Practice free Excretory Products and Their Elimination (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What is the primary excretory substance eliminated by the lungs in significant quantities daily?
The NCERT states, 'Our lungs remove large amounts of CO$_2$ (approximately 200mL/minute) and also significant quantities of water every day.'
Which of the following substances are secreted by the liver and ultimately pass out with digestive wastes?
According to the NCERT, 'Liver, the largest gland in our body, secretes bile-containing substances like bilirubin, biliverdin, cholesterol, degraded steroid hormones, vitamins and drugs. Most of these substances ultimately pass out alongwith digestive wastes.'
What is the primary function of sweat produced by the sweat glands?
The NCERT explicitly states, 'Though the primary function of sweat is to facilitate a cooling effect on the body surface, it also helps in the removal of some of the wastes mentioned above.'
Which of these components is present in sweat?
The NCERT mentions, 'Sweat produced by the sweat glands is a watery fluid containing NaCl, small amounts of urea, lactic acid, etc.'
Sebaceous glands eliminate which of the following substances through sebum?
As per the NCERT, 'Sebaceous glands eliminate certain substances like sterols, hydrocarbons and waxes through sebum.'
The oily covering provided by sebum on the skin has what primary role?
The NCERT states, 'This secretion provides a protective oily covering for the skin.'
How much carbon dioxide is removed by the lungs per minute approximately?
The NCERT text specifies, 'Our lungs remove large amounts of CO$_2$ (approximately 200mL/minute) and also significant quantities of water every day.'
Which of the following describes the role of the liver in excretion related to nitrogenous wastes for ureotelic animals?
The NCERT states, 'Ammonia produced by metabolism is converted into urea in the liver of these animals and released into the blood which is filtered and excreted out by the kidneys.' This highlights the role of the liver in converting ammonia to urea for excretion in ureotelic animals.
Which of the following substances, if present in liver secretions, contributes to the color of feces?
Bilirubin and biliverdin are bile pigments produced from the breakdown of hemoglobin, and their excretion via bile gives feces its characteristic brown color. The NCERT mentions, 'Liver...secretes bile-containing substances like bilirubin, biliverdin...Most of these substances ultimately pass out alongwith digestive wastes.'
Apart from excretory waste, sweat also contains small amounts of:
The NCERT states, 'Sweat produced by the sweat glands is a watery fluid containing NaCl, small amounts of urea, lactic acid, etc.'
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