Statement 1: All cells arise from pre-existing cells. Statement 2: All cells have a cell wall.
Options:
A .  
Both the statements are correct.
B .  
Only statement 1 is correct.
C .  
Only statement 2 is correct.
D .  
Both the statements are incorrect.
Answer: Option B : B The cell theory was proposed by Matthias Schleiden (1838) and Theodor Schwann (1839), after studying plants and animal cells independently. It states that:
All living organisms are made up of cells.
Cells are the smallest units in a living organism that can perform all the functions of life.
Rudolf Virchow in 1858 said "Omnis cellula-e-cellula", which means that all cells arise from the pre-existing cells only.
Cell wall is a rigid outer layer which is present in bacterial, fungal and plant cells, but not present in animal cells.
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