The number of substrate level phosphorylations
in one turn of citric acid cycle is:
AI-generated explanation. Check against your textbook.
Explanation:
In one turn of the citric acid cycle, substrate-level phosphorylation occurs once. Succinyl-CoA synthetase converts succinyl-CoA to succinate and produces one GTP (or ATP, depending on the organism). Thus, the number of substrate-level phosphorylations per cycle is one. Options Zero, Two, or Three do not match this NCERT-stated observation.
🧠 Did You Know?
Only one molecule of GTP/ATP is formed per cycle by substrate-level phosphorylation; the rest of the cycle’s energy is captured in NADH and FADH2 during redox reactions.
💡 NCERT Memory Line:
In one turn of the TCA cycle, one substrate-level phosphorylation yields one GTP (ATP) molecule.
Which of the following is incorrect for wind-pollinated plants?
AI-generated explanation. Check against your textbook.
Explanation:
The incorrect statement is option 2. NCERT explains that wind-pollinated flowers are not showy, with small flowers, exposed stamens, and a feathery stigma to catch pollen. They produce large amounts of light, smooth pollen (non-sticky) and pollen is wind-dispersed. The number of ovules is not emphasized as a characteristic feature in wind pollination; typically, these plants do not rely on visual attraction for pollination, so having many ovules per ovary is not a defining trait highlighted in NCERT for wind-pollinated plants.
🧠 Did You Know?
Wind-pollinated flowers are usually inconspicuous and lack nectar, unlike many insect-pollinated flowers.
💡 NCERT Memory Line:
Wind-pollinated flowers: exposed stamens, feathery stigma, small and dull flowers, pollen light and non-sticky.