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