Why is it that reptiles like lizards and snakes are capable of laying eggs as well as performing live births but birds can only lay eggs? As with most biological phenomena the mystery of why birds do not give birth to live young can be explained once again by Darwin and his theory of evolution. As per the norm with evolution this was a matter of life or death‚ survival of the fittest and adapting to changing environments over millions of years and many generations. Viviparity and oviparity. What
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Colonisation and Succession in an Ecosystem 1. Ecosystem is a community of organisms which interact with their non-living environment and function as a unit. 2. Habitat is a natural environment where organisms live. Also provide shelter‚ food‚ living space‚ nesting sites and mates. 3. Species is a group of organisms that look alike and have similar characteristics‚ share the same roles in an ecosystem and are capable of interbreeding to produce fertile offspring. 4. Population is
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Sexual reproduction has been successful among flowering plants and mammals‚ it is brought by the following requirements. Firstly is the transfer of gametes. Sexual reproduction is only made successful when the gametes of the male and female from a pair of parents of different sexes are transferred to meet each other. In mammals‚ the male gamete is transferred to the female body by copulation to meet with the female gamete in the oviduct for successful fertilization. However‚ the ovum is only
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Chayote Chayote (Sechiumedule‚ Cucurbitaceae)‚ a lesser-known member of the gourd family‚ is gaining in popularity and importance as a food crop worldwide. It is unique among cultivated cucurbits by bearing single-seeded fruits and exhibiting vivipary. Chayote‚ adaptable to a wide range of climatic conditions‚ can be grown with relative ease. In addition to its fruits‚ it yields tender shoots for use as vegetable greens‚ vines as ornament for fences or as animal fodder‚ and edible subterranean storage
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Introduction: Mangroves and tidal swamps exist in middle of the road zones between earthbound ranges and oceanic regions. Accordingly‚ they spread along coasts and estuaries (Chmura G. L. (N. D). Mangroves are known for their remarkable natural surroundings‚ as they live in particular conditions where no different sorts of plants can endure as they confront the power of tides alongside the elevated amounts of saltiness (Environment Agency (2014)). In addition‚ the dirt in which they develop is generally
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Midterm #2 is THURS 11/8/12 in lecture EBS 309: bring 100 question scantron & #2 pencil This exam covers material from lectures #9 (9/27/12) through #19 (11/1/12) Remember – you should take an ACTIVE role in studying – test yourself by trying to explain concepts to others or to yourself with no notes. Find a partner or group to study REGULARLY with – it is not pos sible to learn in 1 night! If needed‚ seek help with plenty of time before the test. Lecture #9 (9/27/12): Phytoplankton‚ Picoplankton
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CODE-Y NEET-UG – 2013 TEST PAPER WITH ANSWER (HELD ON SUNDAY 05th MAY‚ 2013) 1. The eye of octopus and eye of cat show different patterns of structure‚ yet they perform similar function. This is an example of : (1) Analogous organs that have evolved due to divergent evolution (2) Homologous organs that have evolved due to convergent evolution (3) Homologous organs that have evolved due to divergent evolution (4) Analogous organs that have evolved due to convergent evolution (4) Select the correct
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* NCERT 1. Reproduction in Organisms INTRODUCTION Biology in essence is the story of life on earth. While individual organisms die without fail‚ species continue to live through millions of years unless threatened by natural or anthropogenic extinction. Reproduction becomes a vital process without which species cannot survive for long. Each individual leaves its progeny by asexual or sexual means. Sexual mode of reproduction enables creation of new variants‚ so that survival advantage is enhanced
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