CLASS 12 BIOLOGY BOTANY - CHAPTER 6 PRINCIPLES OF ECOLOGY - 1 MARK QUESTIONS - ONLINE TEST - QUESTION 01-21 | இதில் 21 வினாக்கள் இடம் பெற்றிருக்கும். அதில் மிகச் சரியான விடையை தேர்ந்தெடுத்து SUBMIT செய்யுங்கள். பின்னர் உங்கள் விடையை சரி பாருங்கள். தவறுகள் இருப்பின் மீண்டும் ஒரு முறை முயற்சி செய்யவும். வாழ்த்துக்களுடன் : கல்விச்சோலை.நெட்.
1.
Arrange the correct sequence of ecological hierarchy starting from lower to higher level.
2.
Ecology is the study of an individual species is called i) Community ecology ii) Autecology iii) Species ecology iv) Synecology
3.
A specific place in an ecosystem, where an organism lives and performs its functions is
4.
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.
5.
Which of the given plant produces cardiac glycosides?
6.
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.
7.
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.
8.
In soil water available for plants is
9.
Read the following statements and fill up the blanks with correct option : ▶️i) Total soil water content in soil is called ____ ▶️ii) Soil water not available to plants is called ____ ▶️iii) Soil water available to plants is called ___
10.
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 📕I) 0.2 to 2.00 mm, 📕II) Less than 0.002 mm , 📕III) 0.002 to 0.02 mm, 📕IV) 0.002 to 0.2 mm, ❇️ Column - II 📕i) Slit soil , 📕ii) Clayey soil, 📕iii) Sandy soil , 📕iv) Loamy soil
11.
The plant of this group are adapted to live partly in water and partly above substratum and free from water
12.
Identify the A, B, C and D in the given table. ❇️Interaction : 1. Mutualism, 2. B, 3.Competition, 4.D ❇️Effects on species X : 1. A, 2. (+), 3. (-), 4. (-) ❇️Effects on species Y : 1. (+), 2. (-), 3.C, 4. 0
13.
Ophrys an orchid resembling the female of an insect so as to able to get pollinated is due to phenomenon of
14.
A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern Azolla
15.
Pedogenesis refers to
16.
Mycorrhiza promotes plant growth by
17.
Which of the following plant has a nonsucculent xerophytic and thick leathery leaves with waxy coating
18.
In a fresh water environment like pond, rooted autotrophs are
19.
Match the following and choose the correct combination from the options given below: ❇️ Column I (Interaction) : I) Mutualism, II) Commensalism, III) Parasitism, IV) Predation, V) Amensalism, ❇️Column II (Examples) : i) Trichoderma and Penicillium , ii) Balanophora, Orobanche , iii) Orchids and Ferns , iv) Lichen and Mycorrhiza , v) Nepenthes and Diaonaea
20.
Strong, sharp spines that get attached to animal’s feet are found in the fruits of
21.
Sticky glands of Boerhaavia and Cleome support
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