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Q:

How many years it takes for Pluto to Orbit the Sun?

A) 76 yrs B) 144 yrs
C) 198 yrs D) 248 yrs

Answer:   D) 248 yrs



Explanation:

It takes 248 yrs for Pluto to orbit the Sun.

Subject: General Science
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Q:

The closest algal relatives of land plants are

A) charophytes B) chrysophytes
C) rhodophytes D) bacillariophytes
 
Answer & Explanation Answer: A) charophytes

Explanation:

The charophytes are the extant group of green algae that are most closely related to modern land plants.

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Q:

How do cancer cells differ from normal cells?

Answer

There are many differences between cancer cells and normal cells. Some of the differences are well known, whereas others have only been recently discovered and are less well understood.


cancer_cells_vs_normal_cells1531806964.jpg image


Cancer Cells vs. Normal Cells ::



Below are some of the major differences between normal cells and cancer cells, which in turn account for how malignant tumors grow and respond differently to their surroundings than benign tumors.



Growth :—


Normal cells stop growing (reproducing) when enough cells are present. For example, if cells are being produced to repair a cut in the skin, new cells are no longer produced when there are enough cells present to fill the hole; when the repair work is done. In contrast, cancer cells don’t stop growing when there are enough cells present. This continued growth often results in a tumor (a cluster of cancer cells) being formed. 



Communication :—


Cancer cells don’t interact with other cells as normal cells do. Normal cells respond to signals sent from other nearby cells that say, essentially, “you’ve reached your boundary.” When normal cells “hear” these signals they stop growing. Cancer cells do not respond to these signals.



Stickiness :—


Normal cells secrete substances that make them stick together in a group. Cancer cells fail to make these substances, and can “float away” to locations nearby, or through the bloodstream or system of lymph channels to distant regions in the body.


 


Ability to Metastasize (Spread) :—


Normal cells stay in the area of the body where they belong. For example, lung cells remain in the lungs. Cancer cells, because they lack the adhesion molecules that cause stickiness, are able to travel via the bloodstream and lymphatic system to other regions of the body—they have the ability to metastasize. 


 


Appearance :—


Under a microscope, normal cells and cancer cells may look quite different. In contrast to normal cells, cancer cells often exhibit much more variability in cell size—some are larger than normal and some are smaller than normal. In addition, cancer cells often have an abnormal shape, both of the cell, and of the nucleus (the “brain” of the cell.) 



The rate of growth :—


Normal cells reproduce themselves and then stop when enough cells are present. Cancer cells reproduce rapidly before the cells have had a chance to mature.


 


Maturation :—


Normal cells mature. Cancer cells, because they grow rapidly and divide before cells are fully mature, remain immature. Doctors use the term undifferentiated to describe immature cells (in contrast to differentiated to describe more mature cells.) 


 


Evading the immune system  :—


When normal cells become damaged, the immune system (via cells called lymphocytes) identifies and removes them. Cancer cells are able to evade (trick) the immune system long enough to grow into a tumor by either by escaping detection or by secreting chemicals that inactivate immune cells that come to the scene.


 


Functioning :—


Normal cells perform the function they are meant to perform, whereas cancer cells may not be functional. For example, normal white blood cells help fight off infections. In leukemia, the number of white blood cells may be very high, but since the cancerous white blood cells are not functioning as they should, people can be more at risk for infection even with an elevated white blood cell count.

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0 7
Q:

Blood group compatibility for marriage?

Answer

Matching blood group before marriage is important. This is to prevent Rh incompatibility. Rh incompatibility can lead to erythroblastosis fetalis (Hemolytic disease of the newborn-HDN). Fetal RBC gets destroyed & newborn may get severe anaemia, jaundice. This jaundice is more severe than Physiological jaundice ( which is the most common and will usually resolve on its own).


 


In very severe form, a fetus may die due to heart failure. This is mediated by the antigen-antibodies reaction. Transfer of maternal antibodies across the placenta occurs. This happens when Rh +ve man marries Rh-ve lady.


  


So Rh +ve man should try to avoid marrying Rh-ve lady.


 


Matching blood groups for marriage ::


Boy : A = Girl : A & AB 


Boy : B = Girl : B & AB 


Boy : O = Girl : O, A, B & AB 


Boy : AB = Girl : AB 


Boy : Rh+ve = Girl : Rh+ve 


Boy : Rh-ve = Girl : Rh+ve & Rh-ve.


  


Blood groups that do not match for marriage ::


Boy : A = Girl : O & B 


Boy : B = Girl : O & A 


Boy : AB = Girl : O, A & B 


Boy : Rh+ve = Girl : Rh-ve.

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0 47
Q:

Which of these is a starting point for primary succession?

A) a surface exposed by a retreating glacier B) a neglected yard
C) abandoned farmland D) an abandoned city
 
Answer & Explanation Answer: A) a surface exposed by a retreating glacier

Explanation:

Primary succession is the orderly and predictable series of events through which a stable ecosystem forms in a previously uninhabited region. Primary succession occurs in regions characterized by the absence of soil and living organisms.

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1 120
Q:

What is the primary form of fat in the diet?

A) Lipids B) Fattyacids
C) Triglycerides D) All of the above
 
Answer & Explanation Answer: C) Triglycerides

Explanation:

Triglycerides are the primary form of dietary fat found in the body, and may contain a combination of three fatty acids:

saturated fatty acids (SFAs),

polyunsaturated fatty acids (PUFAs), or

monounsaturated fatty acids (MUFAs).

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0 65
Q:

Which of the following is a chemical property?

A) Reactivity B) Solubility
C) Density D) All of the above
 
Answer & Explanation Answer: A) Reactivity

Explanation:

The ability of two or more substances to combine to form other substances is called Reactivity.

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0 75
Q:

Gases in the atmosphere and their percentages?

Answer

The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smaller amounts of water and other gases.


Earth's atmosphere is composed of many gases. Their percentages by volume is given by::


 
78% Nitrogen,


21% Oxygen,


0.9% Argon, and


0.03% Carbon dioxide 


And very small percentages of other elements.


 

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0 53
Q:

Plants are photoautotrophs. What does this mean?

Answer

Photoautotrophs are those organisms that can make their own food using sun light with the help of the process of photosynthesis.


Plants can prepare their own food using sunlight. Hence they are Photoautotrophs.

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