Plant Structure
The mitochondria were known in the nineteenth century to be osmotically active on the basis of evidence that

the mitochondrial matrix is hypertonic to the cellular cytoplasm
the mitochondrial matrix is hypotonic to the cellular cytoplasm
mitochondria are surrounded by a semi permeable membrane
mitochondria were derived from a symbiotic bacterium

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Plant Structure
Which is not true about a photon?

It is a packet of light energy
It donates electron to reduce carbon dioxide to glucose
The shorter the wavelength, the greater the energy of the photons
It is trapped by photosynthetic unit

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Plant Structure
Which of the following observations is not used as evidence to support the concept of endosymbiotic origin of chloroplasts and mitochondria?

Both strongly resemble prokaryotes, especially in size
Both can live and function independently of the cell
Both have their own DNA
Both have their own ribosomes

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