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