Monday, February 25, 2013

CBSE Class 10 - Science - CH 15 - Our Environment (MCQs)

Our Environment
CBSE Class 10 - Science - CH 15 - Our Environment (MCQs)

(MCQs)

Q1: What percentage of sunlight is captured by plants to convert it into food energy?

(a) 1%
(b) 10%
(c) 50%
(d) more than 50%


Q2: Flow of energy in an ecosystem is  always

(a) unidrectional
(b) bidrectional
(c) multidirectional
(d) none of these


Q3:Which of the following is non-biodegradable?

(a) Tea leaves
(b) Nylon
(c) remains of animals
(d) fleece of sheep




Q4: The structural and functional unit of  the environment is known as:

(a) ecosystem
(b) biosphere
(c) food chain
(d) food web


Q5: Depletion of ozone layer is mainly due to

(a) Methane
(b) Carbon Dioxide
(c) ChloroFloroCarbons
(d) Nitrogen


Q6: First order consumers are:

(a) Carnivores
(b) Herbivores
(c) Decomposers
(d) Omnivores


Q7:  A detritus food chain begins with

(a) Carnivores
(b) Herbivores
(c) Omnivores(d) Decomposers


Q8(NCERT): In an ecosystem, the 10% of energy disposable for transfer from one trophic lcvel to next is in the form of

(a) heat energy
(b) chemical energy
(c) mechanical energy
(d) light energy


Q9(NCERT): Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

(a) eutrophication
(b) pollution
(c) biomagnification
(d) accumulation


Q10: Which of the following is an abiotic component

(a) plants
(b) animals
(c) soil
(d) microorganisms


Q11(NCERT): Which of the statement is incorrect?

(a) All green plants and blue green algae are producers
(b) Green plants get their food from organic compounds
(c) Producers prepare their own food from inorganic compounds
(d) Plants convert solar energy into chemical energy


Q12: Edaphic factors are included in

(a) Abiotic components
(b) Biotic components
(c) Producers
(d) Consumers


Answers:
1: (a) 1%
2: (a) unidrectional
3: (b) Nylon
4: (c) food chain
5: (c) ChloroFloroCarbons
6: (b) Herbivores
7: (d) Decomposers
8: (b) chemical energy
9: (c) biomagnification
10: (c) soil
11: (b) Green plants get their food from organic compounds
12: (a) Abiotic components



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