The question asks about the primary function of the thyroid gland. To answer this, recall the major endocrine glands and the hormones they produce, along with their main roles in the body.
Correct Option: C) Secrete thyroxine
The thyroid gland is an endocrine gland that secretes thyroid hormones, primarily thyroxine (\(T_4\)) and triiodothyronine (\(T_3\)). These hormones are vital for regulating the body's metabolic rate, heart and digestive function, muscle control, brain development, and bone maintenance.
The question asks for the definition of a balanced diet. A balanced diet is fundamental for good health and proper bodily function. To answer this, we need to understand what constitutes a complete and healthy intake of food.
Correct Option: C) Meals with all essential nutrients.
A balanced diet is crucial for overall health and well-being. It ensures that the body receives adequate amounts of all macronutrients (carbohydrates, proteins, fats) and micronutrients (vitamins, minerals), along with sufficient water, to function optimally, grow, and repair itself.
The question asks to identify which practice is NOT recommended during menstruation. This requires knowledge of common menstrual hygiene practices and debunking myths associated with menstruation.
Correct Option: D) Avoiding kitchen is not recommended during menstruation. This is a harmful myth with no scientific basis.
The question asks for the primary reason why early marriage is discouraged in India. We need to evaluate each option based on its direct impact and the major public health and social concerns associated with child marriage.
Correct Option: B) To prevent adolescent pregnancy
The question asks about the specific substances released by endocrine glands directly into the bloodstream. Understanding the definition and function of endocrine glands is key to answering this question.
Therefore, endocrine glands release hormones into the bloodstream.
Correct Option: B) Hormones are the chemical messengers secreted by endocrine glands directly into the bloodstream to regulate various bodily functions.
The question asks for the biological term describing the transformation of a tadpole into a frog. This process involves significant physical changes in the organism's life cycle.
C) Metamorphosis — This is the correct term for the biological process where an animal undergoes a complete physical transformation from a larval stage (like a tadpole) to an adult stage (like a frog). It involves significant changes in body structure and physiology.