Organisms and Populations — BIOLOGY STD 12 Science — Question

Which forest is named as the ‘Lungs of the Planet’?

Arrange the following terms in correct stages of development-megaspore tetrad, megaspore mother cell, nucellar cells, functional megaspore.

Give an example where animal-plant interaction involves co-evolution.

Name two sexually transmitted diseases caused by bacteria.

OR

Name two curable STDs.

A bisexual flower that never opens, is called _______.

“Pranay suffered from measles at the age of 10 years. There are rare chances of his getting infected with the same disease for the rest of his life.” Give reason for the statement.

Under which circumstances, the emergency contraceptives are proved to be effective?

Name the unlabelled areas ‘a’ and ‘b’ of the pie chart (given above) representing the global biodiversity of invertebrates showing their proportionate number of species of major taxa.

Write the percentage of the pea plants that would be homozygous recessive in the F, generation, when tall F, heterozygous pea plants are selfed.

In what way is monocyte a cellular barrier with reference to immunity?