Ecosystems and Energy Flow — BIOLOGY STD 12 Science — Question

Classify the following animals having different respiratory organs given below as per Column ‘A’ and complete Column ‘B’.
Select from the given options:
(i) Scorpion
(ii) Reptiles
(iii) Amphibian tadpoles of frog
(iv) Spiders
(vi) Salamanders
(v) Birds

Column A	Column B
(1) External gills	————
(2) Book lungs	————
(3) Lungs	————

Name the seeds that have retained their viability for thousands of years.

How and why is the bacterium Thermus aquaticus employed in DNA technology? Explain.
Or
Name the source of the DNA polymerase used in PCR technique. Mention why it is used?

Or
Give the name of the organism from where the thermostable DNA polymerase is isolated. State its role in genetic engineering.

It is often observed that the chances of a person suffering from measles in his or her lifetime are low if he or she has suffered from the disease in their early childhood. Justify the statement.

What are the objectives of animal breeding?

Certain molecular processes are given in column (A). Provide the terms given to these processes in column (B), after selecting them from the terms:
Recombination, gene regulation, prokaryotic transcription, eukaryotic transcription, translation, replication, gene transfer, DNA fingerprinting

S.No.	Column A	Column B
(i)	DNA → DNA
(ii)	DNA → hRNA
(iii)	mRNA → Protein
(iv)	Repressor Protein + Operator → No transcription

PCR is a useful tool for early diagnosis of an infectious disease. Comment.

How sheep are genetically altered to produce wool of better quality?

What is short day plant? Give any two examples.

List any two economically important products for human obtained from Apis indica.