The process by which carbon dioxide is transported in the blood mainly as:
A. Carbon monoxide
B. Dissolved in plasma
C. Bicarbonate ions
D. Carbaminohemoglobin
Answer: Option C
Solution (By JKSSB Mock Tests)
About 70% of CO₂ is transported as bicarbonate (HCO₃⁻) ions in plasma. CO₂ reacts with water in RBCs, catalyzed by carbonic anhydrase, to form carbonic acid, which dissociates into H⁺ and HCO₃⁻. The rest is bound to hemoglobin or dissolved. Bicarbonate is the major transport form.
Explanation:
The pineal gland, located in the brain, secretes melatonin, which regulates circadian rhythms and the sleep-wake cycle. Its secretion increases in darkness.
Explanation:
In cymose (definite) inflorescence, the main axis ends in a flower, limiting further growth, and lateral branches develop below it, which also end in flowers. Racemose is indeterminate with apical growth continuing. Spike and umbel are types of racemose. Cymose includes cymes.
Explanation:
Phototropism is the directional growth of a plant in response to light; shoots exhibit positive phototropism (grow towards light), roots negative. Auxin redistribution causes differential growth. Geotropism is gravity response, hydrotropism water, thigmotropism touch. Phototropism optimizes light capture for photosynthesis.
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