metabolic wastes are excreted from plants and animals

Question 1

How are metabolic wastes excreted in humans through the lungs

Answer 1

Carbon dioxide is a waste product of aerobic respiration

Removed by exhalation from the lungs

Question 2

What role does the skin play in excretion?

Answer 2

Sweat glands in the skin excrete water, salts, and urea

Helps in cooling the body and removing minor wastes

Question 3

How does the urinary system excrete wastes?

Answer 3

The kidneys filter the blood to remove urea, water, and salts

Waste is passed out as urine through ureters, bladder, and urethra

Question 4

How do plants excrete wastes through leaf fall

Answer 4

Wastes like tannins and calcium oxalate crystals are stored in leaves

When leaves fall, these wastes are removed from the plant

Question 5

What is the role of bark loss in plant excretion?

Answer 5

Plants store some wastes in bark

As bark peels off, the wastes are excreted from the plant body

Question 6

How do plants store wastes internally?

Answer 6

Some wastes (e.g., resins, latex, tannins) are stored in vacuoles or in dead tissues

These are either harmless or eventually removed by natural shedding