Biology

Biology Multiple Choice Questions and Answers (MCQ) PDF: Quizzes & Practice Tests with Answer Key. This section Biology basic concepts, theory and objective tests.

This section covers following topic MCQs: Bioenergetics, biological molecules, cell biology, coordination and control, enzymes, fungi, recyclers kingdom, gaseous exchange, growth and development, kingdom Animalia, kingdom plantae, kingdom prokaryotae, kingdom protoctista, nutrition, reproduction, support and movements, transport biology, variety of life, and homeostasis etc.

    Heredity and Evolution
    The preserved traces of living organisms are known as:
    The preserved traces of living organisms like plants, animals, insects from remote pastare known as fossils. Study of fossils is known as paleontology. Fossils are studied to understand the process of evolution and to establishevolutionaryrelationships.
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    Biodiversity Introduction
    Relationship between two organisms that is beneficial to both, known as
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    Homeostasis
    Homeostasis usually returns the body to a healthy state after stressful stimuli by:
    Negative feedback is far more common in maintaining homeostasis than is positive feedback.
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    Cell Cycle
    In which of following stages do chromatids align along mitotic spindle?
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    Cell Cycle
    Which of following results from loss of cell cycle control?
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    Homeostasis
    How does homeostasis return the body to a healthy state after stressful stimuli? By producing a:
    It refers to negative feedback. Positive feedback is also possible (but rare); nevertheless, choice A is the best answer.
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    Homeostasis
    In homeostasis, what is it that produces the response that moves the physiological variable back towards the middle of its healthy range?
    The effector produces the effect that it is directed to by the integrating centre. That direction is passed along the efferent (or outgoing) pathway.
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    Cell Cycle
    Which of following enzyme cleaves cohesin proteins?
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    Homeostasis
    As acidic chyme enters the duodenum from the stomach, what homeostatic response would the digestive system produce?
    Homeostasis tends to respond to a detected change with “negative feedback”. The duodenum requires an alkaline environment, so the arrival of acidic chyme would result in a response that causes duodenal pH to rise. By closing the pyloric sphincter, the alkaline pancreatic juice and alkaline brush border secretions will have time to restore duodenal pH to the required level of about 7.4.
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    Cell Cycle
    For division of which of following cells, Platelet-derived Growth Factor (PDGF) is required?
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