Consider statements about viruses: 1. They possess both DNA and RNA. 2. They are obligate intracellular parasites. 3. They can be crystallized. Which are correct? MCQ with Answer and Explanation

Explanation:
A population is a group of individuals of the same species living in a specific geographic area and capable of interbreeding. A community comprises all the interacting populations of different species (plants, animals, microbes) living together in a defined area. An ecosystem is a functional unit of nature that encompasses both the biotic (living community) and abiotic (non-living physical environment like soil, water, sunlight) components, interacting as a complex system. All statements are correct.

Explanation:
Ovulation is the process where a mature ovum (secondary oocyte) is released from the Graafian follicle of the ovary, typically around day 14 of the menstrual cycle, triggered by the LH surge. The ovum is captured by the fimbriae of the fallopian tube. Fertilization is fusion with sperm, menstruation is shedding of the uterine lining, implantation is embedding of the blastocyst.

Explanation:
Epilepsy is a neurological disorder marked by recurrent seizures caused by excessive and synchronous neuronal firing. Stroke is from interrupted blood supply, MS is demyelination, meningitis is inflammation of meninges.