Ans.
Beads on a string structure shows DNA molecule, which wraps around histone proteins. This structure is known as chromatin. The histone molecules are supposed as beads and DNA molecule represents a string, thus known as beads on string structure.
It plays an important role in DNA packaging as it folds very long molecules of DNA into a dense, compact form that can fit into a small nucleus or cell.
Hence, the correct answer is option d.
They provide other organisms with food. got it from : https://quizlet.com/74022812/topic-test-science-flash-cards/#
Cytokinins are found in sites of active cell division in plants.
Plant root hairs help to absorb carbon dioxide from the soil.
Root hair cells
Plants absorb water from the soil by osmosis. They take up mineral ions by active transport against a concentration gradient. Root hair cells are well-suited for absorbing water and mineral ions because of their large surface area and high absorptive capacity.
It also contains many mitochondria, which release energy from glucose during respiration to provide the energy needed for active transport.
To know more about mitochondria,
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Answer:
Transportation
Explanation:
They can transport substances / nutrients from roots to different parts of the plant which makes the stem important for the plant.
