chemistry in life

Differentiate between them in terms of the types of plants that are killed by each.

1. Atrazine is a non-selective herbicide, mostly used on weeds in corn fields, which are resistant to it. 2. Glyphosate is a non-selective herbicide that kills all plants, unless they have been genetically modified to resist it.

Is potassium bicarbonate an organic pesticide? Explain. Match the words in the left column to the appropriate blanks in the sentences on the right.

1. It is not is not organic in a chemical sense (no C − C or C − H bonds). organic in a chemical sense (no C−C or C−H bonds). 2. It is not organic in the natural sense; it is a synthetic compound as its synthesis is described above. 3. It can rarely be found in its natural form.

Match the condition of the soil with the respective treatment. Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

1. Sand is added to plants in soil with too much clay. 2. Add mixed fertilizer to plants in nutrient-poor soil. 3. Ammonium nitrate is added to plants in nitrogen-deficient soil. 4. Add limestone if the soil pH is less than 5.5.

If you know how a plant uses a specific nutrient, you can use that information to determine what would happen to a plant deficient in that nutrient. Recognizing why a plant has stunted growth or yellowing leaves can make it easier to target the deficiency and bring the plant back to health. Match the deficiency symptoms in plants with the nutrient required to relieve the symptoms. Match the elements with the effect of deficiency in plants. Make sure each sentence is complete before submitting your answer.

1. Stunted growth in plants is marked by the deficiency of nitrogen or phosphorus . 2. Weak stalk, infected roots, and dead areas are symptoms of potassium deficiency in plants. 3. Deficiency of calcium causes the plant stems to grow twisted or otherwise deformed 4. A deficiency of nitrogen or magnesium causes yellowing that is more prominent in mature, older leaves.

Classify the following characteristics as benefits or drawbacks of organic and synthetic herbicides. Drag the appropriate items to their respective bins.

Benefits of organic herbicide the more eco-friendly option Drawbacks of organic herbicide the more expensive option does not work as quickly Benefits of synthetic herbicide effective in one application Drawbacks of synthetic herbicide persists in the environment more prone to weed resistance

What chemical reaction is used in producing of phosphate fertilizers from phosphate rock and phosphoric acid? Express your answer as a chemical equation.

Ca3(PO4)2+4H3PO4→3Ca(H2PO4)2

Classify the characteristics of pesticides containing DDT and those containing organophosphorus compounds. Drag the appropriate items to their respective bins.

DDT interferes with calcium metabolism pesticidal persistence Organophosphorus compounds less persistent in environment more toxic to mammals Both broad-spectrum pesticide nerve poison

Choose several ways that nitrogen can be fixed. Check all that apply.

Haber process bacteria lightning flash

Classify the following characteristics of the soil as healthy or poor. Drag the appropriate characteristics of the soil into their respective bins.

Healthy soil nutrient rich pH between 5.5 and 7.0 Poor soil pH less than 5.5 high hydronium ion concentration low nitrogen concentration large amount of carbon dioxide

Sort the following elements as macronutrients or micronutrients.

Macronutrients nitrogen, phosphorus, potassium, magnesium, calcium, Micronutrients copper, zinc, manganese,

Indicate whether each of the following pesticides is organic in the chemical sense only, in the sense used in organic farming only, in both senses, or in no way at all. Sort these pesticides into the proper categories.

Organic chemical only malathion Organic farming only boric aciddiatomaceous earth Both chemical and farming rotenone Organic in no sense lead arsenate

Consider energy labor.

Organic farming requires about 12% more labor than conventional farming.

Consider energy requirements.

Organic farming requires about 2.3 times less energy than conventional farming.

What is the role of phosphorus in plant nutrition?

Plants incorporate phosphates into DNA and RNA and other compounds essential to plant growth.

Consider crop yields.

Production of organic farming is 10% lower than that of conventional farming.

The type of plants that an herbicide will control, as well as the mechanism it uses to kill those plants, can be used to determine the ideal situation under which to use an herbicide. Use the information in the transition to sort the herbicides based on the best choice for each scenario. Drag the appropriate items to their respective bins.

Select for broad−leaved weeds while leaving corn crops intact 2, 4-DAtrazine Kill established grassy weeds and vines along a walkway Glyphosate Clear weeds in an orchardof established trees Paraquat

Both organic and synthetic pesticides have carbon-containing compounds and are organic in nature. Here, the term organic refers to the source from which it is obtained. These pesticides differ in the nature of their active ingredient. Classify the following pesticides as synthetic pesticides or organic pesticides. Drag the appropriate items to their respective bins.

Synthetic pesticides DDT Aldicarb (Temik®) Parathion Organic pesticides rotenone ryania pyrethrins

Consider energy profitability.

The energy profitability is similar.

How are juvenile hormones used against insect pests?

They can be synthesized and used to keep insects in the juvenile stage.

Select the two most commonly used compounds in weed-killers.

glyphosate atrazine