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Phloem is the tissues which transport food to different plant parts . It's consists of four types of cell - phloem parenchyma , phloem fibres , sieve tubes and companion cells . All cells of phloem are living except phloem fibres . Sieve tubes are elongated multicellular tubular structure which form continuous conducting path for substances various sieve tubes join at ends to form such channel.
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It is estimated that as much as 20% to 40% of Delhi's air pollution originates from Punjab farm fires. During peak burning season, Delhi experienced average PM 2.5 levels of 144 µg/m3 in November and 157 µg/m3 in December, exceeding the WHO's annual exposure guideline by more than 14 times,” the report states.
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