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2021-06-21 10:50:02 Blood is the most important fluid in the body for transporting nutrients and oxygen. Blood is a type of fluid connective tissue. Blood comprises plasma and formed elements. It consists of thrombocytes (platelets), erythrocytes (RBC) and leucocytes (WBC).

1. Which of the following blood cells play an important role in blood clotting?
(a) Thrombocytes
(b) Neutrophils
(c) Leucocytes
(d) Erythrocytes


2. Serum differs from blood as it lacks
(a) antibodies
(b) clotting factors
(c) albumins
(d) globulins


3. Which of the following is correct?
(a) Serum contains blood and fibrinogen
(b) Plasma is blood without lymphocytes
(c) Blood comprises plasma, RBC, WBC and platelets
(d) Lymph is plasma with RBC and WBC


4. This plasma protein is responsible for blood coagulation
(a) Fibrinogen
(b) Globulin
(c) Serum amylase
(d) Albumin


5. DNA is not present in
(a) an enucleated ovum
(b) hair root
(c) a mature spermatozoa
(d) mature RBCs


6. Globulins of the blood plasma are responsible for
(a) defence mechanisms
(b) blood clotting
(c) oxygen transport
(d) osmotic balance


7. Lymph differs from blood in having
(a) no plasma
(b) more RBCs and less WBCs
(c) more WBCs and no RBCs
(d) plasma without proteins


8. WBCs which release heparin and histamine
(a) Basophils
(b) Neutrophils
(c) Monocytes
(d) Eosinophils


9. WBCs which are the most active phagocytic cells
(a) lymphocytes and macrophages
(b) neutrophils and eosinophils
(c) neutrophils and monocytes
(d) eosinophils and lymphocytes


10. Find the correct statement for WBCs
(a) can squeeze through blood capillaries
(b) produced only in the thymus
(c) deficiency leads to cancer
(d) do not contain a nucleus Open / Comment

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2021-06-19 10:34:54 Important Cities and Countries in NCERT

1. Neanderthal man lived in : Near East & Central Asia
2. Homo sapiens Arose in : Africa
3. Erythroxylum coca is native of : South America
4. > 70% live stock population is in : India & China
5. Saccharum barberi grown in : North India
6. Saccharum officinarum grown in : South India
7. IARI : New Delhi
8. IRRI : Phillippines
9. ICWMI : Mexico
10. Taichung Native-I develops from : Taiwan.
11.IR-8 developed from : IRRI, Philippines
12. Borlaug developed semi-dwarf wheat at : ICWMI, Mexico.
13. Jaya & Ratna developed in : India
14. Toddy is used in : South India
15. Penicillin was used during world war-II to treat : American soldiers
16. Eli lily is an : American company.
17. A company which got patent rights on basmati rice : American Company
18. Mango tree do not & can not grow in : Canada & Germany
19. Snow leopard are not found in : Kerela forests
20. High altitude places (>3500 m) : Rohtang pass near Manali & Mansarovar (in China occupied Tibet) Open / Comment

2021-06-18 17:23:01 Short-cut technique for balancing a chemical equation
Example:

aCaCO3 + bH3PO4 → cCa3(PO4)2 + dH2CO3

Set up a series of simultaneous equations, one for each element.

Ca: a=3c

C: a=d

O: 3a+4b=8c+3d

H: 3b=2d

P: b=2c

Let’s set c=1

Then a=3 and

d = a = 3

b = 2c = 2

So a=3; b=2; c=1; d=3

The balanced equation is

3CaCO3 + 2H3PO4 → Ca3 (PO4)2 + 3H2CO3 Open / Comment

2021-06-17 17:34:32 Open / Comment

2021-06-17 17:33:07 Many Congratulations to our
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2021-06-17 16:02:18 Important Paragraph from NCERT(Human Health and Disease)

Paragraph:

Opioids are the drugs, which bind to specific opioid receptors present in our central nervous system and gastrointestinal tract. Heroin (Figure 8.7), commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine (Figure 8.7), which is extracted from the latex of poppy plant Papaver somniferum (Figure 8.8). Generally taken by snorting and injection, heroin is a depressant and slows down body functions. Open / Comment

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2021-06-17 12:05:28 important Paragraph from NCERT(Cell: The Unit of Life)





The smooth muscle fibres taper at both ends (fusiform) and do not show striations (Figure 7.7b). Cell junctions hold them together and they are bundled together in a connective tissue sheath. The wall of internal organs such as the blood vessels, stomach and intestine contains this type of muscle tissue. Smooth muscles are ‘involuntary’ as the
ir functioning cannot be directly controlled. We usually are not able to make it contract merely by thinking about it as we can do with skeletal muscles.
The abdomen in both males and females consists of 10 segments. In females, the 7th sternum is boat shaped and together with the 8th and 9th sterna forms a brood or genital pouch whose anterior part contains female gonopore, spermathecal pores and collateral glands. In males, genital pouch or chamber lies at the hind end of abdomen bounded dorsally by 9th and 10th terga and ventrally by the 9th sternum. It contains dorsal anus, ventral male genital pore and gonapophysis. Males bear a pair of short, threadlike anal styles which are absent in females. In both sexes, the 10th segment bears a pair of jointed filamentous structures called anal cerci. Open / Comment