What are the necessary conditions for autotrophic nutrition and what are its by-products?
When the living organisms obtain food and utilizes it for the use in various biological activities like growth, maintenance and for the energy need is known as nutrition. Some nutritional elements like amino acids, fatty acids, vitamins and minerals.
Autotrophic nutrition: Preparation of organic food from the inorganic material in the organism’s own body is known as autotrophic nutrition also called self nourishing organisms.
There are two modes of autotrophic nutrition:-
Photoautotrophic nutrition is the preparation of organic food from inorganic material by utilizing sun’s energy (photosynthesis process) and on the other hand, chemoautotrophic nutrition or chemosynthesis is the preparation of organic food with the help of chemical reaction energy.
The necessary conditions for autotrophic nutrition are chlorophyll, sunlight, carbon dioxide, water in photoautotrophic nutrition they take carbon dioxide and water from the environment and transform these into the glucose and oxygen by the process of photosynthesis trapped by chlorophyll; and in chemoautotrophic nutrition, some bacteria develops a technique to capture energy released by the oxidation of inorganic chemical substances and make organic food. Eg. Nitrifying bacteria like Nitrosomonas and Nitrobacter.
Their by products are glucose and oxygen. And, their by products are represented in the following equation:-
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
How is the amount of urine produced regulated?
What criteria do we use to decide whether something is alive?
What are the different ways in which glucose is oxidised to provide energy in various organisms?
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm. (c) chloroplast.
(b) mitochondria. (d) nucleus.
What are the differences between autotrophic nutrition and heterotrophic nutrition?
What are outside raw materials used for by an organism?
What would be the consequences of a deficiency of haemoglobin in our bodies?
What are the components of the transport system in highly organised plants?
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What is a good source of energy?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What changes can you make in your habits to become more environment-friendly?
What is the difference between a reflex action and walking?
What is the importance of DNA copying in reproduction?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table?
What change will you observe if you test soap with litmus paper (red and blue)?
Why does dry HCl gas not change the colour of the dry litmus paper?
What type of oxides are formed when non-metals combine with oxygen?
Why are traits acquired during the life-time of an individual not inherited?
What are the different ways in which individuals with a particular trait may increase in a population?
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Outline a project which aims to find the dominant coat colour in dogs.
A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?
Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic Table.