Test-MCQ Class 10-NCERT -Science-Chapter 7-Test-3 Chapter 7: Control and Coordination Multiple Choice Questions No of Questions : 20 Marks: 20 Please enter your email: 1. The movement of sunflower in accordance with the path of sun is due to chemotropism geotropism hydrotropism phototropism 2. The substance that triggers the fall of mature leaves and fruits from plants is due to. abscisic acid cytokinin auxin gibberellin 3. Which of the following statements about transmission of nerve impulse is incorrect? A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron Nerve impulse travels from dendritic end towards axonal end 4. Involuntary actions in the body are controlled by medulla in mid brain medulla in spinal cord medulla in fore brain medulla in hind brain 5. Which of the following is not an involuntary action? Salivation Vomiting Chewing Heart beat 6. When a person is suffering from severe cold, he or she cannot differentiate red light from green light differentiate the smell of a perfume from that of an agarbatti differentiate the taste of an apple from that of an ice cream differentiate a hot object from a cold object 7. Which statement is not true about thyroxin? Thyroxin is also called thyroid hormone Thyroid gland requires iodine to synthesise thyroxin Iron is essential for the synthesis of thyroxin It regulates carbohydrates, protein and fat metabolism in the body 8. Dwarfism results due to Less secretion of adrenaline Excess secretion of thyroxin Excess secretion of growth hormone Less secretion of growth hormone 9. Dramatic changes of body features associated with puberty are mainly because of secretion of testosterone from thyroid gland and estrogen from pituitary gland oestrogen from testes and testosterone from ovary testosterone from testes and estrogen from ovary estrogen from adrenal gland and testosterone from pituitary gland 10. A doctor advised a person to take an injection of insulin because his blood pressure was low his heart was beating slowly he was suffering from goitre his sugar level in blood was high 11. The hormone which increases the fertility in males is called testosterone growth hormone insulin oestrogen 12. Which of the following endocrine glands is unpaired? Pituitary Testes Ovary Adrenal 13. Junction between two neurons is called neural joint cell junction neuro muscular junction synapse 14. In humans, the life processes are controlled and regulated by nervous and endocrine systems reproductive and endocrine systems endocrine and digestive systems respiratory and nervous systems 15. The centre of sense of smell in the brain is midbrain cerebellum cerebrum olfactory lobe 16. Which body organ is surrounded by meninges spinal cord and lungs brain and spinal cord brain and heart hear ansd lun 17. Layer covering spinal cord is pericardium pleural membrane meninges plasma membrane 18. The cells in our body that can be over a foot long are _____. Bone cells Muscle cells Nerve cells Blood cells 19. Gibberellins were discovered from algae bacteria mosses fungi 20. Which of the following controls riding a bicycle? Pons Cerebellum Medulla Cerebrum Please Enter Your Name, School Name & Class in the given below box and submit: ( results will be shown after submit, within few moments on same the page ) Loading … Question 1 of 21
