How do Organisms Reproduce Test - 14

In the leaves ofBryophyllum meristamatic marginal notches are present. From these meristamatictissues new plants can develop after coming in contact of soil

Cutting is a method ofvegetative propagation used to grow roses 

 In humans, thisevent occurs when the de Graaf's follicles rupture and release the secondaryoocyte ovarian cells. 

Ovum is the female sex cell, or female gamete; the male gamete is the sperm. A gamete, ovum or sperm, contains half the number of chromosomes found in the body cells of the parent, i.e., the gamete is haploid. In human there are total 46 chromosomes, so human ovum has only 23 chromosomes.

Typhoid is transmittedby direct contact with the infected person or through contaminated food andwater.

Bees showhaplodiploidy.

The flowers in which either male or female reproductive organs are present.These flowers are called incomplete flowers 

In the testis, spermform in the seminiferous tubules, but are stored in the epididymis where theymature. They move through the vas deferens and mix with secretions from theseminal vesicle and bulbourethral gland to form the semen. They enter the urethraat the base of the penis.

Epididymis is a tubelike structure in the male reproductive system that connects a testicle to thevas deferens

Leydig cells release aclass of hormones called androgens.

 At the time ofpollination, tube nucleus is present, i.e. the pollen grainis usually 3-celled (tube cell + two male gametes)

Pollen tube release 2male gametes in the embryo sac. Out of thes 2 gametes 1 gamete gets fused withthe egg and the other one gets fused with the polar nuclei.

Geneticdrift cannot be removed by self pollination.

Oospores are diploidas they have 2n number of chromosomes.

Hair and nails have aprotein called keratin which allows them to grow. The process of growing ofnails and hair is known as keratinization.