The percentage of argon in the atmosphere is:? December 29, 2019 BILAL KHATTAK0 A.About 1% B.0.35% C.0.90%D.3%undefined
Relative to shoots, the roots can be very massive in plants of:? December 26, 2019 BILAL KHATTAK0 A.Deserts B.Lakes and ponds C.Mixed temperate forestsD.Mixed tropical forestsundefined
Flowering is induced if germinating seeds are exposed to:? December 25, 2019 BILAL KHATTAK0 A.Low temperature B.High Temperature C.Temperature below freezingD.Temperature above 45 degree Cundefined
Hydrophytes usually have:? December 25, 2019 BILAL KHATTAK0 A.Well developed stomata B.Well developed aerenchyma C.Well developed root systemD.Well developed vascular systemundefined
Largest amount of fresh water on our planet is contained:? December 22, 2019 BILAL KHATTAK0 A.In lakes and streams B.In rivers C.UndergroundD.On polar ice and glaciersundefined
The L- and H-layers are differentiated in:? December 21, 2019 BILAL KHATTAK0 A.Mull B.Mor C.PeatD.Muckundefined
Among the plants listed, point out one that does not fit into biological group represented by other plants? December 19, 2019 BILAL KHATTAK0 A.Euphorbia B.Acacia C.VallisneriaD.Aloeundefined
The rock cover of the earth is called:? December 19, 2019 BILAL KHATTAK0 A.Lithosphere B.Xerosphere C.PasmmosphereD.Pedosphereundefined
Excessive aerenchyma is characteristic of:? December 18, 2019 BILAL KHATTAK0 A.Hydrophytes B.Xerophytes C.MesophytesD.Heliophytesundefined
In submerged hydrophytes, which of the following is present?? December 17, 2019 BILAL KHATTAK0 A.Air spaces B.Cuticle C.Well developed sclerenchymaD.Well developed vascular tissuesundefined