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