Tamil Nadu Board of Secondary EducationHSC Science Class 12th
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Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide chapter 6 - Principles of Ecology [Latest edition]

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Class 12th Biology Botany answers guide - Shaalaa.com
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Chapter 6: Principles of Ecology

Evaluation
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Evaluation [Pages 130 - 132]

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide Chapter 6 Principles of EcologyEvaluation [Pages 130 - 132]

Evaluation | Q 1 | Page 130

Arrange the correct sequence of ecological hierarchy starting from lower to a higher level.

  • Individual organism → Population Landscape → Ecosystem

  • Landscape → Ecosystem → Biome → Biosphere

  • community → Ecosystem → Landscape → Biome

  • Population → organism → Biome → Landscape

Evaluation | Q 2 | Page 130

Ecology is the study of an individual species is called

  1. Community ecology
  2. Autecology
  3. Species ecology
  4. Synecology
  • i only

  • ii only

  • i and iv only

  • ii and iii only

Evaluation | Q 3 | Page 130

A specific place in an ecosystem, where an organism lives and performs its functions is

  • habitat

  • niche

  • landscape

  • biome

Evaluation | Q 4 | Page 130

Read the given statements and select the correct option.

  1. Hydrophytes possess aerenchyma to support themselves in water.
  2. Seeds of Viscum are positively photoblastic as they germinate only in presence of light.
  3. Hygroscopic water is the only soil water available to roots of plants growing in soil as it is present inside the micropores.
  4. High temperature reduces use of water and solute absorption by roots.
  • i, ii, and iii only

  • ii, iii and iv

  • ii and iii only

  • i and ii only

Evaluation | Q 5 | Page 130

Which of the given plant produces cardiac glycosides?

  • Calotropis

  • Acacia

  • Nepenthes

  • Utricularia

Evaluation | Q 6 | Page 130

Read the given statements and select the correct option.

  1. Loamy soil is best suited for plant growth as it contains a mixture of silt, sand, and clay.
  2. The process of humification is slow in the case of organic remains containing a large amount of lignin and cellulose.
  3. Capillary water is the only water available to plant roots as it is present inside the micropores.
  4. Leaves of shade plant have more total chlorophyll per reaction centre, low ratio of chl a and chl b are usually thinner leaves.
  • i, ii, and iii only

  • ii, iii, and iv only

  • i, ii, and iv only

  • ii and iii only

Evaluation | Q 7 | Page 130

Read the given statements and select the correct option.

Statement A: Cattle do not graze on weeds of Calotropis.

Statement B: Calotropis have thorns and spines, as a defense against herbivores.

  • Both statements A and B are incorrect.

  • Statement A is correct but statement B is incorrect.

  • Both statements A and B are correct but statement B is not the correct explanation of statement A.

  • Both statements A and B are correct and statement B is the correct explanation of statement A.

Evaluation | Q 8 | Page 130

In soil water available for plants is

  • gravitational water

  • chemically bound water

  • capillary water

  • hygroscopic water

Evaluation | Q 9 | Page 131

Read the following statements and fill up the blanks with the correct option.

  1. Total soil water content in soil is called ______
  2. Soil water not available to plants is called ______
  3. Soil water available to plants is called ______
  • (i) - Holard, (ii) - Echard, (iii) - Chresard

  • (i) - Echard, (ii) - Holard, (iii) - Chresard

  • (i) - Chresard, (ii) - Echard, (iii) - Holard

  • (i) - Holard, (ii) - Chresard, (iii) - Echard

Evaluation | Q 10 | Page 131

Column I represent the size of the soil particles and Column II represents the type of soil components. Which of the following is the correct match for the Column I and Column IL

Column - I Column - II
I) 0.2 to 2.00 mm i) Slit soil
II) Less than 0.002 mm ii) Clayey soil
III) 0.002 to 0.02 mm iii) Sandy soil
IV) 0.002 to 0.2 mm iv) Loamy soil
  • I - ii, II - iii, III - iv, IV - i

  • I - iv, II - i, III - iii, IV - ii

  • I - iii, II - ii, III - i, IV - iv

  • None of the above

Evaluation | Q 11 | Page 131

The plant of this group are adapted to live partly in water and partly above substratum and free from water

  • Xerophytes

  • Mesophytes

  • Hydrophytes

  • Halophytes

Evaluation | Q 12 | Page 131

Identify the A, B, C, and D in the given table

Interaction Effects on species X Effects on species Y
Mutualism A (+)
B (+) (-)
Competition (-) C
D (-) 0
  • A - (+), B - Parasitism, C - (-), D - Amensalism

  • A - (-), B - Mutalism, C - (+), D - Competition

  • A - (+), B - Competition, C - (0), D - Mutalism

  • A - (0), B - Amensalism, C - (+), D - Parasitism

Evaluation | Q 13 | Page 131

Ophrys an orchid resembling the female of an insect so as to able to get pollinated is due to phenomenon of

  • Myrmecophily

  • Ecological equivalents

  • Mimicry

  • None of these

Evaluation | Q 14 | Page 131

A free-living nitrogen-fixing cyanobacterium which can also form a symbiotic association with the water fern Azolla

  • Nostoc

  • Anabaena

  • chlorella

  • Rhizobium

Evaluation | Q 15 | Page 131

Pedogenesis refers to

  • Fossils

  • Water

  • Population

  • Soil

Evaluation | Q 16 | Page 131

Mycorrhiza promotes plant growth by

  • Serving as a plant growth regulators

  • Absorbing inorganic ions from soil

  • Helping the plant in utilizing atmospheric nitrogen

  • Protecting the plant from infection

Evaluation | Q 17 | Page 131

Which of the following plant has non-succulent xerophytic and thick leathery leaves with a waxy coating

  • Bryophyllum

  • Ruscus

  • Nerium

  • Calotropis

Evaluation | Q 18 | Page 131

In a fresh water environment like pond, rooted autotrophs are

  • Nymphaea and typha

  • Ceratophyllum and Utricularia

  • Wolffia and pistia

  • Azolla and lemna

Evaluation | Q 19 | Page 131

Match the following and choose the correct combination from the options given below:

Column I (Interaction) Column II (Examples)
I. Mutualism i) Trichoderma and Penicillium
II. Commensalism ii) Balanophora, Orobanche
III. Parasitism iii) Orchids and Ferns
IV. Predation iv) Lichen and Mycorrhiza
V. Amensalism v) Nepenthes and Diaonaea
  • I - i, II - ii, III - iii, IV - iv, V - v

  • I - ii, II - iii, III - iv, IV - v, V - i

  • I - iii, II - iv, III - v, IV - i, V - ii

  • I - iv, II - iii, III - ii, IV - v, V - i

Evaluation | Q 20 | Page 132

Strong, sharp spines that get attached to animal’s feet are found in the fruits of

  • Argemone

  • Ecballium

  • Heritier

  • Crossandra

Evaluation | Q 21 | Page 132

Sticky glands of Boerhaavia and Cleome support

  • Anemochory

  • Zoochory

  • Autochory

  • Hydrochory

Evaluation [Pages 132 - 133]

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide Chapter 6 Principles of EcologyEvaluation [Pages 132 - 133]

Evaluation | Q 22 | Page 132

Define ecology.

Evaluation | Q 23 | Page 132

What is ecological hierarchy?
Name the levels of ecological hierarchy.

Evaluation | Q 24 | Page 132

What are ecological equivalents? Give one example.

Evaluation | Q 25 | Page 132

Distinguish habitat and niche

Evaluation | Q 26 | Page 132

Why are some organisms called as eurythermals and some others as stenohaline?

Evaluation | Q 27 | Page 132

‘Green algae are not likely to be found in the deepest strata of the ocean’. Give at least one reason.

Evaluation | Q 28 | Page 132

What is Phytoremediation?

Evaluation | Q 29 | Page 132

What is Albedo effect and write their effects?

Evaluation | Q 30 | Page 132

The organic horizon is generally absent from agricultural soils because tilling, e.g., plowing, buries organic matter. Why is an organic horizon generally absent in desert soils?

Evaluation | Q 31 | Page 132

Soil formation can be initiated by biological organisms. Explain how?

Evaluation | Q 32 | Page 132

Sandy soil is not suitable for cultivation. Explain why?

Evaluation | Q 33 | Page 132

Describe the mutual relationship between the fig and wasp and comment on the phenomenon that operates in this relationship.

Evaluation | Q 34 | Page 132

Lichen is considered as a good example of obligate mutualism. Explain.

Evaluation | Q 35 | Page 132

What is mutualism? Mention any two examples where the organisms involved are commercially exploited in modern agriculture.

Evaluation | Q 36 | Page 132

List any two adaptive features evolved in parasites enabling them to live successfully on their host?

Evaluation | Q 37 | Page 132

Mention any two significant roles of predation plays in nature.

Evaluation | Q 38 | Page 132

How does an orchid Ophrys ensure its pollination by bees?

Evaluation | Q 39 | Page 132

Water is very essential for life. Write any three features for plants that enable them to survive in a water-scarce environment.

Evaluation | Q 40 | Page 132

Why do submerged plants receive weak illumination than exposed floating plants in a lake?

Evaluation | Q 41 | Page 132

What is vivipary? Name a plant group that exhibits vivipary.

Evaluation | Q 42 | Page 132

What is thermal stratification? Mention their types.

Evaluation | Q 43 | Page 132

How is rhytidome act as the structural defense by plants against fire?

Evaluation | Q 44 | Page 132

What is myrmecophily?

Evaluation | Q 45 | Page 132

What is a seed ball?

Evaluation | Q 46 | Page 132

How is anemochory differ from zoochory?

Evaluation | Q 47 | Page 132

What is co-evolution?

Evaluation | Q 48 | Page 132

Explain Raunkiaer classification in the world’s vegetation based on the temperature.

Evaluation | Q 49 | Page 132

List out the effects of fire on plants.

Evaluation | Q 50 | Page 132

What is the soil profile? Explain the characters of different soil horizons.

Evaluation | Q 51 | Page 132

Give an account of various types of parasitism with examples.

Evaluation | Q 52 | Page 132

Explain different types of hydrophytes with examples.

Evaluation | Q 53 | Page 132

Enumerate the anatomical adaptations of xerophytes.

Evaluation | Q 54 | Page 133

List out any five morphological adaptations of halophytes.

Evaluation | Q 55 | Page 133

What are the advantages of seed dispersal?

Evaluation | Q 56 | Page 133

Describe the dispersal of fruit and seeds by animals.

Chapter 6: Principles of Ecology

Evaluation
Class 12th Biology Botany answers guide - Shaalaa.com

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide chapter 6 - Principles of Ecology

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide chapter 6 (Principles of Ecology) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 12th Biology Botany answers guide solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 12th Biology Botany answers guide chapter 6 Principles of Ecology are Ecology, Ecological Factors, Ecological Adaptations, Dispersal of Fruits and Seeds.

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