. | H- zone |
| B. | M- Line |
| C. | Z- Line |
| D. | A band |
| Answer» D. A band | |
| 1094. |
The most important function of troponin is___________? |
| A. | To bind with actin |
| B. | To bind with tropomyosin |
| C. | To bind with Ca2+ ions |
| D. | All of these |
| Answer» E. | |
| 1095. |
Which one of the following forms the blk of exoskeleton of an arthropod? |
| A. | Epicuticle |
| B. | Procuticle |
| C. | Ectocuticle |
| D. | None of these |
| Answer» C. Ectocuticle | |
| 1096. |
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. |
| Answer» D. Ca2+ goes back inside sarcoplasmic reticulum. | |
| 1097. |
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 |
| Answer» B. A band becomes short | |
| 1098. |
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 |
| Answer» D. A process that involves moulting | |
| 1099. |
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 |
| Answer» C. It provides muscle attachment | |
| 1100. |
Which one of the following is avascular structure? |
| A. | A compact bone. |
| B. | A spongy bone. |
| C. | Cartilage |
| D. | All of these |
| Answer» D. All of these | |