Exercise Questions 1. What is meant by modification of root? What type of modification of root is found in the: (a) Banyan tree (b) Turnip (c) Mangrove trees Solution: In order to carry out some secondary functions or a specific adaptation, roots modify their structures – which can be its size, shape, or even normal …
NCERT Solutions for Class 11 Biology – Chapter 5 – Morphology of Flowering Plants Read More »
1. What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account? Solution Animals are classified based on common features such as the arrangement of cells, body symmetry, nature of coelom, patterns of digestive, circulatory or reproductive systems. Without these common features it is very …
NCERT Solutions for Class 11 Biology – Chapter 4- Animal Kingdom Read More »
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 …
NCERT Solutions for Class 11 Biology Chapter 3 – Plant Kingdom Read More »
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 …
NCERT Solutions for Class 11 Biology Chapter 2 – Biological Classification Read More »
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 …
NCERT Solutions for Class 11 Biology Chapter 1 – The Living World Read More »
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 …
NCERT Solutions for Class 12 Biology Chapter 16 – Environmental Issues Read More »
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 …
NCERT Solutions for Class 12 Biology Chapter 15 – Biodiversity and Conservation Read More »
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) …
NCERT Solutions for Class 12 Biology Chapter 14 – Ecosystem Read More »
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 …
NCERT Solutions for Class 12 Biology Chapter 13 – Organisms and Populations Read More »
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 …
NCERT Solutions for Class 12 Biology Chapter 12 – Biotechnology and its Applications Read More »
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