General Science Questions (MCQs) for Competitive Examinations

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With its excess secretion, also known as hypersecretion, thyroxine (T4) causes an increased heart rate, high blood pressure, possible palpitations, and could lead to heart failure. It is related to hyperthyroidism.

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Insectivorous plants are : Aldrovanda, Archaeamphora, Brocchinia, Byblis, Catopsis, Dionaea, Drosera, Genlisea, Hel iamphora, Nepenthes, Palaeoaldrovanda, Philcoxia, Roridule, Sarracenia, Stylidium, Triphyophyllum, Utricularia etc. In India, it was introduced by Dr. M. Swaminathan under the leadership of Pt. Nehru.

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Pyria, or periodontal disease, is a progressive gum disease characterized by inflammation resulting from the toxins found in plaque. It leads to bleeding of the gums. If allowed to progress, Pyria begins to destroy underlying tissue, which may eventually lead to premature tooth loss.

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Phototropism is the growth of organisms in response to light. In plants, phototropism is a response to blue wavelengths of light and is caused by a redistribution of auxin from the illuminated side to the darker side of the shoot, resulting in quicker growth on the darker side and bending of the shoot toward the source of light.

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Dysentery is an intestinal infection that causes severe diarrhea with blood. Bacterial dysentery is caused by infection with bacteria from Shigella, Campylobacter, Salmonella, or enterohemorrhagic E. coli. Diarrhea from Shigella is also known as shigellosis. Shigellosis and amebic dysentery typically result from poor sanitation.

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Bone is a composite of proteins such as collagen and minerals such as calcium. Calcium phosphate is the major component of bones and teeth. Except for small portions of the inner ear, all hard tissues of the human body are formed of calcium phosphate. Collagen gives the bones a soft framework, while calcium makes them hard and strong.

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Some plants have the stem branching out near the base. The stem is hard but not thick. Such plants are called shrubs. Eg: Rose plant. Shrubs have persistent woody stems above the field, unlike herbaceous plants. Shrubs may be evergreen or deciduous. By their numerous stems and shorter height, less than 6 m-10 m long, they are distinguished from trees.

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Mycoplasmas are the smallest and simplest prokaryotes capable of self-replication. Keeping the number of structural elements, metabolic pathways and components of the protein synthesizing machinery to an essential minimum places Mycoplasmas closest to the concept of ‘minimum cells’.

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The arteries (red) carry oxygen and nutrients away from your heart, to your body’s tissues. The veins (blue) take oxygen-poor blood back to theheart. Arteries begin with the aorta, the large artery leaving the heart. They carry oxygen-rich blood away from the heart to all of the body’s tissues.

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The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes. The human heart has four chambers: two upper chambers (the atria) and two lower ones (the ventricles).