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Published on: 29/08/2022
QB365 provides a detailed and simple solution for every Possible Book Back Questions in Class 12 Biology Subject - Botany - Principles of Ecology, 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 Test1.
Sticky glands of Boerhavia and Cleome support _______.
Anemochory
Zoochory
Autochory
Hydrochory
2.
Strong, sharp spines that get attached to animal’s feet are found in the fruits of ______.
Argemone
Ecballium
Heritier
Crossandra
3.
Match the following and choose the correct combination from the options given below:
| Column I (Interaction) | Column II (Examples) |
| I. Mutualism II. Commensalism III. Parasitism IV. Predation V. Amensalism |
i) Trichoderma and Penicillium ii) Balanophora, Orobanche iii) Orchids and Ferns iv) Lichen and Mycorrhiza v) Nepenthes and Diaonaea |
| I | II | III | IV | V |
| i | ii | iii | iv | v |
| I | II | III | IV | V |
| ii | iii | iv | v | i |
| I | II | III | IV | V |
| iii | iv | v | i | ii |
| I | II | III | IV | V |
| iv | iii | ii | v | i |
4.
In a fresh water environment like pond, rooted autotrophs are ______.
Nymphaea and typha
Ceratophyllum and Utricularia
Wolffia and pistia
Azolla and lemna
5.
Which of the following plant has a non-succulent xerophytic and thick leathery leaves with waxy coating
Bryophyllum
Ruscus
Nerium
Calotropis
6.
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
7.
8.
A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern Azolla ______.
Nostoc
Anabaena
chlorella
Rhizobium
9.
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
10.
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 | (-) | o |
| A | B | C | D |
| (+) | Parasitism | (-) | Amensalism |
| A | B | C | D |
| (-) | Mutualism | (+) | Competition |
| A | B | C | D |
| (+) | Competition | (0) | Mutualism |
| A | B | C | D |
| (O) | Amensalism | (+) | Parasitism |
11.
The plant of this group are adapted to live partly in water and partly above substratum and free from water ______.
Xerophytes
Mesophytes
Hydrophytes
Halophytes
12.
Column I represent the size of the soil particles and Column II represents type of soil components. Which of the following is correct match for the Column I and Column II
| 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 | III | IV |
| ii | iii | iv | i |
| I | II | III | IV |
| iv | i | iii | ii |
| I | II | III | IV |
| iii | ii | i | iv |
None of the above
13.
14.
15.
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 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.
16.
Read the given statements and select the correct option.
i) Loamy soil is best suited for plant growth as it contains a mixture of silt, sand and clay.
ii) The process of humification is slow in case of organic remains containing a large amount of lignin and cellulose.
iii) Capillary water is the only water available to plant roots as it is present inside the micropores.
iv) 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
17.
Which of the given plant produces cardiac glycosides?
Calotropis
Acacia
Nepenthes
Utricularia
18.
Read the given statements and select the correct option.
i) Hydrophytes possess aerenchyma to support themselves in water.
ii) Seeds of Viscum are positively photoblastic as they germinate only in presence of light.
iii) Hygroscopic water is the only soil water available to roots of plant growing in soil as it is present inside the micropores.
iv) 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
19.
A specific place in an ecosystem, where an organism lives and performs its functions is _____.
habitat
niche
landscape
biome
20.
Ecology is the study of an individual species is called
i) Community ecology
ii) Autecology
iii) Species ecology
iv) Synecology
i only
ii only
i and iv only
ii and iii only
21.
Arrange the correct sequence of ecological hierarchy starting from lower to higher level.
Individual organism → Population Landscape → Ecosystem
Landscape → Ecosystem → Biome → Biosphere
community → Ecosystem → Landscape → Biome
Population → organism → Biome → Landscape
1.
(b)
Zoochory
2.
(a)
Argemone
3.
(d)
| I | II | III | IV | V |
| iv | iii | ii | v | i |
4.
(a)
Nymphaea and typha
5.
(c)
Nerium
6.
(b)
Absorbing inorganic ions from soil
7.
(d)
8.
(b)
Anabaena
9.
(c)
Mimicry
10.
(a)
| A | B | C | D |
| (+) | Parasitism | (-) | Amensalism |
11.
(c)
Hydrophytes
12.
(c)
| I | II | III | IV |
| iii | ii | i | iv |
13.
(a)
14.
(c)
15.
(b)
Statement A is correct but statement B is incorrect
16.
(a)
i, ii and iii only
17.
(a)
Calotropis
18.
(d)
i and ii only
19.
(b)
niche
20.
(d)
ii and iii only
21.
(c)
community → Ecosystem → Landscape → Biome
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