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Sever21 [200]
3 years ago
11

Explain why the formation of abscission layer causes sugar to accumulate in leaves.

Biology
1 answer:
kramer3 years ago
3 0
Abscission layer is the layer of cutinized parenchyma cells that develops in the abscission zone. The abscission zone form across the base of the plant part, where the break eventually occurs. During the photosyntesis chlorophyll using sunlight produces sugar and storches which are used as food by plant. And sugar accumulate in leaves.   
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What are the dated fossils called that help scientists to identify or date rocks or fossils?
mamaluj [8]

Answer:

Index fossils

Explanation:

The index fossils are the fossils that come in very handy for the geologists when it comes to identifying or dating rock samples or other fossils. The reason for this is that the index fossils have already been dated. They are fossils that are very commonly found, wide dispersed, are easy to be identified, and are limited to only a certain geological period. These characteristics make them an excellent indicator for the dating of the rock layers in which they are found, or the fossils found in the same layers with them, without conducting further examinations.

5 0
3 years ago
Interneurons receiving input from sensory neurons are located in the ________.
alisha [4.7K]

Answer:

Dorsal horn

Explanation:

The sensory neurons cell bodies are present in dorsal horns. The front side of spinal cord consist of two arms of it. The ventral horn is the centrally located grey matter with motor neurons cell bodies.

The dorsal horns are located at each spinal cord levels that are four in number. The sensory nuclei is present in dorsal horns that perceive somatosensory information. The information is then transferred to midbrain and diencephalon. Thus, Interneurons receiving input from sensory neurons are located in the dorsal horn.

4 0
3 years ago
What air pollutants causes a reddish-brown haze in the sky?
Mars2501 [29]

Answer: Nitrogen dioxide

Explanation:

7 0
3 years ago
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sp2606 [1]

Answer:

According to the image shown, the country that most closely resembles the population pyramid by age is the United States (option A).

Explanation:

The population pyramid consists of a bar chart that groups the population by age and sex. Each sex is separated into two columns, while from the base to the top the ages are grouped from lowest to highest.

The pyramid by age shown in the image corresponds to a developed country, such as the United States, since the distribution of the population of infants and young people is proportional, being more acute in the advanced ages, acquiring the shape of a bottle.

The "bottle" shape of the population pyramid indicates a controlled birth rate, as well as good availability of basic and sanitary resources, characteristic of a developed country like the United States.

The other options are not correct because:

<em>     C and D. In developing countries such as </em><u><em>Nigeria and Ethiopia</em></u><em>, the birth rate is high - forming a broad base - and the resources available are limited, so there is a progressive decrease as the age groups are distributed, giving a true pyramid shape. </em>

<em>     B. </em><u><em>Italy</em></u><em>, a European country, has a tendency to rhomboidal population pyramids. This is due to a predominance of adult, young and mature, population, low birth rate, good basic and sanitary resources.</em>

6 0
3 years ago
What is letter A in the DNA model??
sergeinik [125]

Answer:

adenine (A), cytosine (C), guanine (G), and thymine (T),

Explanation:

8 0
2 years ago
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