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Agata [3.3K]
3 years ago
12

In some areas forests plant one tree every tree they cut.this activity is an example of

Biology
1 answer:
bulgar [2K]3 years ago
6 0
Sustainable yield is the answer
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Which type of speciation occurred among the Galapagos Islands finches?
Paraphin [41]

allopatric speciation

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4 years ago
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Match the following. 1. the cell that begins the process of cell division telophase 2. the first part of mitosis in which the ch
forsale [732]
Below are the statements matched to their correct term:

1. The cell that begins the process of cell division- PARENT CELL
<span>
2. The first part of mitosis in which the chromosomes shorten and thicken, the nucleolus breaks down, and the nuclear envelope disintegrates - PROPHASE

3. Two rod-like strands replicated by a chromosome during interphase; becomes a daughter chromosome by the end of cell division- SISTER CHROMATIDS 
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4. a system of fibers stretching from one end of a mitotic cell to the other -</span>SPINDLE APPARATUS <span>

5. The phase of mitosis in which the daughter chromosomes have reached opposite ends of the cell, the nuclear envelope and nucleolus reform, and the process of cytokinesis begins - TELOPHASE </span>

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4 years ago
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To participate in a designated driver program and be provided with complimentary nonalcoholic drinks you must meet certain crite
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<span>all of the above 2 there are many ways to consume </span>
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in animal muscular movement is caused due to change in position of proteins how do you think movement will be brought about in t
Colt1911 [192]

<u>Answer:</u>

<em>Movement will be brought about in touch me not plants by the action of various chemicals present at the base of the leaf stalk. </em>

<u>Explanation:</u>

<em>The leaves of touch me not plant stay upright due to turgor pressure. </em>It is exerted by the water present within its cells. This pressure applies force against the cell wall enabling the plant to remain stiff.  

When there is an external disturbance , parts of the plant releases certain chemicals including potassium ions that causes water to diffuse out of cells. <em>This releases the turgor pressure and causes the leaves to shrink.  </em>

7 0
3 years ago
Check all statements that are true about nuclear radiation.
Darya [45]

Answer:

All these are true statements.

Alpha radiation is a helium nucleus.

Beta radiation can be stopped by thick wood or a sheet of aluminum.

electrons are beta radiation.

Alpha radiation is easily stopped by paper or clothing.

Explanation:

Alpha beta and gamma radiations are the examples of ionizing radiations. When an atom is an excited state and having high energy, the atom is in unstable state. The excess of energy is released by the atom to get the stability. The released energy is in the form of radiations which may include alpha, beta, gamma, X-ray etc.

Beta radiations:

Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminium is used to block the beta radiation

⁴₆C → ¹⁴₇N + ⁰₋₁e

The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.

Properties of alpha radiation:

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Gamma radiations:

Gamma radiations are high energy radiations having no mass.

These radiations are travel at the speed of light.

Gamma radiations can penetrate into the many materials.

These radiations are also used to treat the cancer.

Lead is used for the protection  against gamma radiations because of its high molecular density.

The lead apron are used by the person when treated with gamma radiations.

Lead shields are also used in the wall, windows and doors of the room where gamma radiations are treated, in-order to protect the surroundings.

False statements:

Gamma radiation is an electron (false)

Gamma radiation can be stopped by clothing, (False)

Alpha radiation is a high energy electromagnetic wave (False)

Stable and non-stable nuclei can give off radiation. (false)

only unstable nuclei give off radiations to get stability.

8 0
3 years ago
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