Q3 of 52 Page 466

Which one of the following species of honey bee is an Italian species?

An Italian bee called Apis mellifera is a species of honey bee. It has been used to increase the yield of honey because:


a) They have high honey collection capacity.


b) They can stay in a beehive for much longer period and show higher rate of breeding

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1

Find out the correct sentence:

(i) Hybridization means crossing between genetically dissimilar plants


(ii) Cross between two varieties is called as interspecific hybridization


(iii) Introducing genes of desired character into a plant gives genetically modified crop


(iv)Cross between plants of two species is called as inter-varietal hybridization

 2

Weeds affect the crop plants by :

 4

Find out the correct sentence about manure :

(i) Manure contains large quantities of organic matter and small quantities of nutrients.


(ii) It increases the water holding capacity of sandy soil.


(iii) It helps in draining out of excess of water from clayey soil


(iv) Its excessive use pollutes environment because it is made of animal excretory waste.

 5

The major groups of activities for improving crop yields can be classified as :