Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?
They were able to reproduce
They could separate combinations of molecules from the surroundings
They were partially isolated from the surroundings
They were partially isolated from the surroundings
D.
They were partially isolated from the surroundings
Homoeostasis is keeping the internal environment of the body constant. It is necessary for normal life processes. Microspheres are molecular aggregates of proteinoids. Oparin and Sydney Fox held that large organic molecules synthesized abiotically on primitive earth formed large colloidal aggregates due to the intermolecular attraction. These colloidal particles were called coacervates. Oparin called giant nucleoprotein poid molecules as protobionts. These reproduce either by budding a binary fission but do not exhibit homoeostasis.
Ascaris is characterised by
the absence of true coelom but the presence of metamerism
the presence of neither true coelom nor metamerism
the presence of true coelom but the absence of metamerism
the presence of true coelom but the absence of metamerism
Consider the following four statement (A-D) about certain desert animals such as kangaroo rat
A) they have a dark colour and high rate of reproduction and excrete solid urine.
B) they do not drink water, breathe at a slow rate of conserve water and have their body covered with thick hairs.
C) they feed on dry seeds and do not require drinking water.
D) they excrete very concentrated urine and do not use water to regulate body temperature.
Which two of above statement for such animals are true?
C and D
B and C
C and A
C and A
Which one of the flowing is the correct percentage of the two (out of the total of 4 ) green-house gases that contribute to the total global warming?
CFC 14%, CH4 20%
CO2 40% CFCs 30%
N2O 6%, CO2 86%
N2O 6%, CO2 86%
World summit on sustainable development (2002) was held in
Brazil
Sweden
Argentina
Argentina
Quercus species are the dominant component in
temperature deciduous forests
alpine forests
scrub forests
tropical rain forests
Given below is a diagrammatic cross section of a single loop of the human cochlea.
diagram
Which one of the following options correctly represents the names of three parts?
C :Endolymph
D : Sensory hair cells
A: Serum
D: Sensory hair cells
A: Endolymph
B: Tectorial membrane
D: Sensory hair cells
A: Endolymph
B: Tectorial membrane