The scientist who first observed chloroplasts was:
A. Antonie van Leeuwenhoek
B. Andreas Schimper
C. Julius von Sachs
D. Robert Hooke
Answer: Option B
Solution (By JKSSB Mock Tests)
Andreas Schimper first described chloroplasts and coined the term in 1883. Hooke discovered cells, Leeuwenhoek observed live cells, Sachs showed starch is produced by photosynthesis.
Consider the following statements about the plant root:
1. Root hairs increase absorption surface area.
2. The root cap protects the root tip.
3. The zone of elongation is responsible for root growth in length.
Which of the above is/are correct?
Explanation:
The colon (large intestine) primarily absorbs water, sodium, and some vitamins (produced by gut flora) from the indigestible food residue, converting it into semisolid feces. It does not secrete digestive enzymes; that is the small intestine's role. Protein digestion and amino acid absorption occur in the small intestine.
Explanation:
Rhizobium species form symbiotic root nodules in legumes and fix atmospheric nitrogen into ammonia. Azotobacter is free-living, Nitrosomonas nitrifies, Lactobacillus ferments.
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