Which scientist thought he proved that plants obtain nutrients from water rather than soil?
✓ van Helmont
COMPLETE
Which scientist demonstrated that the green parts of plants absorb carbon dioxide and release oxygen
only in sunlight?
DONE
Which scientist showed that plants use red and blue light in photosynthesis?
DONE

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.

What’s the question here ?