The cell theory was given by Schleiden and Schwann, which was later modified by Rudolf Virchow. The three principles of cell theory are: All... View Article
The two types of nervous systems are: Central nervous system (CNS) - Responsible for information processing and control. It includes the brain... View Article
The inside of the nucleus is connected to the cytosol by nuclear pore complexes present in the nuclear envelope. The movement of RNA and protein... View Article
Sunflower belongs to the Asteraceae or Compositae family. Disc florets of sunflower have two fused carpels and 5 stamens. Further reading:... View Article
Pistil has an ability to recognise the right type of pollen and accept it for further germination. The pollen grains, which are of different... View Article
Plasmids can clone only a small fragment of DNA. They are small, circular, extrachromosomal DNA present in bacteria, which can replicate... View Article
The chorion participates in the formation of placenta. The chorionic villi present on the trophoblast and uterine tissue interdigit and form... View Article
Implantation occurs after 7-8 days of fertilisation. The fertilised ovum starts dividing and then from the morula (8-16 cells) the embryo... View Article
During IVF, the embryo transfer is done either at an early stage with up to 8 blastomeres or zygote transfer, which is transferred into the... View Article
An embryo is called as foetus only after 8 weeks of fertilisation or conception or after 10 weeks of pregnancy. Further reading: Reproductive... View Article
A four week embryo is of a size of a poppy seed, around 0.04 inch long. The heart begins to form in the embryo and starts beating after one month... View Article
When a pollen grain falls on stigma, there occurs chemical communication between pollen grain and pistil, which helps pistil in recognising the... View Article
Meiosis is also called reduction division as the chromosomes are halved in the daughter cells. Gametes are produced by meiosis in the germ cells.... View Article
Yes, ginger is a flowering plant. It is an angiosperm and monocotyledon. It belongs to the family Zingiberaceae. Further reading: Endosperm... View Article
Grasses are wind pollinated. Wind transfers pollen to stigma and then through growing pollen tube male gamete enters the ovule. Further reading:... View Article
After pollination, male gametes fuse with the egg cell and the secondary nucleus to undergo double fertilisation. After fertilisation, the ovule... View Article
Pollen grains are produced inside the anther. Pollen mother cells of sporogenous tissue, present in the centre of each microsporangium divide... View Article
Non-flowering and seedless plants are known as cryptogams. They reproduce by spores. Examples include algae, bryophytes and pteridophytes.... View Article
