- AWheat
- BGram
- CMustard
- DPaddy
Explanation:
Blue-green algae or cyanobacteria are photoautotrophic, prokaryotic algae. They are free living nitrogen fixing microorganism. It fixes the atmospheric nitrogen in moist soils. So, BGA has been recommended as a biofertilizer for paddy field.
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$(1)$ They have dark colour and high rate of reproduction and excrete solid urine.
$(2)$ They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.
$(3)$ They feed on dry seeds and do not require drinking water.
$(4)$ They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true ?

$(a)$ Euchromatin is loosely packed chromatin
$(b)$ Heterochromatin is transcriptionally active
$(c)$ Histone octomer is wrapped by negatively charged DNA in nucleosome
$(d)$ Histones are rich in lysine and arginine
$(e)$ A typical nucleosome contains $400\,bp$ of DNA helix
Choose the correct answer from the options given below: