Glyoxysomes are specialized organelles found primarily in:
A. Fungal spores
B. Mature plant leaves
C. Animal liver cells
D. Germinating oil seeds
Answer: Option D
Solution (By JKSSB Mock Tests)
Glyoxysomes are specialized peroxisomes found in the fat-storing cotyledons of germinating seeds. They contain enzymes for the beta-oxidation of fatty acids and the glyoxylate cycle, which converts stored lipids into carbohydrates (gluconeogenesis) to nourish the growing seedling. This metabolic pathway is absent in animal cells. Exam tip: Glyoxysomes eventually transform into chloroplasts as the plant matures.
Explanation:
The spinal cord is a long tubular bundle of nervous tissue extending from the medulla oblongata to the level of the first/second lumbar vertebra (L1-L2), where it tapers into the conus medullaris. Below this, nerves form the cauda equina. It transmits impulses between the brain and body and coordinates reflexes.
Explanation:
Neisseria meningitidis (meningococcus) causes bacterial meningitis, an inflammation of the meninges. N. gonorrhoeae causes gonorrhea. Pneumonia is often Streptococcus pneumoniae.
Explanation:
Sericulture is the process of rearing silkworms (primarily Bombyx mori) for the production of silk. The silkworm feeds on mulberry leaves (Morus alba) and spins a continuous filament of silk protein (fibroin) to form a cocoon around itself during its pupal stage. The cocoons are then boiled to kill the pupa and unwind the silk filament for textile production.
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