Biodiversity And Conservation Class 12 Pdf

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20.05.2021 at 07:49
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biodiversity and conservation class 12 pdf

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Biodiversity and Conservation Class 12 Notes are prepared in a systematic manner which gets rid of confusion among children regarding the course content since CBSE keeps on updating the course every year. The Notes cover all topics which provides the students a simple way to study of revise the chapter.

Biology is a critical skill that inculcates logical reasoning and out-of-the-box analytical abilities. Studying Biology will enable you to get much better at abstract reasoning.

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Ans: Three components of biodiversity are: a Genetic diversity b Species diversity c Ecological diversity. How do ecologists estimate the total number of species present in the world? Ans: Ecologists estimate the total number of species present in the world by comparing species richness of some exhaustively studied groups between any two regions tropics, temperate or polar regions.

Species richness, as a measure of diversity, has been used by many ecologists. Species abundance and species proportional abundance based indices are some other alternative approaches to the measurement of diversity. Ans: 1 The tropical area have a more stable climate than temperate zones. Local species continues to live in absence of natural disturbances. What is the significance of the slope of regression in a species-area relationship? Ans: Slope of regression or regression coefficient makes it easier to measure species richness along an area.

For a limited area like, a country, it gives a constant value of 0. It remains amazingly similar for all those small regions. On the contrary, for measuring species-area relationship over large areas like the entire continents, the slope of regression values in the range of 0. What are the major causes of species losses in a geographical region? Ans: Species are lost in a geographical region due to natural disturbances like forest fires; famine, drought and also due to human disturbance with over replantation, habitat destruction, habitat displacement, over specialization, intensive agriculture and pollution.

How is biodiversity important for ecosystem functioning? Ans: Biodiversity is important for ecosystem functioning because, 1 It contributes to productivity. All organisms are linked in food chains and interact with their abiotic environment in such a way so as to keep the natural cycles going and make the ecosystems self — sustaining units.

Disappearance of any link in a food chain will not affect the ecosystem as other alternatives are there. What are sacred groves? What is their role in conservation? Ans: Sacred forests or sacred groves are forest patches around places of worship which are held in high esteem by tribal communities. They are the most undisturbed forest patches which are often surrounded by highly degraded landscapes. They are found in several parts of India, e. Temples built by tribals are found surrounded by deodar forests in Kumaon region, Jaintias and Khasjas in Meghalaya.

Not a single branch is allowed to be cut from these forests. As a result many endemic species which are rare or have become extinct elsewhere can be seen to flourish here. Bishnois of Rajasthan protect Prosopis cineraria and Black Buck religiously.

Some water bodies are also held sacred in certain places, e. Their aquatic flora and fauna are naturally preserved. Among the ecosystem services are control of floods and soil erosion. How is this achieved by the biotic components of the ecosystem? Ans: Ecosystem services are products or benefits given by ecosystem processes to the environment for its purification, beauty, biodiversity, protection of natural resources, habitat to wild life and tribals, protection of soils, CO 2 — O 2 balance, retention of water against floods, drought and pollution.

Plants play a vital role in the control of floods and soil erosion. Their roots bind the soil Roots of plants also make the soil porous and allow water to go into the soil. The species diversity of plants 22 per cent is much less than that of animals 72 per cent.

What could be the explanations to how animals achieved greater diversification? Most animals possess simple or complex nervous system to control and coordinate various activities. They possess receptors to receive against them. Most of their responses are adaptive and ensure their survival in changing environmental conditions.

They, therefore, have evolved to reveal much higher species diversity than plants who do not possess nervous system and respond differently against environment stimuli. Can you think of a situation where we deliberately want to make a species extinct? How would you justify it? Ans: Humans can cause extinction of species through various means. We are trying to eradicate disease causing organisms e.

Since such micro-organisms are harmful to the human society, such attempt is justified. Further, such micro-organisms are not essential components producers or decomposers of any ecosystem, and losing one or few such organisms would not affect the functioning of ecosystem. Ans: Three components of biodiversity are: a Genetic diversity b Species diversity c Ecological diversity 2.

RD Sharma Class 12 Solutions. Watch Youtube Videos.

NCERT Solutions for Class 12 Biology Chapter 15

Join the discussion Forum to ask your questions and reply to the other users. Tropical latitudes have remained relatively undisturbed for millions of years and thus had a long evolutionary time for species diversification. Tropical environments are less seasonal, relatively more constant and predictable which promote niche specialisation and lead to greater species diversity. There is more solar energy available in the tropics, which contributes to higher productivity and indirectly leads to greater biological diversity. Genetic diversity: Diversity in the number and types of genes, as well as chromosomes present in different species and the variations in the genes and their alleles in the same species.

Download revision notes for Biodiversity and Conservation class 12 Notes and score high in exams. These are the Biodiversity and Conservation class 12 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter 15 in minutes. Revision notes in exam days is one of the best tips recommended by teachers during exam days. Biodiversity or biological diversity is the occurrence of different types of ecosystems, different species of organisms and their variant like biotypes, ecotypes and gene adapted to different climates and environments of different regions including their interactions and processes.

Biodiversity. Biodiversity Conservation. makes our country one of the 12 mega diversity countries of the world. Nearly 45, species of.

Biodiversity and Conservation Class 12 Notes

Please also refer to the NCERT solutions for Class 12 Biology to understand the answers of the exercise questions given at the end of this chapter. How did this diversification come about? Would it function any differently if the diversity was much less? How do humans benefit from the diversity of life?

NCERT Class 12 Biology Biodiversity and Conservation

Biodiversity is the variety of different forms of life on earth, including the different plants, animals, microorganisms , the genes they contain and the ecosystem they form. To maintain life-supporting systems and essential ecological processes.

NCERT Solutions for Class 12 Biology Chapter 15

Ему захотелось увидеть ее глаза, он надеялся найти в них избавление. Но в них была только смерть. Смерть ее веры в. Любовь и честь были забыты. Мечта, которой он жил все эти годы, умерла. Он никогда не получит Сьюзан Флетчер.

 Ты сошла с ума! - крикнул в ответ Хейл.  - Я вовсе не Северная Дакота! - И он отчаянно забился на полу. - Не лги, - рассердилась Сьюзан.  - Почему же вся переписка Северной Дакоты оказалась в твоем компьютере.

Biodiversity and Conservation class 12 Notes Biology


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