What is degraded by Peroxisomes?

The major function of the contractile vacuole is

Which of the following is a Semipermeable Membrane $(SP)$ and which is Selectively Permeable $(SL)$? : Tonoplast

Which of the following is not true about sphaerosomes?

Give scientific reasons: Majority of fresh water organisms have contractile vacuoles while marine organisms lack them.

Given below are some characters of a cell organelle. Identify the correct organelle which shows all the characters described above.
$(i)$ It is a membrane bound space found in the cytoplasm.
$(ii)$ It is bound by a single membrane called tonoplast.
$(iii)$ It contains water,sap,excretory products and other materials not useful to the cell.
$(iv)$ It has higher concentration of sap than the cytoplasm.