Q2 of 52 Page 466

Weeds affect the crop plants by :

Weeds compete for food, space and light. They take up the plants nutrients and reduce the growth of the crop. They may sometimes produce toxic substances which may interfere with crop growth. During harvesting, weeds get mixed up with crop to lower down its quality. Hence statement C is correct.

More from this chapter

All 52 →
20

What is the composition of normal animal feed? What kind of feed promotes the health and milk output of dairy animals?

 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

 3

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

 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.