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Q. Do echinoderms present external or internal fecundation? Is there sex division among individuals?
The fecundation in echinoderms is external, gametes are liberated in water where fecundation occurs.
The majority of echinoderms are dioecious with female and male individuals.
Chloroplasts Like mitochondria, chloroplasts are also distinctive organelles of eucaryotic cell. But they are found only in plant cells. Chloroplasts contain membranes forming
FEMALE REPRODUCTIVE SYSTEM - In female mammals the female reproductive system characteristically comprises of the ovary, uterus, placenta, vagina and vulva.
Define Procedure for Detection of Chalk in Flour Carry out the experiment following the procedure given herewith: 1. Take a teaspoon of flour in a test tube and shake it wit
CONDITIONE D REFLEX - Response which is achieved by training is conditioned reflex. I. P. Pavlov in 1920 displayed it by experimenting on dog. These are voluntary in
How is the circulatory system of birds characterized? Birds, as every vertebrate, have a closed circulatory system. The heart is same to the mammalian heart, having four chambe
What is Atrial Switch operation and Rastelli in Heart dieases? Atrial Switch Operation: (Senning or Mustard procedures) By means of a baffle the systemic venous blood could b
Reproduction and Life Cycles – Protozoan Asexual reproduction occurs in all protozoan through fission, budding and cyst formation. In this method the organism reproduces to fo
How are the male gametophytes and the male gametes formed in angiosperms? In the anthers of every stamen there are pollen sacs. Within the pollen sacs there are microspore moth
Uses of Grafting Grafting helps to preserve and perpetuate varieties that cannot reproduce by vegetative method. Grafting changes less useful varieties to more desirable
What is meant by the expression 'infant mortality'? Infant mortality refers to the number of babies in a population who die at the age of 1 year or less. It is usually express
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