What two features of dugesia distinguish its anterior end from its posterior end?

What two features of dugesia distinguish its anterior end from its posterior end?

The anterior end of the body is the head and the remainder is the trunk. Dugesia tigrina has a pointed triangular head but the head of many planarians is blunt and rounded. The posterior limit of the head is marked by the auricles, a pair of lateral, chemosensory protrusions.

How does the number of body cavities of nematodes compare with that of flatworms?

How does the number of body cavities of nematodes compare with that of flatworms? The number of body cavities of nematodes compared to flatworms differ because nematodes are not segmented while flatworms have a head, a segmented body, and a tail.

Are there any sensory organs evident in Ascaris?

Q: Is there any evidence of sensory organs in Ascaris? A: Both of the worms are parasitic, with no sensory organs, only posessing digestive and reproductive organs.

What sensory organ is unique to nematodes?

The bodies of nematodes are covered in numerous sensory bristles and papillae that together provide a sense of touch. Behind the sensory bristles on the head lie two small pits, or ‘amphids’. These are well supplied with nerve cells and are probably chemoreception organs.

How do I get rid of nematodes?

Freezing temperatures and dry, cold wind help kill surviving nematodes. Don’t bring nematode-infested plants into your garden. Look at the roots of tomato and pepper plants before planting them. Plants with galls should not be set out.

Do humans carry nematodes?

Nematode infections in humans include ascariasis, trichuriasis, hookworm, enterobiasis, strongyloidiasis, filariasis, trichinosis, dirofilariasis, and angiostrongyliasis (rat lungworm disease), among others.

What to plant to get rid of nematodes?

Using Plants for Nematode Control

1. Painted Daisy – kills nematodes when used as a green manure.
2. French Marigold – kills nematodes when used as a green manure.
3. Dahlia – repels nematodes.
4. Castor Bean – kills nematodes when used as a green manure.
5. Partridge Pea – reduces populations of peanut root knot nematode.

What are the symptoms of nematodes?

Since most plant nematodes affect root functions, most symptoms associated with them are the result of inadequate water supply or mineral nutrition to the tops: chlorosis (yellowing) or other abnormal coloration of foliage, stunted top growth, failure to respond normally to fertilizers, small or sparse foliage, a …

What is the life cycle of nematodes?

Abstract. The life cycle of nematodes consists of six stages or instars: the egg (or embryo), four juvenile stages (Jl, J2, J3, J4) and the adult (Figure 6.1). All nematodes possess this basic pattern. The immature stages have been called ‘juveniles’ by plant nematologists and ‘larvae’ by animal helminthologists.

Do nematodes kill earthworms?

They don’t hurt earthworms either. What types of pest problems will beneficial nematodes help control? The specific type of nematode you buy for garden use targets any garden pest that has a larval stage in the soil.

How do you prevent and avoids the possible infestation of these nematodes?

Prevent nematodes from entering your garden by using only nematode-free plants purchased from reliable nurseries. To prevent the spread of nematodes, avoid moving plants and soil from infested parts of the garden. Don’t allow irrigation water from around infested plants to run off, as this also spreads nematodes.

What nematode produces the most eggs?

Ascaris lumbricoides is found in the small intestine, particularly the jejunum. Females produce as many as 240,000 eggs per day and as many as 65 million in a lifetime.

What is the biggest human parasite?

The tapeworm, which goes by the scientific name Taenia solium, was nearly 2 meters (6.6 feet) long. In fact, it was the longest worm that Dr. Cyriac Philips, a liver specialist at PVS Memorial Hospital in India who treated the man, had ever seen, he said.