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