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