* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Crops and Weeds
Evolutionary history of plants wikipedia , lookup
History of botany wikipedia , lookup
Gartons Agricultural Plant Breeders wikipedia , lookup
Plant stress measurement wikipedia , lookup
Ornamental bulbous plant wikipedia , lookup
Plant nutrition wikipedia , lookup
Plant secondary metabolism wikipedia , lookup
Plant defense against herbivory wikipedia , lookup
Plant evolutionary developmental biology wikipedia , lookup
Plant physiology wikipedia , lookup
Plant use of endophytic fungi in defense wikipedia , lookup
Plant morphology wikipedia , lookup
Plant reproduction wikipedia , lookup
Plant breeding wikipedia , lookup
Plant ecology wikipedia , lookup
Glossary of plant morphology wikipedia , lookup
Sustainable landscaping wikipedia , lookup
Crops and Weeds Here is a picture of a wild grassland plant and its special features. A. B. C. D. E. F. G. H. I. It is resistant to herbicides. It has spiny leaves. Its has a large, deep root. Its leaves contain chemicals that make them taste unpleasant. Viruses, fungi and bacteria live in it. It grows and flowers very quickly. Its leaves spread out and catch sunlight. Its seedlings germinate quickly. It makes lots of seeds in fruits that are easily spread large distances and can live in the soil for many years. J. The roots release chemicals that prevent growth of other plants. K. Insects live on the weed. Match the special features with these reasons why farmers call the plant a weed. Reason Cows and sheep do not eat it It slows down the growth of grass plants near to it. It spreads into a field when the grass is re-seeded. Pests move from the plant onto crops. It is very hard to get rid of. Features Here are some common weeds and the average number of seeds that each plant can produce. Weed Groundsel Chickweed Poppy Average seeds per plant 1100 2400 1750 1) Which weed produced most seeds per plant? 2) Groundsel produces seeds in a very light fruit with long, feathery hairs. How do you think that these seeds get into a newly ploughed field? 3) Poppy plants have become much less common in fields. Can you suggest what farmers are doing to cause this? The table below shows the effect of weeds on the yield of a crop. Number of weed plants in the crop 10 150 450 Yield of the crop (g) 23.8 1.8 0.7 4) What is the effect of weeds on the crop? 5) Suggest 3 reasons why this happens. 9d5c