The structure that provides buoyancy to aquatic plants is:
A. Sclerenchyma
B. Xylem
C. Aerenchyma
D. Collenchyma
Answer: Option C
Solution (By JKSSB Mock Tests)
Aerenchyma is a specialized parenchyma tissue with large intercellular air spaces, providing buoyancy and facilitating gas exchange in aquatic plants. It also helps in oxygen transport to submerged roots. Sclerenchyma is supportive, collenchyma flexible support, xylem water-conducting.
Consider statements about human respiration: 1. Hemoglobin has a higher affinity for CO2 than O2. 2. Carbonic anhydrase is present in RBCs. 3. Most CO2 is transported as bicarbonate. Which are correct?
Explanation:
Hemoglobin has a much higher affinity for oxygen than for carbon dioxide; it binds O2 readily in the lungs. Inside RBCs, the enzyme carbonic anhydrase rapidly catalyzes the conversion of CO2 and water into carbonic acid. Approximately 70% of CO2 is transported in the blood as bicarbonate ions in the plasma. Thus, statements 2 and 3 are correct.
Explanation:
The glomerulus is a tuft of fenestrated capillaries enclosed by the Bowman's capsule in the renal corpuscle. Blood is filtered under high pressure through the capillary walls into the Bowman's space. The filtrate then passes into the nephron tubules. Glomerular filtration is the first step in urine formation.
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