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Which plants give oxygen at night and why so?

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Please find below the solution to the asked query.

Some plants such as peepal, banyan perform a different type of photosynthesis known as crassulacean acid metabolism(CAM). There stomata remain closed during day to prevent the loss of water through transpiration. They take in carbon-dioxide at night and release oxygen but in very less amounts. However, they also release large amounts of oxygen at day time also but do not take CO2 during day.   

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Its not right to say that plants take in oxygen during night as photosynthesis does not take place in night but oxygen is utilized for break down of food to release energy. Thus in night oxygen is not released. Breakdown of food produces carbon dioxide in relatively high quantity which is released in the night.
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Plants uptake Carbon dioxide and release oxygen during the day (photosynthesis) and uptake oxygen and release Carbon dioxide during the night (respiration). Some plants such as Ficus religiosa (Peepal tree) can uptake Carbon dioxide during the night as well because of their ability to perform a type of photosynthesis called Crassulacean Acid Metabolism (CAM).
However, it is not true that they release large amounts of oxygen during the night. CAM is one of the three types of photosynthesis pathways occurring commonly in plants; the other two being C3 and C4 pathways.
Of these, C3 is the most common among land plants. CAM occurs primarily in desert plants and epiphytes (plants that live on other plants, usually large trees). CAM plants do not open their stomata during the day in order to minimise water loss. During the night, they open their stomata and fix Corbon dioxide in the form of malate.During the day, they breakdown the malate and use the released CO2. However, CAM is an energy inefficient reaction and hence plants use CAM only during certain conditions.
Peepal tree is a hemi-epiphyte in its native habitat i.e. the seeds germinate and grow as an epiphyte on other trees and then when the host-tree dies, they establish on the soil. It has been suggested that when they live as epiphyte, they use CAM pathway to produce carbohydrates and when they live on soil, they switch to C3 type photosynthesis.
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