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 phototropism hydrotropism geotropism 2. The substance that triggers the fall of mature leaves and fruits from plants is due to. auxin gibberellin abscisic acid cytokinin 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 Nerve impulse travels from dendritic end towards axonal end 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 4. Involuntary actions in the body are controlled by medulla in hind brain medulla in spinal cord medulla in mid brain medulla in fore brain 5. Which of the following is not an involuntary action? Heart beat Salivation Chewing Vomiting 6. When a person is suffering from severe cold, he or she cannot differentiate the smell of a perfume from that of an agarbatti differentiate a hot object from a cold object differentiate the taste of an apple from that of an ice cream differentiate red light from green light 7. Which statement is not true about thyroxin? Thyroxin is also called thyroid hormone It regulates carbohydrates, protein and fat metabolism in the body Thyroid gland requires iodine to synthesise thyroxin Iron is essential for the synthesis of thyroxin 8. Dwarfism results due to Less secretion of adrenaline Excess secretion of growth hormone Excess secretion of thyroxin 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 estrogen from adrenal gland and testosterone from pituitary gland testosterone from testes and estrogen from ovary 10. A doctor advised a person to take an injection of insulin because his blood pressure was low his heart was beating slowly his sugar level in blood was high he was suffering from goitre 11. The hormone which increases the fertility in males is called growth hormone oestrogen testosterone insulin 12. Which of the following endocrine glands is unpaired? Pituitary Ovary Testes Adrenal 13. Junction between two neurons is called cell junction synapse neuro muscular junction neural joint 14. In humans, the life processes are controlled and regulated by nervous and endocrine systems reproductive and endocrine systems respiratory and nervous systems endocrine and digestive systems 15. The centre of sense of smell in the brain is midbrain olfactory lobe cerebellum cerebrum 16. Which body organ is surrounded by meninges spinal cord and lungs brain and heart brain and spinal cord hear ansd lun 17. Layer covering spinal cord is plasma membrane meninges pericardium pleural membrane 18. The cells in our body that can be over a foot long are _____. Nerve cells Muscle cells Blood cells Bone cells 19. Gibberellins were discovered from algae mosses fungi bacteria 20. Which of the following controls riding a bicycle? Medulla Cerebrum Pons Cerebellum 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
