shaalaa.com
S

NCERT solutions Biology Textbook for Class 12 chapter 14 Ecosystem

Account
User


Login
Register


      Forgot password?
Share
Notifications

View all notifications
Books Shortlist
Your shortlist is empty

Chapter 14 - Ecosystem

Pages 256 - 257

Fill in the blanks.

Plants are called as_________ because they fix carbon dioxide.

Q 1.1 | Page 256 | view solution

Fill in the blanks.

In an ecosystem dominated by trees, the pyramid (of numbers) is _________ type.

Q 1.2 | Page 256 | view solution

Fill in the blanks.

 In aquatic ecosystems, the limiting factor for the productivity is _________.

Q 1.3 | Page 256 | view solution

Which one of the following has the largest population in a food chain?

(a) Producers

(b) Primary consumers

(c) Secondary consumers

(d) Decomposers

Q 2 | Page 257 | view solution

The second trophic level in a lake is-

(a) Phytoplankton

(b) Zooplankton

(c) Benthos

(d) Fishes

Q 3 | Page 257 | view solution

Secondary producers are

(a) Herbivores

(b) Producers

(c) Carnivores

(d) None of the above

Q 4 | Page 257 | view solution

What is the percentage of photosynthetically active radiation (PAR), in the incident solar radiation.

(a) 100%

(b) 50 %

(c) 1-5%

(d) 2-10%

Q 5 | Page 257 | view solution

Distinguish between Grazing food chain and detritus food chain

Q 6.1 | Page 257 | view solution

Distinguish between Production and decomposition

Q 6.2 | Page 257 | view solution

Distinguish between Upright and inverted pyramid

Q 6.3 | Page 257 | view solution

Distinguish between Food chain and food web

Q 6.4 | Page 257 | view solution

Distinguish between Litter and detritus

Q 6.5 | Page 257 | view solution

Distinguish between Primary and secondary productivity

Q 6.6 | Page 257 | view solution

Describe the components of an ecosystem.

Q 7 | Page 257 | view solution

Define ecological pyramids and describe with examples, pyramids of number and biomass.

Q 8 | Page 257 | view solution

What is primary productivity? Give brief description of factors that affect primary productivity.

Q 9 | Page 257 | view solution

Define decomposition and describe the processes and products of decomposition.

Q 10 | Page 257 | view solution

Give an account of energy flow in an ecosystem.

Q 11 | Page 257 | view solution

Write important features of a sedimentary cycle in an ecosystem.

Q 12 | Page 257 | view solution

Outline salient features of carbon cycling in an ecosystem

Q 13 | Page 257 | view solution

Where to buy

165
-
170
-
S