Consider statements about ecology: 1. A population consists of individuals of the same species. 2. A community consists of interacting populations. 3. An ecosystem consists of biotic and abiotic components. Which are correct? MCQ with Answer and Explanation
Consider statements about ecology: 1. A population consists of individuals of the same species. 2. A community consists of interacting populations. 3. An ecosystem consists of biotic and abiotic components. Which are correct?
A. 1 and 2 only
B. 1, 2 and 3
C. 2 and 3 only
D. 1 and 3 only
Answer: Option B
Solution (By JKExamLibrary)
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:
Southern blotting involves separation of DNA fragments by gel electrophoresis, transfer to a membrane, and hybridization with a labeled probe. PCR amplifies DNA, ELISA detects proteins, flow cytometry analyzes cells.
Explanation:
Synapsis (pairing of homologous chromosomes) and crossing over (exchange of genetic material) occur during prophase I of meiosis, not in mitosis. Mitosis involves one division producing two genetically identical diploid daughter cells. Meiosis involves two divisions producing four haploid gametes with genetic variation. Chromosome duplication and sister chromatid separation occur in both. Spindle fibres form in both divisions. Thus, synapsis and crossing over are unique to meiosis.
Explanation:
Iodine solution (iodine in potassium iodide) gives a blue-black color with starch due to the formation of a polyiodide chain complex with amylose. Benedict's tests for reducing sugars, Biuret for proteins, Sudan III for lipids. The iodine test is specific and sensitive for starch.
No comments yet. Be the first to start the discussion!