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Single-cell organisms, protists, have always been a problem for taxonomists who have trouble describing categories for organisms. Their mixed feeding habits that include being capable of photosynthesis - autotrophic, ingestion of other organisms - heterotrophic or survival on decaying and dead materials - saprophytic, makes them single-cell versions of plant, animal and fungal kingdoms. Kingdom Protista probably should not be a kingdom on its own. Instead, single-celled eukaryotes may be better placed in other biological kingdoms. In a zoology course the protists that we are most interested in have animal-like traits: no cell wall, heterotrophic, and capable of movement - the protozoans.
Phylum coelenterata
Describe in brief about retina The retina is a highly complex layer of nervous tissue. The photoreceptors are rods and cones for scotopic and photopic vision respectively. The
Proteins necessity They are called as body builders. The proteins are used in various metabolic pathways and body building. They help in repairing the tissues of the b
Q How does water move in sponges? What is the function of the pores in these animals? Sponges are filtering beings they make water enter their bodies by their lateral pores. Wa
Q. Show effects of Hypertension? Hypertension can be damaging due to two effects: 1. Increased work load on the heart, and 2. Effect of hypertension on arteries The in
Define the working of Cyclomixer? This is an electrical mixer used for mixing the contents of a test tube. The speed of the mixer can be adjusted to your requirement. This is a
Explain the Spectrophotometer or Colorimete? These can be used to measure the microbial growth or can be used in various microbial and biochemical assays. Figure illustrates t
Action of carbon dioxide receptor cells The respiratory center is sensitive to increased carbon dioxide levels and increased acidity of the blood. It is peculiar that even tho
Patient X has blood plasma levels of Parathyroid Hormone (PTH) that are always very high due to a tumor consisting of Parathyroid Gland cells that secrete high levels of PTH into t
In this section we are to discuss the means by which populations get separated or isolated from each other, first gain the status of'Sub-species and finally evolve mechanisms which
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