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Yanka [14]
3 years ago
15

Selective herbicides are only able to kill specific types of plants and often leave some weeds in the field to continue to grow.

Why would a farmer choose to use a selective herbicide?
Biology
2 answers:
Norma-Jean [14]3 years ago
8 0
Because they dont want to kill the grass or the plants that they want. but only to kill the plants its meant for 
Solnce55 [7]3 years ago
3 0

Answer & Explanation:

Suppose you are working as a farmer, and you want to grow corn - it's the only crop you want to grow. Of course, you'd have to make sure there isn't anything else staying with that corn, right? But why? There are many reasons as to why a farmer would choose to use a selective herbicide. One is that it reduces competition. Plant species living in the same area and using the same resources are going to compete for those resources; hence, no matter how much water you give to your corn, if there's something else using it, then your preferred crops aren't going to get enough of it. This may also determine the quality of your corn, and the amount of yield it provides. Sometimes, you might also want to get rid of annoying plants that get into your way of harvest as well. Killing a certain plant species also ensures that you have enough space for your preferred crop, as well as guaranteeing that unwanted plants won't disperse their seeds around the area and take up more space in the future.

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2. Imagine that you are in a building and the fire alarm goes off. All of the doors around you lock shut, and you smell smoke.
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The main problem that your central nervous system will try to solve is how to get out of this place.

<h3>B. What is the somatic nervous system probably doing?</h3>

It is releasing stimuli so that the pupil dilates and the blood goes to the muscles, to give greater physical vigor.

<h3>ç. Which part of the autonomic nervous system is likely to be active and what is it doing?</h3>

The autonomic nervous system is a part of the nervous system that functions independently of will and consists of neurons that conduct impulses from the central nervous system (brain and/or spinal cord) to the glands, smooth muscle and heart muscle.

<h3>What are the physiological responses of adrenaline binding in the sympathetic autonomic system?</h3>

Adrenaline increases the overall activity of the heart, increasing both the heart rate and the force of contraction. The heart has β1 receptors in both contractile and specialized myocardium. When turning on, a series of cardiac effects can happen.

With this information, we can conclude that the main problem that your central nervous system will try to solve is how to get out of this place.

Learn more about central nervous  in brainly.com/question/17520523

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4 0
1 year ago
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Answer:

Explanation:The seasons are caused as the Earth, tilted on its axis, travels in a loop around the Sun each year. Summer happens in the hemisphere tilted towards the Sun, and winter happens in the hemisphere tilted away from the Sun.

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2 years ago
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