The process by which the embryo attaches to the uterine wall is:
A. Ovulation
B. Implantation
C. Menstruation
D. Fertilization
Answer: Option B
Solution (By JKExamLibrary)
Implantation occurs about 6-7 days after fertilization, when the blastocyst embeds into the endometrium. Fertilization is sperm-egg fusion, ovulation egg release, menstruation shedding.
Consider the following statements about photosynthesis:
1. C3 plants fix CO₂ directly in the Calvin cycle.
2. C4 plants have Kranz anatomy.
3. Photorespiration is higher in C4 plants.
Which of the above is/are correct?
Explanation:
C3 plants use Calvin cycle directly; C4 plants have Kranz anatomy and a CO₂-concentrating mechanism. Photorespiration is negligible in C4 plants, higher in C3. Thus, 3 is incorrect.
Explanation:
Viruses are non-living outside a host cell and must hijack a host's cellular machinery to replicate, making them obligate intracellular parasites. They contain either DNA or RNA, not both (except some rare cases). They lack cell walls and metabolic machinery. Their status as living or non-living is debated, but they are biologically active only inside a host.
Explanation:
Streptomycin is produced by Streptomyces griseus, a soil actinobacterium. Penicillium is a mold producing penicillin, Bacillus species produce some antibiotics like bacitracin, Aspergillus produces other substances.
No comments yet. Be the first to start the discussion!