Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

Give Diagrammatic representation of recombinant DNA Technology.

Give the chromosomal constitution and the resulting sex in each of the following syndromes:
Turner’s syndrome.

Name the ancestors of man based on the features given below:

1. Human-like meat eater with 900cc brain, lived in Java.
2. More human with brain size 1400cc, lived in Central Asia, used hides and buried their dead.
3. Human-like, vegetarian, with brain capacity between 650cc and 800cc.
4. Man-like primate, that existed about 15 mya. Fossils found in Tanzania.

During the secondary treatment of the primary effluent how does the significant decrease in BOD occur?

OR

During the secondary treatment of the primary effluent how does the significant decrease in BOD occur?

Arrange the following primates in correct sequence of evolution to man-

1. Dryopithecus.
2. Australopithecus.
3. Homo erectus.
4. Homo habilis.
5. Homo sapiens.
6. Cro-Magnon man.
7. Ramapithecus.

Why do we experience shivering during winters when the temperature is very low?

Luteal phase of the menstrual cycle is also called the secretory phase. Give reason.

Name the three layers of uterine wall.

During a monohybrid cross involving a tall pea plant with a dwarf pea plant, the offspring populations were tall and dwarf in equal ratio. Work out a cross to show how it is possible.

Prior to industrialisation, there were far more white winged moths on trees than melanised moths in England. However, after industrialisation, the distribution pattern of these two kinds of moths reversed what does the above observation indicate? Explain giving reasons.