Free Net Life Science Study Materials

CSIR JRF NET Life Sciences June 2015 Solved Original Question Paper with Answer Key (PDF)


Official / Original Previous Year (Old) Solved Question Paper of CSIR Junior Research Fellowship (JRF) and National Eligibility Test (NET) Life Sciences (XL) Examination June 2015  with Answer Key and Explanations as PDF. CSIR aspirants can download the question paper as single PDF file for your exam preparation. Please feel free to inform us for any mistakes in the answer key provided. To download the question paper as single PDF file, please click on the download button below.

Download All Previous Year NET Solved Papers: NET Life Science Old Papers (Solved - PDF - Download)

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Notification of CSIR JRF NET, Life Science Examination

ICMR JRF Exam (Life Sciences) Notification 2016: Apply Online


ICMR JRF Model Questions: Life Science

Indian Council of Medical Research (ICMR)
Ramalingaswami Bhawan,
Ansari Nagar, Post Box 4911, New Delhi-110029

ICMR in collaboration with PGIMER, Chandigarh will hold national level examination for award of Junior Research Fellowship (JRF) in Life science/Social science stream on Sunday, July 17, 2016 at Bhopal, Bhubaneswar, Chandigarh, Chennai, Delhi, Kolkata, Mumbai, Hyderabad, Guwahati, Srinagar (J&K), Bengaluru and Varanasi. Information bulletin/brochure, online application form and other details will be available at PGIMER Website http://pgimer.edu.in and ICMR New Delhi website: www.icmr.nic.in. Candidates wish to apply should visit the websites w.e.f. 09.04.2016. The last date for filling of online application is 09.05.2016. Only online application will be accepted, no other mode of submission of application will be accepted.

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Free Net Life Science Study Materials

CSIR JRF NET Life Sciences December 2015 Original Solved Question Paper with Answer Key as PDF


Official / Original Previous Year (Old) Solved Question Paper of CSIR Junior Research Fellowship (JRF) and National Eligibility Test (NET) Life Sciences (XL) Examination December 2015  with Answer Key and Explanations as PDF. CSIR aspirants can download the question paper as single PDF file for your exam preparation. Please feel free to inform us for any mistakes in the answer key provided.

Download All Previous Year NET Solved Papers: NET Life Science Old Papers (Solved - PDF - Download)

To download the question paper as a single PDF file, please click on the link below.




To download the question paper, please click on the link below

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Ecology Lecture Notes

Biological Interactions: Positive and Negative Interactions in an Ecosystem (.PPT)


ecological interactions

Organisms living together in a community influence each other directly or indirectly under natural conditions. All the vital process of living such as growth, nutrition and reproduction requires such interactions between individuals in the same species (intraspecific) or between species (interspecific) These inter or intra relationships of individuals in a population or community of an ecosystem is called biological interactions or population interactions. The interaction between organisms may not be always beneficial to all the interacting counter parts. Based on whether, the interaction is beneficial to both interacting species or harmful to at least one interaction species, the ecological of biological interactions are classified into two categories.

(I).   Positive interactions

(II). Negative interactions

(I). Positive interactions:

In positive interactions, the interacting populations help one another. The positive interaction may be in one way or reciprocal. The benefit may be in respect of food, shelter, substratum or transportation. The positive association may be continuous, transitory, obligate or facultative. The two interacting partners may be in close contact in such a way that the tissues intermixed with each other; or they may live within a specific area of the other; or attached to its surface.  Different types of positive population interactions are:

(1). Mutualism

(2). Commensalism

(3). Proto-cooperation

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