CIE Biology Paper-4: Specimen Questions 97 - 99 of 120

Question number: 97

Essay Question▾

Describe in Detail

What is the difference between Racemose and Cymose?

Explanation

Table shows different pattern of arrangement of flower

Given table shows difference between Racemose and cymose

Racemose

Cymose

It is also called as Indefinite inflorescence

It is called as Definite inflorescence

The growing point seldom ends in a flower

The growing point always forms a flower

The arrangement of flower is acropetal

The actual arrangement of flower is basipetal

Shoes given image of racem ose

Shoes given image of racem ose

showinf image of racem ose

shows image of cym ose

shows image of cym ose

showing given above image of cym ose

Question number: 98

Essay Question▾

Describe in Detail

What is the main difference between GMO (genetically modified organisms) and hybrid?

Explanation

Table shows difference between GMO and hybrid

Table shows how genetically modified organisms are differ from hybrid

genetically modified organisms

hybrid

Production of GMP does not use crossing between different organisms

Hybrids form due to crossing between two different organisms

One or more genes are incorporated in GMO

Hybrid have complete genome of two different organisms

New character form

In hybrids only the existing traits are improved

Question number: 99

Essay Question▾

Describe in Detail

What is the role of productivity in an ecosystem. How net primary productivity is different from gross primary productivity

Explanation

The rate of synthesis of organic compounds by any trophic level per unit area and per unit time is called as productivity and the study of productivity is called as production ecology. Productivity can be of two types –primary productivity and secondary productivity.

In primary productivity the amount of energy accumulation in plants as organic matter through the process of photosynthesis per unit time and per unit area. In addition, when the rate of synthesis of organic matter by the consumer it is called as secondary productivity. Primary productivity may be of two types-

(i) Net primary productivity

(ii) Gross primary productivity

Table shows difference between NPP and GPP

Table shows difference between Net primary productivity and gross primary productivity

(i) Net primary productivity

(ii) Gross primary productivity

Amount of organic matter store by producers

Amount of organic matter synthesize by producers

It is equal to the organic matter make in photosynthesis minus utilization in respiration and other loss

It is equal to the rate of increase in body weight of producer plus loss due to respiration and damage

It depend on GPP

It depends upon photosynthetic efficiency of producers, availability of solar energy

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