Question 1 (1 point) Which of the following is considered to be a plant behavior

Question

Question 1 (1 point)

Which of the following is considered to be a plant behavior?

Question 1 options:

Response to sunlight.

Response to shade.

Response to touch.

Response to gravity.

All of the choices are correct.

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Question 2 (1 point)

Plant hormones bind to specific cellular receptor molecules that trigger changes in gene expression. Which statement is correct concerning plant responses to hormones?

Question 2 options:

Only cells lacking receptors can respond to these hormones.

Only cells expressing appropriate receptors can bind the hormone.

Only cells in the apical meristem can bind these hormones.

All cells can bind these hormones whether they contain receptors or not.

None of these choices is correct.

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Question 3 (1 point)

Phototropism is a plant response controlled largely by which color of light?

Question 3 options:

Red.

Blue.

Violet.

Green.

None of the choices is correct.

Question 4 (1 point)

Roots contain starch-filled plastids known as

Question 4 options:

chloroplasts.

plastoplasts.

chromoplasts.

statoliths.

otoliths.

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Question 5 (1 point)

Plant roots that are in a horizontal position grow down because

Question 5 options:

cells on the upper side elongate more than those on the lower side.

auxins inhibit cell elongation on the lower side of the root.

statoliths are being affected by gravity.

All of the statements about root growth are correct.

None of the above are correct.

Response to sunlight.

Response to shade.

Response to touch.

Response to gravity.

All of the choices are correct.

Explanation / Answer

Question 1-Which of the following is considered to be a plant behavior?

Answer-All of the choices are correct

Description-All options can be considered as plant behaviiour.

Q.2 -Plant hormones bind to specific cellular receptor molecules that trigger changes in gene expression. Which statement is correct concerning plant responses to hormones?

Answer-Only cells expressing appropriate receptors can bind the hormone

Description-Receptors come in closely matched pairs, with a receptor recognizing just one specific ligands, and a ligand binding to just one target receptors. Binding of a ligand to a receptor changes its shape or activity, allowing it to transmit a signal or directly produce a change inside of the cell. Cell surface receptors are receptors that are embedded in the membranes of cells. They act in cell signaling by receiving extracellular molecules. They are specialized integral membrane proteins that allow communication between the cell and the extracellular space. The extracellular molecules may be hormones, neurotransmitters, cytokines, growth factors, cell adhesion molecules, or nutrients; they react with the receptor to induce changes in the metabolism and activity of a cell.

Question 3-Phototropism is a plant response controlled largely by which color of light?

Answer- Blue

Description-Phototropism is the growth in responds to a light. It is most often observed in plants and rearely in fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs

Phototropism in plants is directed by blue light receptors called phototropins. Other photosensitive receptors in plants include phytochromes that sense red light and cryptochromes that sense blue light. Different organs of the plant may exhibit different phototropic reactions to different wavelengths of light. Stem tips exhibit positive phototropic reactions to blue light, while root tips exhibit negative phototropic reactions to blue light.

Question 4-Roots contain starch-filled plastids known as

Answer-chromoplasts

Description-Chromoplasts are colored plastids found in roots, leaves, flowers and ripe fruits. They contain lipid-soluble pigments, referred to as carotenoids, that provide color to many different types of plants and flowers.Plastids produce and store pigment in the cells of plants and algae. They consist of chromoplasts, chloroplasts and leucoplasts.

Question 5-Plant roots that are in a horizontal position grow down because

Answer-All of the statements about root growth are correct.

Description-Gravitropism (geotropism) is a turning or growth movement by a plant or fungus in response to gravity.All above statements about root growth arre correct.

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