CBSE Class 10 Science Objective type Questions & Answers
51 The dramatic changes in body features associated with puberty are mainly because of the secretions of:
Answer: Testosterone from testes and estrogen from ovary
53 Which of the following control and regulate the life process?
Answer: Nervous and endocrine systems
54 Which of the following controls the involuntary actions in the body?
Answer: Medulla in hindbrain
59 The disposal of wastes produced in a nuclear power plant is a big problem because it is:
Answer: Highly radioactive