Class 12 Biology Chapter 16 Bioresources of Assam

Class 12 Biology Chapter 16 Bioresources of Assam The answer to each chapter is provided in the list so that you can easily browse through different chapters Assam Board HS 2nd Year Biology Chapter 16 Bioresources of Assam Question Answer.

Class 12 Biology Chapter 16 Bioresources of Assam

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Also, you can read the SCERT book online in these sections Solutions by Expert Teachers as per SCERT (CBSE) Book guidelines. These solutions are part of SCERT All Subject Solutions. Here we have given Assam Board Class 12 Biology Chapter 16 Bioresources of Assam Solutions for All Subjects, You can practice these here.

Bioresources of Assam

Chapter – 16


Very Short Answer Type Questions

Q.1. Natural resources are the products of____ and____

Ans : Plants, animals. 

Q.2. Out of 400 varieties of total Indian orchids, Assam is the home of nearly ___ orchid varieties. 

Ans : 300 

Q.3. About _____ nos of alkaloids have been isolated from the of Rauwolfia plants. 

Ans : 20 

Q.4. Quinine and cinchonine are obtained from _____ plant.

Ans : Cinchona.  

Q.5. Wood is the secondary tissue produced by the____ tissue of large trees. 

Ans : Primary. 

Q.6. The cervicogenic insects belong to the order_____

Ans : saturnidy.

Q.7. The female muga moth lays about _____ eggs on Kharika. 

Ans : 350 

Q.8. Pebrine is caused by ____

Ans : protozoa. 

Q.9. Kasseru is ____ food plant of eri silkworm. 

Ans : Secondary.

Q.10. Increase in concentration of toxicant at successive trophic levels is known as ____ 

Ans : Toxication (pollution)

Q.11. Major component of natural resources produced from Plants and Animals are called _____

Ans : Bioresources.

Q.12. Role of plants in controlling rainfall, soil erosion, pollution etc. ultimately maintain the of our environment. 

Ans : equilibrium.

Q.13. Alkaloid reserpine obtained from the plant____

Ans : Rauwolfia Serpentina.

Q.14. A popular drug ‘Vaska’ prepared from ____ and used as _____

Ans : Adhatoda Vasica, expectorant.

Q.15. Botanical name of Sal tree is _____

Ans : Shorea robusta. 

(B). True or False (1 mark each) : 

Q.1. Plants provide food, clothes and shelter to the human. 

Ans : True.

Q.2. Quinine, quinidine, cinchonine are the important and adequate medicines used to promote strength and vigor. 

Ans : False. 

Q.3. Medicines obtained from Atropa belladonna is used to get relieve from pains of cardiac muscles and palpitation of heart. 

Ans : True.

Q.4. Heart wood and sap wood of teak plant are white and golden yellow respectively in colour. 

Ans : False.

Q.5. Gmelina arborea is the botanical name of Indian redwood (sisso) belonging to family Verbenaceae. 

Ans : True.

Q.6. Sericulture is an important cottage industry of Assam. 

Ans : True.

Q.7. The primary food plant of Bombyx mori is castor. 

Ans: False.

Q.8. The eggs of silk moth are washed in 2% formalin for disinfection. 

Ans : True.

Q.9. Timber is the commercial term applied to neatly prepared wood of stem of higher plants. 

Ans : True.

Q.10. Atropa belladonna is the Botanical name of Indian Ginseng belonging to family solanaceae. 

Ans : False.

Q.11. Forest of Assam are full of future genetic resources. 

Ans : True.

(C). Very short Answer questions : (1 mark each) : 

Q.1. What is natural resource? 

Ans : The substances which are supplied by nature which is for the human welfare is known as natural resource.

Q.2. What do you mean by Biological hot spot? 

Ans : Biological hot spot are those areas which are very rich in biodiversity and the plants and animals are endemic to that area. 

Q.3. What are the genetic resources of forest? 

Ans : The tropical rain forest, evergreen, deciduous, swamp, riverian forest etc. are the genetic resources of forest. 

Q.4. Who first described the plant Rauwolfia? 

Ans : Rauwolf first described the plant Rauwolfia. 

Q.5. What do you understand by rain forest? 

Ans : Rain forests are very dense or thick forests that even sunlight cannot penetrate the lower strata of the forest. The floor of the forest remains covered with lower types of plants. 

Q.6. What is sericulture?

Ans : The rearing of silk worm is called the sericulture. Sericulture is an agro based industry. 

Q.7. Write the name of the family to which Mulberry silk moth belongs. 

Ans : Bombycidae. 

Q.8. Write the scientific name of mulberry silk moth.

Ans : Bombyx mori. 

Q.9. Describe the precautionary measures to be taken in muga silkworm rearing. 

Ans : (i) The host plants should be healthy. 

(ii) The food leaves should not be wet. 

(iii) The rearing room should be well ventilated. 

(iv) The seed should be collected from the healthy female. 

Q.10. Define spinneret. 

Ans : Spinneret is a part of the silkworm present in the lower portion of the mouth parts and it is responsible for the secretion of a sticky substance which is converted to silk and hence it is called as silk gland. 

Q.11. When did the Air ( Prevention and Control of Pollution) Act came into force in India? 

Ans : Air (Prevention and control of Pollution) Act, was enacted on 29th March, 1981. 

Q.12. What are major necessities of human life provided by plants? 

Ans : Food, Shelter and respiratory gases. 

Q.13. What is the botanical name of Cinchona plant? 

Ans : Cinchona calisaya. 

Q.14. Why neem plant is called wonder plant? 

Ans : It purify the air, having a number of medicinal values of each and every part of Neem.

(D). Short answer questions (2 marks each) : 

Q.1. How and why almost all animals including human are directly or indirectly depend on plants for survival? 

Ans : All the animals including carnivores and herbivores are depended upon the plants directly or indirectly. Animals directly depends on plant for food and shelter and some other depends on indirectly on the herbivorous animals. Moreover the civilization of human being is collecting silk, fuel, paper, medicines, oil, etc., from the plant kingdom only. The existence of Animals is directly depending upon the existence of plants only. 

Q.2. What is ethnobotany? How it is related. to medicinal plants? 

Ans : The study of medicinal plants used by the tribal peoples traditionally from the time of civilization is called as ethnobotany. 

It is generally related with medicinal plants, because these people are using plants or parts of plants which are locally available in the jungle or forest of Assam to cure various diseases or disorders and gets benefited also. So, the brief study of plants helps us to identify these medicinal plants at least. 

Q.3. “Assam is a land of biological hot spot” Give reasons. 

Ans : Assam, in North East India is very rich in biodiversity. It is regarding as the hot spot because Assam is the home land of may valuable plants and animals. In India, out of 315 families of gymnosperms about 200 families and among 400 orchid species about 300 species of orchids are found in Assam. Moreover different types of timber producing, silk or fibre colour producing, bamboo, cane, resin, lentils etc. are the product of plants or forests of Assam. Moreover, the forest gives us the scenic beauty and keeps the climate in natural and hence Assam is called the land of biological hot spot. 

Q.4. Give the botanical name mentioning their family names of the two plants whose roots are used for preparation of medicines.

Ans : (a) Rauwolfia 

               Family: Apocynosi 

               Sci. Name : Rauwolfia serpentina 

(b) Jasticia: 

      Family : Acauthesis.

      Sc. Name : Justicia adhatoda.

Q.5. What are the different silkworms cultured in Assam commercially. 

Ans : The different species of silkworms found in Assam are: 

(i) Mulberry silk worm (Bombyx mori)

(ii) Eri Silk worm (Philosamia ricini) 

(iii) Muga silk worm (Antheraea assama) 

(iv) Tasar silk worm (Philosamia paphia) 

Q.6. Give the systematic position of muga silkworm. 

Ans : The systematic position of muga silk worm is : 

Phylum : Arthropoda.

Class : Insecta.

Family : Saturniidae. 

Genus: Antherea. 

Species : A. assama.

Q.7. According to families prepare a list of commercially reared silkworm in Assam. 

Ans : The families are : 

(i) Bombycidae : (a) Bombyx mori.

(ii) Saturniidae : 

(a) Philosamia ricini.

(b) Antheraea assama.

(c) Philosamia paphia.

Q.8. Give the scientific name and one primary host plant of muga and eri silkworms.

Ans : (i) Eri Silk worm : 

(a) Sc. Name : Philosamia ricini. 

(b) Primary host plant : Castor plant. 

(ii) Muga Silk worm : 

(a) Sc. Name : Antheraea assama.

(b) Primary host plant : Som, Sualu.

Q.9. What are the species of commercially reared Tasar silkworm? State the name two food plants of Tasar silkworm. 

Ans : The species of Tasar silkworms are – Antheraea paphia, Anthrea mylita. 

Q.10. What is the causative organism and symptoms of Flacherie? 

Ans : The causative organism of Flacherie is virus followed by secondary bacterial attack. The larva after the infection becomes black in colour and motionless. 

Q.11. What measures are to be adopted when the culture is infected by flacherie. 

Ans : The measures to control the Flacherie: 

(a) The excreta and dead larvae should be immediately removed.

(b) The host leaves should be dry and treated by sun. 

(c) The rearing room should be well ventilated and lighted. 

Q.12. What are the cellular constituents of commercial timber? 

Ans : The commercial timber has small whitish sapword and large brown to dark heartwood. 

Q.13. Write the botanical names of any two medicinal plants from which cough expectorant is prepared. 

Ans : (i) Vasaka – Adhatoda vasica. 

         (ii) Doron – Leucas linifolia.

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