MCQOPTIONS
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MCQOPTIONS
This section includes 103 Mcqs, each offering curated multiple-choice questions to sharpen your Life Sciences knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What will be the ratio of oxygen produced to that of consumed in daylight hours when the rate of respiration is less than that of photosynthesis? |
| A. | 1: 1 |
| B. | 10: 1 |
| C. | 50: 1 |
| D. | 5: 1 |
| Answer» C. 50: 1 | |
| 52. |
Due to which reaction PGA is changed into phosphoglyceraldehyde in photosynthesis process? |
| A. | Oxidation |
| B. | Reduction |
| C. | Electrolysis |
| D. | Hydrolysis |
| Answer» C. Electrolysis | |
| 53. |
What is the first step in photosynthesis: |
| A. | Generation of ATP |
| B. | Formation of NADPH |
| C. | Through light, excitement of an electron of chlorophyll pigment. |
| D. | Formation of Glucose |
| Answer» D. Formation of Glucose | |
| 54. |
Which of the following statements are true regarding Photosystems? |
| A. | Photosystems are arrangements of chlorophyll and other pigments packed into thylakoids. |
| B. | Many Prokaryotes have only one photosystem. |
| C. | Both A and B are correct. |
| D. | Only A is correct. |
| Answer» D. Only A is correct. | |
| 55. |
Name the structural unit of photosynthesis? |
| A. | Thylakoid |
| B. | Grana |
| C. | Stroma |
| D. | Chlorophyll |
| Answer» B. Grana | |
| 56. |
Name the metal present in chlorophyll ‘a’ and ‘b’? |
| A. | Iron |
| B. | Copper |
| C. | Magnesium |
| D. | Manganese |
| Answer» D. Manganese | |
| 57. |
Quantasomes are found in: |
| A. | Cristae of mitochondria |
| B. | Thylakoid membrane of chloroplasts |
| C. | Nucleus membrane |
| D. | Lysosome |
| Answer» C. Nucleus membrane | |
| 58. |
In bacteria name the colour of light which is responsible for photosynthesis? |
| A. | Ultra-Violet |
| B. | Blue |
| C. | Red |
| D. | None of the above |
| Answer» D. None of the above | |
| 59. |
Name the pigment which is responsible for absorption of light in plants? |
| A. | Chlorophyll |
| B. | Stoma |
| C. | Xylem |
| D. | Phloem |
| Answer» B. Stoma | |
| 60. |
Photosynthesis is a _____ process. |
| A. | Catabolic |
| B. | Anabolic |
| C. | Exothermic |
| D. | Metabolic |
| Answer» C. Exothermic | |
| 61. |
For photosynthesis green plants require: |
| A. | Chlorophyll only |
| B. | Light |
| C. | Carbon dioxide and water |
| D. | All of the above |
| Answer» E. | |
| 62. |
Rate of photosynthesis does not depend upon: |
| A. | Quality of light |
| B. | Intensity of Light |
| C. | Duration of Light |
| D. | Temperature |
| Answer» D. Temperature | |
| 63. |
In photosynthesis dark reaction, is called so because- |
| A. | It occurs in dark. |
| B. | It does not require light energy. |
| C. | It cannot occur during daytime. |
| D. | It occurs more rapidly at night. |
| Answer» C. It cannot occur during daytime. | |
| 64. |
What is ploughing and cultivating the land called? |
| A. | Irrigation |
| B. | Domestication |
| C. | Tilling |
| D. | Weeding |
| Answer» D. Weeding | |
| 65. |
What is the act of supplying water to a field through artificial means called? |
| A. | Irrigation |
| B. | Insecticide |
| C. | Fungicide |
| D. | Monoculture |
| Answer» B. Insecticide | |
| 66. |
What are heterotrophs, mostly bacteria and fungi, when obtain food by breaking down substances in dead protoplasm are called: |
| A. | Omnivores |
| B. | Herbivores |
| C. | Decomposers |
| D. | Carnivores |
| Answer» D. Carnivores | |
| 67. |
The complex feeding relationships within a community is called: |
| A. | Food chain |
| B. | Food web |
| C. | Trophic level |
| D. | All of the above |
| Answer» C. Trophic level | |
| 68. |
Organic constituents of soil formed by complete or partial decomposition of plant and animal material is called: |
| A. | Fauna |
| B. | Humus |
| C. | Fossil |
| D. | Compost |
| Answer» C. Fossil | |
| 69. |
A group of glands which produce various hormones is called: |
| A. | Respiratory system |
| B. | Excretion |
| C. | Endocrine system |
| D. | Central nervous system |
| Answer» D. Central nervous system | |
| 70. |
What is the shedding of flowers, leaves and fruits followed by formation of scar tissue in a plant called? |
| A. | Abscission |
| B. | Abscisic acid |
| C. | Deciduous |
| D. | Mitosis |
| Answer» B. Abscisic acid | |
| 71. |
What are those animals called which eat both plants and animals? |
| A. | Omnivores |
| B. | Herbivores |
| C. | Carnivores |
| D. | Decomposers |
| Answer» B. Herbivores | |
| 72. |
Those organs which have different basic structure but have similar appearance and perform similar functions are called: |
| A. | Fossils |
| B. | Analogous organs |
| C. | Homologous organs |
| D. | Speciation |
| Answer» C. Homologous organs | |
| 73. |
Those organs which have same basic structure but different functions are called: |
| A. | Analogous organs |
| B. | Speciation |
| C. | Fossils |
| D. | Homologous organs |
| Answer» D. Homologous organs | |
| 74. |
The transfer of pollen grains the anther of a stamen to the stigma of a carpel is called: |
| A. | Germination |
| B. | Pollination |
| C. | Fertilisation |
| D. | Tissue culture |
| Answer» C. Fertilisation | |
| 75. |
When the cut stems of two different plants are joined together in such a way that the two stems join and grow as a single plant, it is called: |
| A. | Cutting |
| B. | Layering |
| C. | Grafting |
| D. | None of the above |
| Answer» D. None of the above | |
| 76. |
When new plants are obtained from the parts of old plants, without the help of any reproductive organs, it is called: |
| A. | Vegetative propagation |
| B. | Spore formation |
| C. | Fragmentation |
| D. | Multiple fission |
| Answer» B. Spore formation | |
| 77. |
The breaking up of the body of a simple organism into two or more pieces on maturing, each of which subsequently grows to form a complete new organism, is called: |
| A. | Fragmentation |
| B. | Vegetative propagation |
| C. | Binary fission |
| D. | Budding |
| Answer» B. Vegetative propagation | |
| 78. |
The process of getting back a full organism from its body part is called: |
| A. | Spore formation |
| B. | Budding |
| C. | Regeneration |
| D. | Fragmentation |
| Answer» D. Fragmentation | |
| 79. |
When the parent organism splits to form two new organisms, it is called: |
| A. | Budding |
| B. | Spore formation |
| C. | Binary fission |
| D. | Multiple fission |
| Answer» D. Multiple fission | |
| 80. |
The chemical substances which coordinate the activities of living organisms and also their growth are called: |
| A. | Hormones |
| B. | Blood |
| C. | Sodium |
| D. | Cytoplasm |
| Answer» B. Blood | |
| 81. |
What are those reflex actions called which involve brain? |
| A. | Reflex arcs |
| B. | Cerebral reflexes |
| C. | Spinal reflexes |
| D. | None of the above |
| Answer» E. | |
| 82. |
The axon passes the impulse to another neuron through a junction called: |
| A. | Nerve endings |
| B. | Synapse |
| C. | Cytoplasm |
| D. | Nucleus |
| Answer» C. Cytoplasm | |
| 83. |
The longest fibre on the cell body of a neuron is called: |
| A. | Myelin |
| B. | Nerve endings |
| C. | Axon |
| D. | Dendrites |
| Answer» D. Dendrites | |
| 84. |
The shorter fibres on the body of a neuron are called: |
| A. | Dendrites |
| B. | Axon |
| C. | Cytoplasm |
| D. | Myelin sheath |
| Answer» B. Axon | |
| 85. |
The non-directional movement of a plant part in response to light is called: |
| A. | Phototropism |
| B. | Thigmotropism |
| C. | Geotropism |
| D. | Photonasty |
| Answer» E. | |
| 86. |
The pad-like swelling at the base of each leaf of a sensitive plant is called: |
| A. | Pistol |
| B. | Scape |
| C. | Pulvini |
| D. | Foliage |
| Answer» D. Foliage | |
| 87. |
The non-directional movement of a plant part in response to the touch of an object is called: |
| A. | Thigmotropism |
| B. | Thigmonasty |
| C. | Phototropism |
| D. | Photonasty |
| Answer» C. Phototropism | |
| 88. |
The directional movement of a plant part in response to the touch of an object is called: |
| A. | Phototropism |
| B. | Geotropism |
| C. | Thigmotropism |
| D. | Hydrotropism |
| Answer» D. Hydrotropism | |
| 89. |
The movement of a plant part in response to water is called: |
| A. | Geotropism |
| B. | Hydrotropism |
| C. | Chemotropism |
| D. | Thigmotropism |
| Answer» C. Chemotropism | |
| 90. |
The movement of a plant part in response to a chemical stimulus is called: |
| A. | Hydrotropism |
| B. | Chemotropism |
| C. | Thigmotropsim |
| D. | Phototropism |
| Answer» C. Thigmotropsim | |
| 91. |
The movement of plant part in response to gravity is called: |
| A. | Thigmotropism |
| B. | Hydrotropism |
| C. | Phototropism |
| D. | Geotropism |
| Answer» E. | |
| 92. |
The movement of a plant part in response to light is called: |
| A. | Phototropism |
| B. | Geotropism |
| C. | Chemotropism |
| D. | Hydrotropism |
| Answer» B. Geotropism | |
| 93. |
The process of removal of toxic wastes from the body of an organism is called: |
| A. | Transport |
| B. | Respiration |
| C. | Excretion |
| D. | Nutrition |
| Answer» D. Nutrition | |
| 94. |
WHAT_IS_THE_LOCATION_OF_PHOTOSYNTHETIC_PIGMENT_IN_AN_OXYGENIC_PHOTOSYNTHETIC_ORGANISM??$ |
| A. | Plasma membranes |
| B. | Thylakoid membranes |
| C. | Chromatophores |
| D. | Chlorosome |
| Answer» C. Chromatophores | |
| 95. |
NAME_THE_PHOTOSYNTHETIC_PIGMENT_WHICH_IS_STRUCTURALLY_SIMILAR_TO_BILE_PIGMENT_BILIRUBIN??$ |
| A. | Chlorophyll |
| B. | Carotene |
| C. | Xanthophyll |
| D. | Phycobilins |
| Answer» E. | |
| 96. |
Name the mechanism which prevents photo-oxidative damage in plants? |
| A. | Photosynthesis |
| B. | Photorespiration |
| C. | Photoprotection |
| D. | Phytoprotection |
| Answer» D. Phytoprotection | |
| 97. |
Accessory pigments absorb light at more wavelengths as compared to chlorophyll. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 98. |
Name the pigment which is responsible for the yellow color of leaves in autumn and orange color of carrots? |
| A. | Phycobilins |
| B. | Chlorophylls |
| C. | Carotenoids |
| D. | Bacteriochlorophyll |
| Answer» D. Bacteriochlorophyll | |
| 99. |
Which of these features are not of chlorophyll? |
| A. | It has Mg<sup>2+</sup> as the central metal ion |
| B. | It has cyclopentanone ring fused with a pyrrole ring |
| C. | It has a planer tetrapyrrole ring structure |
| D. | It is water-soluble pigment |
| Answer» E. | |
| 100. |
Which of the following is not a lipid-soluble photosynthetic pigment? |
| A. | Phycobilins |
| B. | Carotenoids |
| C. | Chlorophyll |
| D. | Xanthophylls |
| Answer» B. Carotenoids | |