12th Standard Syllabus & Materials

12th Standard

TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Standard Biology English Medium Botany - Ecosystem 2 Mark Creative Question Paper and Answer Key 2022 - 2023

Published on: 29/08/2022

QB365 provides a detailed and simple solution for every Possible Creative Questions in Class 12 Biology Subject - Botany - Ecosystem, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.

Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions + Answers key

Take MCQ Biology Test

QB365 Student Learing Managemnet System

Std: 12th Standard - Biology

chapter: - Model Question paper

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Generic 2

15 x 2 = 30

State the role of herbivores and microconsumers in a terrestrial ecosystem.

Write the name of four important aspects of ecosystem.

Expand GPP and define it.

How Net Primary Productivity be derived?

What is meant by productivity of an ecosystem?

Define Grey carbon and Black carbon.

Point out the factors that affects the photosynthetically active radiation.

What do you mean by PAR? Mention its significance. (or) What is PAR?

What is standing crop?

10.

How will you define decomposers?

11.

Name the macro consumers and micro consumers.

12.

What are biotic components?

13.

Define 'Standing state' with regard to ecosystem.

14.

Mention any two climatic factors and edaphic factors of an ecosystem.

15.

According to A.G. Tansley, what is an ecosystem?

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Generic 2

15 x 2 = 30

(a) Herbivores acts as primary consumers of producers (Plants).
(b) Microconsumers decomposes the dead ,remains and excreta of plants and animals.

(a) Productivity
b) Energy flow
(c) Decomposition
(d) Nutrient cycling

Gross Primary Productivity (GPP) is the total amount of food energy or organic matter or biomass produced in an ecosystem by autotrophs through the process of photosynthesis is called gross primary productivity.

Net Primary Productivity (NPP) is derived by the difference between Gross primary productivity (GPP) and respiration.
NPP = GPP - Respiration

The rate of biomass production per unit area in a unit time is called productivity. It can be expressed in terms of gm /m² /year or KcaVm²/ year.

Grey carbon - carbon stored in fossil fuel (coal, oil and biogas deposits in the lithosphere).
Black carbon - carbon emitted from gas, diesel engine and coal fired power plants.

PAR is not always constant because of clouds, tree shades, air, dust particles, seasons, latitudes and length of the daylight availability.

The amount of light available for photosynthesis of plants is called Photosynthetically Active Radiation (PAR) which is between the range of 400-700 nm wave length.

The amount of living materials present in a population at any given time is known as standing crop.

10.

Decomposers are organisms that decompose the dead plants and animals to release organic and inorganic nutrients into the environment which are again reused by plants. Example: Bacteria, Actinomycetes and Fungi.

11.

(i) Macro consumers are herbivores, carnivores and omnivores.
(ii) Micro consumers are decomposers.

12.

Biotic (living) components includes all living organisms like plants, animals, fungi and bacteria. They form the trophic structures of any ecosystem.

13.

The total inorganic substances present in any ecosystem at a given time is called standing quality (or) standing state.

14.

(a) Climatic factors: Light and Air.
(b) Edaphic factors: Soil and pH of soil.

15.

A.G. Tansley (1935), who defined ecosystem as 'the system resulting from the integration of all the living and non-living factors Of the environment'.