Latest Updates

1. What is the basis of classification of algae? Solution: Presence of pigments which imparts traditional color on algae is the main basis for the classification of algae. Name of the pigment Chlorophyll type Color imparted Chlorophyceae Chlorophyll a and chlorophyll b Green Phaeophyceae chlorophyll a, chlorophyll c, fuxoxanthin Brown Rhodophyceae chlorophyll a and chlorophyll […]

1. Discuss how classification systems have undergone several changes over a period of time? Solution: Aristotle was the first person to introduce scientific classification. He used simple morphological characters to classify plants into trees, shrubs and herbs. He also divided animals into two groups, those which had red blood and those that did not. Linnaeus

1. Why are living organisms classified? Solution: Earth consists of millions of organisms, and we might be knowing the plants and animals that reside near us by their local names. These local names would vary from place to place, even within a country. This would lead to confusion in identifying and studying specific species. Hence

Question 1: What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river. Answer: Domestic sewage is the waste originating from the kitchen, toilet, laundry, and other sources. It contains impurities such as suspended solid (sand, salt, clay), colloidal material (fecal matter, bacteria, plastic and cloth fiber), dissolved materials

Question 1: Name the three important components of biodiversity. Answer: Biodiversity is the variety of living forms present in various ecosystems. It includes variability among life forms from all sources including land, air, and water. Three important components of biodiversity are: (a) Genetic diversity (b) Species diversity (c) Ecosystem diversity Question 2: How do ecologists estimate the total

Question 1: Fill in the blanks. (a) Plants are called as_________ because they fix carbon dioxide. (b) In an ecosystem dominated by trees, the pyramid (of numbers) is _________ type. (c) In aquatic ecosystems, the limiting factor for the productivity is _________. (d) Common detritivores in our ecosystem are_________. (e) The major reservoir of carbon on earth is_________. Answer: (a)

Question 1: How is diapause different from hibernation? Answer: Diapause is a stage of suspended development to cope with unfavourable conditions. Many species of Zooplankton and insects exhibit diapause to tide over adverse climatic conditions during their development. Hibernation or winter sleep is a resting stage where in animals escape winters (cold) by hiding themselves

Question 1: Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because − (a) bacteria are resistant to the toxin (b) toxin is immature: (c) toxin is inactive: (d) bacteria encloses toxin in a special sac. Answer: toxin is inactive: In bacteria, the toxin is present in an inactive form, called prototoxin, which gets

1. Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet). Solution: The recombinant proteins used in medical practice are obtained from the recombinant DNA technology. In this technology, particular genes are transferred from one organism to another with the help of

Question 1: Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why? Answer: Curd can be used