Question

Weeds affect the crops plants by
(a)Killing of plants in field before they grow
(b)Dominating the plants to grow
(c)Competing for various resources of crops causing low availability of nutrients
(d)All of the above

Answer 1

Hint: Any plants that are unwanted and grow along the main crop are known as weed Some broadleaf weed examples are clover, dandelion, and purslane. Grassy type weeds are nutsedge, pampas grass, and bermudagrass.

Complete answer:
Weed changes the natural diversity and balance of eco-communities. They compete with native plants for space, water, nutrients, and sunlight and threaten the survival of many plants. Weeds self-propagate and are not grown by a human.
Weeds are a problem as they may not be affected by the pests or diseases that normally control the natural growing plants. The different environment conditions provide different conditions that better suit the invading weed. This result in faster growth in weeds successfully gets the available nutrients, water, space, and sunlight. It reduces and sometimes replaces the natural diversity by smothering native plants or preventing them from growing back. Also, weeds are often magnificent at surviving and reproducing in a variety of environments. These are often the first species to colonize and dominate in these conditions. In a very short time, weeds spread wide areas in the ocean.
So, the correct answer is ‘All of the above’.

Note: There are three types of weeds annuals, biennials, and perennials. The first type is seasonal and has a life cycle of one year like crabgrass. They leave their seed which germinates in spring again. The second type remains for 2 years like cheese weed. The last type perennials, these live longer and can reproduce by seed, rhizomes, stolons, or bulblets like dandelions, Bermuda grass, and Kikuyu grass.