Which enzyme hydrolyzes starch into maltose in the human digestive system?
A. Pepsin
B. Trypsin
C. Lipase
D. Salivary amylase
Answer: Option D
Solution (By JKSSB Mock Tests)
Salivary amylase (ptyalin) is secreted by salivary glands and begins starch digestion in the mouth, hydrolyzing starch into maltose and dextrins. It works optimally at neutral to slightly alkaline pH. Pancreatic amylase continues starch digestion in the small intestine. Pepsin digests proteins, trypsin digests proteins in the intestine, and lipase digests fats. Salivary amylase action stops in the acidic stomach.
Explanation:
Decomposition involves several steps. Leaching is the process where water-soluble inorganic nutrients (like nitrates, phosphates) are washed out of the decomposing organic matter (detritus) and move deep into the soil profile, where they may become unavailable to plants. Fragmentation is the breakdown of detritus by detritivores (like earthworms).
Explanation:
Protista consists of unicellular eukaryotes like protozoans, unicellular algae, and slime molds. Monera includes prokaryotes, Fungi are mostly multicellular eukaryotes (except yeast), Plantae are multicellular autotrophs.
Explanation:
Fibrous root systems consist of a dense network of thin, branching roots originating from the stem base, typical of monocots like grasses. Taproot system has a main central root (dicots). Adventitious roots arise from stems or leaves, prop roots are supportive. Fibrous roots are effective in preventing soil erosion.
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