VEDANTU NEET BIOTONIC JEE MATH

2021-05-03 06:32:12 QUIZ OF THE DAY ओपन / कमेंट

2021-05-02 08:31:09 QUIZ OF THE DAY ओपन / कमेंट

2021-05-02 06:49:33 SOME TERMS RELATED TO EVOLUTION

Adaptation:

Changing to fit a niche or survive in an environment

Anatomy:

Study of the structures of organisms

Artificial Selection:

Characteristics selected by humans

Biogeography:

Study of how species are distributed across the Earth

Biological Species:

Individuals that can interbreed and produce viable offspring

Catastrophism:

Changes in species that happen because of quick and often violent natural phenomena

Cladistics:

Method of classifying species in groups based on ancestral relationships

Cladogram:

Diagram of how species are related

Coevolution:

One species changing in response to changes in another species that it interacts with, particularly predator/prey relationships

Creationism:

Belief that a higher power created all life

Darwinism:

Term commonly used as a synonym for evolution

Descent With Modification:

Passing down traits that might change over time

Directional Selection:

Type of natural selection in which an extreme characteristic is favored


Disruptive Selection:

Type of natural selection that favors both extremes and selects against the average characteristics

Embryology:

Study of the earliest stages of development of an organism

Endosymbiotic Theory:

Currently accepted theory as to how cells evolved

Eukaryote:

Organism made of cells that have membrane-bound organelles

Evolution:

Change in populations over time

Fossil Record:

All known traces of past life ever found

Fundamental Niche:

All available roles an individual can play in an ecosystem

Genetics:

Study of traits and how they are passed down from generation to generation

Gradualism:

Changes in species that happen over long periods of time

Habitat:

Area in which an organism lives

Homologous Structures:

Body parts on different species that are similar and most likely evolved from a common ancestor

Hydrothermal Vents:

Very hot areas in the ocean where primitive life might have begun

Intelligent Design:

Belief that a higher power created life and its changes

Macroevolution:

Changes in populations at the species level, including ancestral relationships

Mass Extinction:

Event in which large numbers of species died out completely

Microevolution:

Changes in species at a molecular or gene level.....

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2021-05-01 17:54:51 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 ओपन / कमेंट

2021-05-01 06:43:25 Parathyroid gland

(1) Hormones of parathyroid: Active hormone secreted by parathyroids is parathormone (PTH), also called Collip's Hormone (Phillips collip, 1925).

(2) Irregularities of parathormones

(a) Hypoparathyroidism (Hyposecretion of parathormone)

(b) Hyperparathyroidism (Hypersecretion of parathormone)

Pancreas
(1) Hormones of pancreas and their role:

(a) Insulin: Insulin regulates how the body uses and stores glucose and fat.

(b) Glucagon: This is secreted by the alpha cells of islets of Langerhans. Its function is to elevate glucose level in blood when glucose is deficient.

(c) Somatostatin and Pancreatic polypeptide: Modern physiologists have postulated that the d and F (PP) cells of pancreas respectively secrete somatostatin (SS) and pancreatic polypeptide (PP). Somatostatin resembles the growth hormone inhibitory hormone (GHIH) secreted by hypothalamus.

Thymus gland
(1) Function of thymus glands

(a) Thymus is haemopoietic, as well as, an endocrine gland.

(b) The major function of thymus is to secrete thymosin hormone, thymic humoral factor (THF), thymic factor (TF), thymopoietin.

(c) Thymus is essential in neonatal (newly born) infant and postnatal child for normal development of lymphoid organs and cellular immunity.

Gonads
(1) The gonads are the sex glands, the testes and the ovary.

(i) Testes
The testis form part of the male reproductive system, and is the gland where sperm and testosterone are produced.

Functions of Testes

(a) It stimulates the male reproductive system to grow to full size and become functional.

(b) It stimulates the formation of sperms (spermatogenesis) in the seminiferous tubules.

(c) It also determines the male sexual behaviour sex urge, aggressive behaviour.

(d) Under its effect protein anabolism increases.
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2021-04-29 17:48:01 ओपन / कमेंट

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