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Cnidaria - Protozoa
The mature medusoid jellyfishes like Aurelia are the sexual stages. Sperms and eggs produced in the dissimilar (male and female) individuals ale released in water, which then fuse to form a zygote. The latter develops into a fixed polyploids scyphistoma that undergoes various transverse fission to produce ephyras by the process called Strobilation (see page lo), a type of asexual reproduction. Thus the sexual generation of the adult jellyfish is alternated along with an asexual generation i.e., scyphistoma. You would recall the alternation of generation is quite common among hydrozoans, in which the highly branching sedentary colonies such as those of Obelia are asexual generations. They give off medusae which are sexual generations. The medusae give rise to the colonies and vice versa, alternating with one another.
PHOSPHORUS It is present in vegetables, grains (oat metal, wheat meal), milk, eggs, cheese, meat, fish, etc. It helps in - (a) Like calcium it is a constituent of bones.
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TYPE S - There are present three types of muscle fibres: 1. Striped or striated or skeletal or voluntary muscles. 2. Unstriped or non-striated o
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GROWTH AT DIFFERENT LEVELS - 1. Molecular level - It involves synthesis of new molecules and their aggregation into organellae. 2. Cellular level - It includes
Describe three ways that RNA differs from DNA. RNA is single stranded; DNA is double stranded all of the codons from the deletion point to the end of the transcript would be s
are viruses cellular organisms
How old is the universe? From the analysis of data collected by the Hubble telescope the age of the universe is estimated to be about 12 billion years.
Preoperative antibiotics Preoperative antibiotics can decrease the incidence of infection after colorectal surgery; for elective operations, an oral regimen of neomycin (not a
Define the Disorders due to the iodine deficiency? Mild goitre, i.e., a larger thyroid gland than normal. The mildest form of goitre ranges from those only detectable by to
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