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Ask QuestionPosted by Shaurya Thakur ?? 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Evidences of evolution:
Some of the important sources which provide evidences for evolution are:
(a) Analogous Organs: Organs which performs similar function but are different in structure and origin.
Example - wings of a bird and wings of an insect.
The presence of analogous organs indicates that even the organisms having organs with different structures can adapt to perform similar functions for their survival under hostile environmental conditions. Thus, the presence of analogous organs in different animals provide evidence for evolution by telling us that though they are not derived from common ancestors, they can still evolve to perform similar functions to survive, flourish and keep on evolving in the prevailing environment.
(b) Homologous Organ: Organs which have different functions but similar structure and origin.
Example - fore arm of frog, lizard, bird and human.
The presence of homologous organs in different animals provides evidence for evolution by telling us that they are derived from the same ancestor who had the 'basic design' of the organ on which all the homologous organs are based.
(c) Fossils: The remains of dead animals or plants that lived in the remote past are known as fossils. The fossils provide evidence of evolution. For example, a fossil bird called Archaeopteryx looks like a bird but it has many features which are found in reptiles. This is because Archaeopteryx has feathered wings like those of birds but teeth and tail like those of reptiles. Therefore, Archaeopteryx is a connecting link between the reptiles and birds and suggests that birds have evolved from reptiles. Thus, fossils provide evidence that the present plants and animals have originated from the previously existing ones through the process of continuous evolution.
Posted by Gauri Shankar Shah Shah 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
The prevention of pregnancy in women (by preventing fertilisation) is called contraception. There are four methods of contraception:
- Barrier method: In barrier method of contraception, the physical devices such as condoms are used by males and females.
- Chemical method: In chemical methods of preventing pregnancy, the females use two types of pills – oral pills and vaginal pills.
- Intra-Uterine Contraceptive Devices – The use of intra-uterine contraceptive devices like Copper-T is very effective in preventing pregnancy. A Copper-T is placed inside the uterus by a doctor to prevent unwanted pregnancies.
- Surgical method: These methods are available for males as well as for females. Vasectomy is done in males and tubectomy is done in females.
Posted by Harsh Verma 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
The rapid, automatic response to a stimulus which is not under the voluntary action of the brain is called reflex action.
Reflex arc is the neural pathway that mediates a reflex action.
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Shaurya Thakur ?? 5 years, 8 months ago
Meghna Thapar 5 years, 8 months ago
Functions of blood:
(i) It carries oxygen from the lungs to different parts of the body.
(ii) It carries carbon dioxide from the body cells to the lungs for breathing out.
(iii) It carries digested food from the small intestine to all the parts of the body.
(iv) It carries waste product called urea from the liver to the kidneys for excretion in the form of urine.
(v) It protects the body from diseases.
The functions of lymph are:
(i) It takes part in the nutritive process of the body.
(ii) It protects the body by killing the germs drained out of the body tissues with the help of lymphocytes contained in the lymph nodes, by making antibodies.
(iii) It helps in removing the waste products like fragments of dead cells etc.
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Posted by Naveen Kumar 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
A gender role, also known as a *** role, is a social role encompassing a range of behaviors. There is ongoing debate as to what extent gender roles and their variations are ... In a third study, 14 male children born with cloacal exstrophy and assigned female at birth, including through intersex medical interventions.
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An autosome is any chromosome that is not a *** chromosome (an allosome). However, an allosome is a *** chromosome that differs from an ordinary autosome in form, size, and behavior.
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Amir Rahmani 5 years, 8 months ago
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