The vitamin that is essential for the normal development of the fetal neural tube is:
A. Vitamin D
B. Vitamin A
C. Vitamin B₉ (folic acid)
D. Vitamin C
Answer: Option C
Solution (By JKSSB Mock Tests)
Folic acid (vitamin B₉) is crucial for DNA synthesis and cell division; its deficiency during early pregnancy increases the risk of neural tube defects like spina bifida. Many countries fortify flour with folic acid. Vitamin A is for vision, C for collagen, D for calcium. Women of childbearing age are advised to take supplements.
Explanation:
Anabaena azollae is a heterocystous cyanobacterium that lives symbiotically in the dorsal leaf cavities of the water fern Azolla. It fixes atmospheric nitrogen, providing a natural nitrogen source for rice paddies when Azolla is used as green manure. Nostoc is free-living or lichen symbiont, Rhizobium and Azotobacter are bacteria.
Explanation:
Euglenoids are unicellular eukaryotic organisms that possess characteristics of both plants (chloroplasts for photosynthesis) and animals (lack of a cell wall and presence of a flagellum for movement). Due to their unique features and unicellular nature, they are classified under the Kingdom Protista.
Explanation:
Mitochondria are membrane-bound organelles present in almost all eukaryotic cells but absent in prokaryotes, which carry out respiration on the plasma membrane or mesosomes. Ribosomes, cell wall (in most), and plasma membrane are present in both.
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