The amnion of mammalian embryo is derived from
ectoderm and mesoderm
endoderm and mesoderm
ectoderm and endoderm
mesoderm and trophoblast
A.
ectoderm and mesoderm
The extraembryonic or foetal membranes are amnion, chorion, allantois and Yolk sac.
Amnion is formed from mesoderm on the outer side and ectoderm on the inner side.
Chorion is formed from trophoectoderm and mesoderm whereas allantois and Yolk sac membrane have mesoderm on outer side and endoderm in the inner side.
Alexander Von Humbolt described for the first time
Ecological Biodiversity
Laws of limiting factor
Species area relationships
Species area relationships
How does pruning help in making the hedge dense?
It induces the differentiation of new shoots from the rootstock
It frees axillary buds from apical dominance
The apical shoot grows faster after pruning
The apical shoot grows faster after pruning
In a growing population of a country,
pre-reproductive individuals are more than the reproductive individuals
reproductive individuals are less than the post-reproductive individuals.
pre-reproductive individuals are less than the reproductive individuals.
reproductive and pre-reproductive individuals are equal in number.
Niche overlap indicates
active cooperation between two species
two different parasites on the same host
sharing of one or more resources between the two species
sharing of one or more resources between the two species
Annual migration does not occur in the case of
salmon
siberian crane
salamander
salamander
Asymptote in a logistic growth curve is obtained when
The value of 'r' approaches zero
K = N
K > N
K > N
A high density of elephant population in an area can result in
Mutualism
Intraspecific competition
Interspecific competition
Interspecific competition
Praying mentis is a good example of
Mullerian mimicry
Warning colouration
Social insects
Social insects
