In primary ecological succession on a bare rock (xerarch), the first organisms to colonize the rock are typically: MCQ with Answer and Explanation

Explanation:
Iodine atoms are incorporated into thyroxine (T₄, 4 iodine atoms) and triiodothyronine (T₃, 3 iodine atoms) synthesized by thyroid follicular cells. Iodine deficiency leads to goiter and hypothyroidism. Iron is in hemoglobin, calcium in bones, phosphorus in ATP and bones.

Explanation:
Bile is synthesized by hepatocytes of the liver and stored and concentrated in the gall bladder. It contains bile salts (sodium glycocholate and taurocholate) that emulsify fats, aiding lipase action. Bile also contains bile pigments (bilirubin, biliverdin) from hemoglobin breakdown. Pancreas secretes pancreatic juice with digestive enzymes. Gall bladder only stores bile, doesn't produce it.

Explanation:
Lysosomes contain hydrolytic enzymes that can digest cellular components and even the whole cell if they burst, a process called autolysis. Hence, they are called suicide bags. They also perform autophagy and phagocytosis. Peroxisomes detoxify peroxides, Golgi modifies proteins, ribosomes synthesize proteins. Lysosomes are formed from the Golgi apparatus.