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Answers
ANSWER FOR 2
- (1) Every species survives in specific geographical conditons. The requirements of food and habitat is specific for each species. Their reproductive ability and period is also different.
- (2) Therefore, the individuals from one species cannot reproduce with individuals from other species.
- (3) When they are separated by a distance or geographical barriers they are said to be isolated geographically.
- (4) When they cannot reproduce with each other, they are said to be isolated reproductively.
- (5) The ancestor species of both these subspecies may be the same but due to isolation over a very long-time duration, there is genetic variation between the two. Therefore, the isolation leads to speciation.
ANSWER FOR 3
The Krebs cycle starts with pyruvic acid from glycolysis. Each small circle in the diagram represents one carbon atom. For example, citric acid is a six carbon molecule, and OAA (oxaloacetate) is a four carbon molecule. Follow what happens to the carbon atoms as the cycle proceeds.
ANSWER FOR 4
The process of transcription is the formation of the mRNA from the DNA with the help of the enzyme RNA polymerase.
The process of transcription is the formation of the mRNA from the DNA with the help of the enzyme RNA polymerase. Transcription in prokaryotes is carried out in three stages.
The process of transcription is the formation of the mRNA from the DNA with the help of the enzyme RNA polymerase. Transcription in prokaryotes is carried out in three stages. Initiation: In this step, RNA polymerase enzyme along with initiation factor (sigma) binds with DNA sequence at promotor and starts transcription
ANSWER FOR 5
A) Embryological evidence of evolution has been shown in the picture.
A) Embryological evidence of evolution has been shown in the picture.B) Similarities between all embryos in early stages indicates that all those animals may have common ancestor.
C) Vestigial organs, Connecting link, etc.
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