post fertilisation changes

Post Fertilisation Changes - After fertilization, the zygote undergoes a number of mitotic divisions and form a multicellular embryo. The primary endosperm nucleus also passes through a series of mitotic divisions and form a mass of endosperm cells which provide nouris..

After fertilization, the zygote undergoes a number of mitotic divisions and form a multicellular embryo. The primary endosperm nucleus also passes through a series of mitotic divisions and form a mass of endosperm cells which provide nourishment to the developing embry..

On reaching the stigma, the pollen grains put out a tube. This is called germination of the pollen grain. Fertilisation in a Flowering Plant The tip of the tube contains the male nuclei. The tube grows and enters the ovule where it bursts at the tip releasing the male gametes. One of..

Based on temperature and rainfall, each part of world has definite seasons in a year with many characteristic features about air temperature, hydrological changes, biological growth etc. In most parts of world, summer and winter seasons are clearly distinguished. The onset and closure of..

. The level of estrogens in blood increases gradually for a few days and is at the peak on the 12 t h day of the cycle. The estrogen surge reduces FSH secretion and this in turn introduces LH surge within 12 hours i.e., on the 13 t h day of the cycle. LH causes ovulation and formation of corpus lut..

Menstrual Cycle in Women - In women, reproductive phase begins with the onset of menses at about the age of 13 years. It ends with its cessation (menopause) at about the age of 45 - 49 years. During this reproductive period, the ovaries and the female reproductive tract undergo a series of cyclic h..

Two patterns of growth are commonly seen in animals regarding the proportion of the various body parts. Isometric growth: In this growth pattern, an organ grows at the same rate as the rest of the body. As the organism growths, the size remains proportional. Examples: Fish and Locust Allometric gro..

When transforming questions, check whether you have to change: pronouns place and time expressions A: Please come with me for lunch tomorrow. B: A requested me to go with him for lunch the next day. A: Kindly post this letter for me. B: A requested me to post ..

. The first half of the phase and the changes in these phases are controlled by estrogens and progesterone. The secretion of these hormones occur cyclically because of the cyclic secretions of pituitary gonadotropins in the female. The fertilised ovum in mammals and other higher..

"The Letter" is a touching story of an old man who is all alone and waits for his only daughter's letter for five long years. He receives that letter only at his grave but for that he pays a price. While living a lonely, morbid life, he undergoes some strange experiences of life in his interac..