All are correct
Mangroves in India account for about five per cent of the world’s mangrove vegetation and are spread over an area of about 4,500 km2 along the coastal States/Uts of the country. Sunderbans in West Bengal accounts for a little less than half of the total area under mangroves in India. The Forest Survey of India has been assessing the vegetation cover of the country, including mangroves using remote sensing since 1983. It published its first assessment of mangroves of India in 1987 and estimated it to be 4,046 km². Thereafter, mangroves have been assessed regularly on a two-year cycle. West Bengal has the maximum mangrove cover in the country, followed by Gujarat and Andaman & Nicobar Islands. Mangroves mapping was done in 2005, utilizing their unique reflectance characteristics. In the assessment, mangrove cover has also been categorized into very dense mangrove (canopy density of more than 70 per cent), moderately dense mangrove (canopy density between 40-70 per cent) and open mangrove (canopy density between 10-40 per cent). The current assessment shows that the mangrove cover in the country is 4,445 km2, which is 0.14 per cent of the country’s total geographic area. The very dense mangrove comprises 1,147 km2 (25.8 per cent of mangrove cover), moderately dense mangrove is 1,629 km2 (36.6 per cent) while open mangrove covers an area of l, 669 km2 (37.6 per cent). All statements are correct in this question.

January to March
The term Asian Brown Cloud was coined by leaders of INDOEX to describe the brown haze occurring during the period January to March, over the South Asian region and the tropical Indian Ocean, Arabian Sea and Bay of Bengal. This wintertime haze appears brown, when seen from an aircraft, because of the substantial contribution by man-made particles such as soot. The haze has been described as a ‘blanket of pollution’ in the news release, because ‘the discovery during INDOEX of the so-called South Asian haze is a clear evidence of the magnitude of the aerosol pollution problem’ (UNEP report, p. 2). It is not clear why, after describing what was observed during INDOEX as haze, it was decided to call it a cloud. The word ‘cloud’ may have been used to suggest that it is much denser than a haze. Perhaps the name ‘Asian Brown Cloud’ was chosen to give an impression of the Asian region choking under a thick and permanent blanket of dirty atmosphere. (Current Science)

Only 1 is correct
The First statement is correct . After the North East states, Madhya Pradesh and Chhattisgarh account for maximum Bamboo production area and stock in India. The second statement is incorrect. Maximum usage is in scaffolding. (source: ministry documents)

None of them is correct
“Green Bridge Technology (GBT) was in news when the Ministry launched the “in situ” biorememedation of Buddha Nala of Ludhiana last year. Please note the Bioremediation can be either in situ or ex situ. In in situ remediation, consortia of microbes are used in the water resource itself such as nala, river, pond etc. In ex situ bioremediation involves removal of waste materials and their collection at a place to facilitate microbial degradation. In the recent project at Buddha Nala , SERI used the green bridge’ technology that uses ecological process to absorb pollutants to restore the nullah. In this technology, Green Bridges, which are temporary barricades filled with microbes are erected at a distance of around 1 km from each other. As the water passes thru the successive green bridges, the Biological Oxygen Demand and Chemical Oxygen Demand get reduced greatly. The technology has shown a reduction in pollution level in the nullah to 70 per cent.

Both 1 & 2 are correct
The Ministry of Environment & Forests has released the CRZ Notification, 2011 which has now replaced the CRZ Notification, 1991. Apart from that, the Island Protection Zone Notification, 2011 has been notified for the first time covering the Andaman and Nicobar Islands and Lakshadweep.
Objectives:
1.Protection of livelihoods of traditional fisher folk communities
2.Preservation of coastal ecology
3.Promotion of economic activity that have necessarily to be located in coastal regions.
Background:
The CRZ Notification 1991 has been amended for 25 times up till now and among the new features, it includes Goa, Kerala, Greater Mumbai and critically vulnerable coastal areas (CVCAs) like Sunderban Mangrove Area, Chilka and Bhitarkanika (Orissa), Gulf of Khambat and Gulf of Kutchh (Gujarat), Malwan (Maharashtra), Karwar and Kundapur (Karnataka), Vembanad (Kerala), Coringa, East Godavari and Krishna Delta (Andhra Pardesh), Gulf of Mannar (Tamil Nadu).
What is the limit of the CRZ Area?
CRZ area now includes the water area up to 12 nautical miles in the sea and the entire water area of a tidal water body such as creek, river, estuary, etc.
Does the above area impose any restriction on Fishing activities?
No, it does not impose any restrictions of fishing activities.
What is CZMP?
The CRZ notification 2011 enshrines that concept of a Coastal Zone Management Plan (CZMP). It will be prepared with the fullest involvement and
participation of local communities.
What is the definition of the No development Zone?
The “no development zone” definition has been changed. It is reduced from 200 metres from the high-tide line to 100 meters only. This has been done to
meet increased demands of housing of fishing and other traditional coastal communities.
What is proposed enactment to protect the traditional rights of the Fishermen?
As per recommendation of the expert committee headed by Dr. M.S. Swaminathan, that Government should enact a law to protect the traditional rights and interests of fishermen and coastal communities, is under proposal. This law would be somewhat along the lines of the Forest Rights Act, 2006. Fishermen associations have supported this recommendation. The MoE&F has already prepared such a draft law in this regard and put it in the public domain for comments and suggestions.
What about the demand for Coastal Zone Regulation law?
There has been a demand from fishermen associations that instead of having a Notification under Environment Protection Act, 1986, Government should enact a coastal zone regulation law to be passed by Parliament. This is because a notification does provide considerable flexibility to the Executive. The ministry acknowledges and appreciates that a law passed by Parliament will enhance public confidence and trust that amendments are introduced after adequate debate and
Why CRZ Notification is so important?
India has a long coastline of 7,500km, ranging from Gujarat to West Bengal, and two island archipelagos (Andaman Island and Lakshadweep). Our coastal ecosystems provide protection from natural disasters such as floods and tsunamis to the 250 million people who live in our coastal areas. Coastal waters provide a source of primary livelihood to 7 million households. Our marine ecosystems are a treasure trove of biodiversity, which we are only beginning to discover and catalogue. Thus our coastline is both a precious natural resource and an important economic asset, and we need a robust progressive framework to regulate our coast.

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