The release of a mature egg from the ovary is called:
A. Fertilization
B. Ovulation
C. Menstruation
D. Implantation
Answer: Option B
Solution (By JKExamLibrary)
Ovulation is the process in the female menstrual cycle where a mature ovarian follicle ruptures and discharges an ovum (secondary oocyte) into the fallopian tube, where it can potentially be fertilized. It typically occurs around the 14th day of a 28-day cycle, triggered by a surge in Luteinizing Hormone (LH).
Explanation:
Actin (thin) and myosin (thick) filaments slide past each other during contraction, powered by ATP. Collagen is structural, hemoglobin transports oxygen.
Consider the following statements about the nitrogen cycle:
1. Nitrogen fixation converts N₂ to ammonia.
2. Nitrification converts ammonia to nitrates.
3. Denitrification returns nitrogen to the atmosphere.
Which of the above is/are correct?
Explanation:
All three processes are part of the nitrogen cycle: fixation (N₂ → NH₃), nitrification (NH₃ → NO₂⁻ → NO₃⁻), and denitrification (NO₃⁻ → N₂).
Explanation:
Calvin cycle occurs in the stroma. Chloroplasts are only in plants/algae; thylakoids stack into grana; cristae are in mitochondria; 70S ribosomes are in stroma, not membrane.
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