Biology Test 1 Please don't use any search browser to find the answer. Just do it yourself so you can measure your knowledge power. Best of Luck! Please! Enter Password 1 / 50 What is the total body weight of human skeleton? 40% 80% 70% 18% 2 / 50 The condition of small skull is: Cleft palate Microcephaly Polydactyl Haemophilia 3 / 50 The allele that masks the effects of the other and the masked allele are known as: Dominant, incomplete Dominant, recessive Homozygous, heterozygous Homozygous, recessive 4 / 50 Analogous structures: Have same functions but different structures None of the above Have different structures and functions Have same structures but different functions 5 / 50 Excessive production of thyroid hormones by the thyroid gland: can cause nervousness, irregular heartbeat, and weight loss can cause a goiter is called hypothyroidism can cause stunted growth and retardation in children 6 / 50 Which of the followings are formed during gastrulation? Endoderm Ectoderm Mesoderm All of the above 7 / 50 The highest part of the nervous system is: Dorsal root ganglia of thoracic nerves Medulla oblongata The highest part of the nervous system is: Cerebral cortex 8 / 50 Birds maintain their body temperature within a range of: 25C to 35C 30C to 40C 41C to 43C 36C to 38C 9 / 50 What is the role of progesterone hormone in women? Follicle development Development of the uterine lining Spermatogenesis Female secondary sex characteristics 10 / 50 What proportion of UV radiation from the sun normally absorbed by the atmospheric layer of ozone? Less than 10% around a quarter about half More than 99% 11 / 50 Mango plant is: Mesophyte Xerophyte Hydrophyte None of the above 12 / 50 Prior to maturation and ejaculation, sperms are stored in the: Seminal vesicle Prostate gland Epididymis Ejaculatory duct 13 / 50 The liver is: Smallest internal organ Medium-sized internal organ Body s largest internal organ All options are incorrect 14 / 50 Which type of tissue enables a person’s fingers to move as he or she plays the piano? Nerve Muscle Connective Joints 15 / 50 The process by which the sperms are produced is known as: Oogenesis Spermatogenesis Ovulation Gestation 16 / 50 Lactic acid fermentation takes place In Muscles Pancreas Liver Heart 17 / 50 The role of cytoplasm in development is: (Does not take part in development Turns the genes on and off Acts as template to form new structure Receives information from nucleus 18 / 50 The hormone involve in birth is: Oxytocin Thyroxin Calcitonin Prolactin 19 / 50 The best description of when ovulation occurs in the human is: 14 days before the beginning of menstruation 14 days after the end of menstruation Exactly midway between menstrual cycles 14 days after the beginning of menstruation 20 / 50 A neuron with its axon connected to another neuron and its dendrites connected to a receptor: Sensory Motor Unipolar Association 21 / 50 Which of the following pollutants causes ozone holes in the ozone layer? CFC SO2 CO CO2 22 / 50 What is the average weight of the human heart? 500g 200g 300g 250g 23 / 50 Which stage of the human life cycle occurs first? Adulthood Childhood Puberty Adolescence 24 / 50 What is the mixed gland of the human body? Pancreas Thyroid Liver Pituitary 25 / 50 Metabolic water is: (B) and (C) (C) Useful to desert mammals (B) Produced by oxidation of fats (A) Water outside the cells of animals 26 / 50 What is the risk of a colour blind child in a family when mother is colour -blind but father is normal? 25% 50% 100% 75% 27 / 50 During emergencies, the “fight-or-flight” response: is caused by hormone secretions in the adrenal medulla is the result of aldosterone causing faster blood flow is stimulated by cortisol Decrease the heartrate 28 / 50 DNA was first discovered in 1869 by: Franklind Watson and crick P.A. Levene F. Miescher 29 / 50 Which among the followings is not a major use of CFCs? Pressurizing agent in aerosol cans Buoyancy gas for blimps and balloons Production of plastic foams Cleaning of computer parts 30 / 50 Chemotherapy: is also done in cancer patients High level of blood cholesterol Kills the cancer cells a condition in which liver cells lack receptor for removing cholesterol 31 / 50 Fungi animals and plants may consist of up to? Trillions of cells Millions of cells None of the above Billions of cells 32 / 50 What is a chromatid? A chromosome found outside the nucleus A chromosome in G1 of the cell cycle A special region that holds two centromeres together A replicate chromosome 33 / 50 During emergencies, the “fight-or-flight” response: is stimulated by cortisol is the result of aldosterone causing faster blood flow Decrease the heartrate is caused by hormone secretions in the adrenal medulla 34 / 50 Pseudopodia: A.F Huxley Lock jaw Amoeba Endoskeleton 35 / 50 All other chromosomes except X and Y chromosomes are called: Sex chromosomes Monosomes Pseudosomes Autosomes 36 / 50 ------have a limited number of organelles? None of the above Eukaryotes organ system Prokaryotes 37 / 50 Glands in the endocrine system: Produce hormones that are secreted into the digestive tract Release hormones into the bloodstream or the fluid around cells None of the above Release hormones as rapidly as nerve impulses are transmitted 38 / 50 Double helical structure of DNA was proposed by: F. Miescher P.A. Levene Walther Fleming Watson and Crick 39 / 50 Vegetative propagation does not involve: Flower parts Leaf parts Root parts Stem parts 40 / 50 Which of the following traits is not sex-linked recessive? tfm syndrome Haemophilia Hypophosphatemic ricket Colour blindness 41 / 50 The term niche was first proposed by: Charles Eton Joseph Grinnell Hardy Weinberg Ernst Haeckel 42 / 50 The interstitial cells are found: lining the wall of vas deferens within the wall of epididymis in the seminiferous tubules of the testes between the seminiferous tubules 43 / 50 The three primary soil macronutrients are: Boron, zinc and manganese Carbon, oxygen and water Copper, cadmium and carbon Potassium, phosphorus and nitrogen 44 / 50 Which one of the following structures is haploid? Primary spermatocytes Sertoli cells Secondary spermatocytes Spermatogonia 45 / 50 Ethene All of the choices are correct Triggers ripening of fruit Promotes leaf abscission Initiates flowering 46 / 50 Which of the following is a phase of mitosis? G0 S phase Prophase Interphase 47 / 50 Cell death: Klinefelter’s syndrome Turner’s syndrome Mitosis Necrosis 48 / 50 Planaria has: None of the above Differentiated cells for regeneration Special cells for regeneration Undifferentiated cells for regeneration 49 / 50 Human chromosomes have how many nucleotides? 140 million 40 million 10 1000 50 / 50 Turner’s syndrome Rapid division Diplotene Missing X Cell cleavage Your score is 0% Restart quiz
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