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 hydrotropism phototropism geotropism 2. The substance that triggers the fall of mature leaves and fruits from plants is due to. cytokinin auxin gibberellin abscisic acid 3. Which of the following statements about transmission of nerve impulse is incorrect? Nerve impulse travels from dendritic end towards axonal end 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 A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells 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 fore brain medulla in mid brain medulla in spinal cord medulla in hind brain 5. Which of the following is not an involuntary action? Chewing Vomiting Salivation Heart beat 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 Iron is essential for the synthesis of thyroxin Thyroid gland requires iodine to synthesise thyroxin 8. Dwarfism results due to Excess secretion of thyroxin Less secretion of growth hormone Excess secretion of growth hormone Less secretion of adrenaline 9. Dramatic changes of body features associated with puberty are mainly because of secretion of oestrogen from testes and testosterone from ovary estrogen from adrenal gland and testosterone from pituitary gland testosterone from testes and estrogen from ovary testosterone from thyroid gland and estrogen from pituitary gland 10. A doctor advised a person to take an injection of insulin because his sugar level in blood was high he was suffering from goitre his blood pressure was low his heart was beating slowly 11. The hormone which increases the fertility in males is called insulin growth hormone testosterone oestrogen 12. Which of the following endocrine glands is unpaired? Adrenal Pituitary Testes Ovary 13. Junction between two neurons is called synapse cell junction neuro muscular junction neural joint 14. In humans, the life processes are controlled and regulated by endocrine and digestive systems reproductive and endocrine systems respiratory and nervous systems nervous and endocrine systems 15. The centre of sense of smell in the brain is midbrain olfactory lobe cerebrum cerebellum 16. Which body organ is surrounded by meninges spinal cord and lungs hear ansd lun brain and heart brain and spinal cord 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 _____. Bone cells Muscle cells Blood cells Nerve cells 19. Gibberellins were discovered from fungi bacteria algae mosses 20. Which of the following controls riding a bicycle? Cerebellum Pons 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
