Human Reproduction — BIOLOGY STD 12 Science — Question

What percent of all bird species and mammal species, respectively face the threat of extinction?

Differentiate between pollination and fertilization is angiosperms.

Given below is an equation describing the Species-Area relationship between species richness and area for a wide variety of taxa as angiosperm plants, birds, bats etc.
S = CA^Z
a. Give a graphical representation of the given equation showing Species-Area relationship.
b. What does S represent in the given equation?
c. What is the value of Z (regression coefficient) for frugivorous birds and mammals in the tropical forests of different continents?

List in proper sequence the processes involved in recombinant DNA (rDNA) technology.

On his visit to a national park, Harshendra was very angry as the forest authorities did not allow him to enter a specified area. On returning back, he discussed the matter with his friend, who explained him the reason.

1. Which category of conservation strategy does national park belong?
2. Name India's first national park.
3. At present, there are how many national parks in India?
4. What values are shown by Harshendra's friend?

Highlight the differences between the population interactions given below. Give an example of each.

1. Parasitism.
2. Amensalism.
3. Mutualism.

What is translation? Describe the translation process with diagram.

Write a short note on extinct species?

List any two types of IUDs that are available for human females and state their mode of action.

State any three methods by which animals cope with the temporary unfavourable conditions in their habitat when they cannot migrate.