The enzyme that breaks down starch into maltose in the mouth is:
A. Salivary amylase
B. Pepsin
C. Rennin
D. Lipase
Answer: Option A
Solution (By JKSSB Mock Tests)
Salivary amylase (ptyalin) initiates starch digestion in the mouth, hydrolyzing it into maltose and dextrins. Pepsin digests protein, lipase fats, rennin curdles milk. Amylase works optimally at neutral pH.
Explanation:
Self-pollination (autogamy) occurs within the same flower. Geitonogamy is pollination between different flowers of the same plant, functionally cross-pollination. Xenogamy is between different plants. Self-pollination leads to genetic uniformity.
Explanation:
The Cell Theory, one of the fundamental principles of biology, was proposed by Matthias Schleiden (a German botanist) in 1838 and Theodor Schwann (a British zoologist) in 1839. Schleiden concluded that all plants are composed of cells, and Schwann extended this to animals. Rudolf Virchow later added the third tenet in 1855: 'Omnis cellula e cellula' (all cells arise from pre-existing cells).
Explanation:
Catalase is found in peroxisomes and protects cells from oxidative damage by converting H₂O₂ (a toxic byproduct) into water and oxygen. Peroxidase also acts on peroxides but catalase is highly efficient. Amylase acts on starch, lipase on lipids. Liver and RBCs have high catalase activity.
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