The first stable product of CO2 fixation in sorghum is:
AI-generated explanation. Check against your textbook.
Explanation:
In sorghum (a C4 plant), carbon dioxide is fixed by the enzyme PEP carboxylase to form oxaloacetic acid (oxaloacetate) in mesophyll cells. This is the first stable product of CO2 fixation. Oxaloacetate is then converted to malate and transported to bundle-sheath cells for decarboxylation and the Calvin cycle. Hence, the correct option is 2: Oxaloacetic acid.
🧠 Did You Know?
In C3 plants, the first stable product of CO2 fixation is 3-phosphoglyceric acid (3-PGA), not oxaloacetate.
💡 NCERT Memory Line:
In C4 plants, CO2 is fixed by PEP carboxylase to form oxaloacetate (oxaloacetate → malate), the first stable CO2 fixation product.
AI-generated explanation. Check against your textbook.
Explanation:
Chara (a freshwater alga) is monoecious in NCERT terms because it bears both male (antheridia) and female (oogonia) sex organs on the same plant. This means one individual can produce both male and female gametes, fulfilling the monoecious condition.
🧠 Did You Know?
In higher plants, monoecious species have separate male and female flowers on the same individual, while dioecious species have male and female flowers on separate individuals.
💡 NCERT Memory Line:
Monoecious = same plant bears both male and female sex organs (antheridia and oogonia present).
The term used for transfer of pollen grains from
anthers of one plant to stigma of a different plant
which, during pollination, brings genetically different types of pollen grains to stigma, is :