STD 12 - 3. reproductive health — Biology STD 12 Science — Question

The system of development in which humans started using skins to protect their bodies and burying their dead under the ground.

Gestation period is the duration

In which epoch the fossils of Sinanthropus pekinensis have been discovered?

Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution,

1. Lower groups of organisms have simpler body design.
2. Asexual reproduction is common in lower groups.
3. Asexual reproduction is common in higher groups of organisms.
4. The high incidence of sexual reproduction in angiosperms and vertebrates.

Choose the correct answer from the options given below:

Seminiferous tubules are found in:

During the course of development, cells in various regions of embryo become variable in morphology and eventually perform diverse functions. This process is known as

The principle of competitive exclusion was stated by