1- Prevention of pregnancy in women is called contraception.
2- Single celled organisms (bacteria, amoeba and paramecium) reproduce by fission.
3- The structure of deoxy ribonucleic acid (DNA) is discovered by Watson & Crick.
4- Reproduction through budding occurs in yeast. Fragmentation occurs in spirogyra, lichens.
5- Mitosis was discovered by Walther Fleming in 1879.
6-Birth control surgery in males called vasectomy and in females called tubectomy.
7- We get seedless fruits due to parthenogenesis (shift from sexual to asexual reproduction).
8-Central cell (secondary cell) in embryo sac contains two polar nuclei.
9- Vegetative reproduction through leaves takes place in Bryophyllum.
10- The second fertilization in plants gives rise to endosperm.
11-Cells that contain only one set of chromosomes are called haploid.
12- Reproduction in fungi (rhizopus, mucor) occurs through spores.
13- No. of cells present in pollen tube are two.
14- Spores containing leaves in fern are called as sporophylls.
15- Bottle guard and papaya are examples for unisexual flowers.
16- External fertilization is common in aquatic animals (fishes and amphibians).
17- The secretion of mammary glands after delivery of baby is called as colostrums.
18- Epididymis (sperms are stored temporarily) is formed by vasefferentia.
19-From the 3rd month of pregnancy the embryo is called as foetus.
20-DNA synthesis takes place in interphase (“S” stage).
21-AIDS (Acquired immuno deficiency syndrome) is caused by HIV.
22-Theodor Boveri confirmed the meiotic division in 1904.
23- The development of male reproductive organs regulated by testosterone.
Johnson and potu Rao revealed the structure of interphase chromosomes.
24- The release of ovum by rupturing of graffian follicle is called ovulation.
Facebook Comments Box
(Visited 107 times, 1 visits today)