Answer:
Chloroplasts are not visible in the onion bulb, only in its leaves and stem.
Explanation:
Chloroplast is an organelle found in the cells of green plants, and in photosynthetic algae, where photosynthesis takes place.
Note that onion bulb do lack chloroplasts because the bulb is usually situated under the ground where light cannot penetrate; so it does not need chloroplasts.
However, the green leaves and stem of an onion plant (the shoot system situated above the ground) are normally exposed to daylight and so have chloroplasts for the production of sugars stored in the bulb, but the onion bulb does not.
In spite of all that has been mentioned, onion contains plant cells not animal cells.
<span>Edith probably compensates for the effects of aging on her body by constantly testing her physical limits, cultivating endurance, and maintaining an active lifestyle. Running marathons requires a great deal of endurance training, especially in older age. Such intense physical activity would also get Edith's heart rate up and would help alleviate stress.</span>
Answer:
alpha decay because alpha particles have two protons and two neutrons
Explanation:
An alpha particle has a nucleus which is made up of 2 protons and 2 neutrons. It is actually a Helium cation.
A nuclear reaction involves the nucleus and the elementary particles contained within them.
If an isotope undergoes radioactive decay and the new isotope that forms has an atomic number that is 2 less than the original isotope,it shows an alpha decay has occurred.
The atomic number is the number of protons and it is the same as the number electrons for a neutral atom.
In this isotope, the reaction must have involved loss of two protons from the nucleus. The atomic number comes two less than that original one.
The mass number i.e number of proton + neutron is 4. Therefore, the mass number of the isotope would also decrease by 4.
This is to obey the law of conservation by mass.
The main parts of a nucleotide are the nitrogenous base and sugar-phosphate backbone. A viable nucleotide can't form without them. Thus, they both have equal importance.
