NEET Test 59

As the frequency of visible light increases refractive index increases. With the increase of refractive index critical angle decreases. So that light having the frequency greater than green will get total internal reflection and the light having the frequency less than green will pass to air.

So the spectrum of visible light whose frequency is less than that of green light will come out to the air medium is the correct 

With addition of sucrose there is a relative lowering of vapour pressure. 
Hence, probable vapour pressure is less than that of pure water. 
37 kPa is the correct answer.

• The first movements of the fetus and appearance of hair on the head are usually observed during thefifth month.
• Muscles differentiate, embryo capable of movement and gonads are distinguishable as testis or ovary during 2^nd month of pregnancy.
• Face begins to look human, lobes of cerebrum differentiates during 4^th month of pregnancy.
• Limbs buds appear, and three vesicles of brain are formed during 4^th week of pregnancy.

• Tertiary treatment is a physicochemical process in which wastewater is used for domestic purpose.
• In this process chlorine gas, ozone gas, zirconium, perchlorate salts, U.V. rays or reverse osmosis etc., are used to remove DDT, pesticides, pathogens, and turbidity in wastewater.
• Methane, carbon di oxide and hydrogen sulphide forms the biogas which are produced during anaerobic sludge digesters during secondary treatment.

• G₂ phase is also Gap₂ phase which is the second gap phase present between S and M phase.
• The following events take place during this phase-

(a) Mitochondria, Chloroplast and Golgi bodies duplicate in this phase. 
(b) Synthesis of tubulin protein takes place. 
(c) DNA synthesis stops but cell synthesize RNA, proteins etc. 
(d) Mitotic division in animals can only be seen in diploid somatic cells. 
(e) Mitotic division in plants can be seen in both haploid and diploid cells. 

• G₁ phase is the interval between mitosis and initiation of DNA.
• In G₀ phase the cell remains metabolically active but do not proliferate unless they are called on to do so.
• S phase in which synthesis and duplication of DNA take place.