Monday, February 25, 2013

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

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

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

1 comment:

  1. Answer of question no. 4 is incorrect
    correct answer is Ecosystem