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You need to login to ask any Questions from chapter Ecosystem of Biology-MCQS

Chapter:

Ecosystem

1. Write scientific names of two species of filarial worms causing filariasis. How do y affect body of infected persons ? How does disease spread?

Lymphatic filariasis is caused by infection with parasites, Wuchereria bancrofti, Brugia malayi.
These worms occupy lymphatic system, including lymph nodes; in chronic cases, se worms lead to syndrome of elephantiasis.
Infection occurs when filarial parasites are transmitted to humans through mosquitoes.
Infection is usually acquired in childhood causing hidden damage to lymphatic system.

Hint Answer

2. What is meant by sensitisation of allergen?

When an allergen leaves the body The first contact of an allergen The incubation period of an allergen When symptoms of the disease appear

The first contact of an allergen

The allergen on first contact functions as a mild antigen. This process is called sensitisation. It produces antibodies which remain attached to mast cells. These mast cells n release histamine and cause inflammatory responses in body.

Hint Answer

3. Adult Wuchereria bancrofti attacks:

Nervous system Lymph vessels Muscular system Blood vessels

Lymph vessels

Wuchereria bancrofti is a human parasitic roundworm that is major cause of lymphatic filariasis. It infects lymphatic system and blocks flow of lymph in peripheral lymphatic system that causes swelling of limbs and thus, called elephantiasis..
Thus, correct answer is option B.

Hint Answer

4. Define vaccines and name any two vaccines.

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of microbe, its toxins, or one of its surface proteins.

Eg. MMR, DPT vaccines

Hint Answer

5. What is mortality rate of humans if y contract rabies?

50% fatal 100% fatal No effects 33% fatal

100% fatal

Rabies is 100% fatal if neurological symptoms have developed like violent movements, uncontrolled excitement, inability to move parts of body, confusion and loss of consciousness. Once se symptoms appear, result is always death.

Hint Answer

6. Write two disadvantages of drinking alcohol in excess.

Drinking too much ? on a single occasion or over time ? can take a serious toll on your health. Here?s how alcohol can affect your body:

$\underline{B r a i n} :$
Alcohol interferes with brain?s communication pathways and can affect way brain looks and works. These disruptions can change mood and behavior, and make it harder to think clearly and move with coordination.

$\underline{H e a r t} :$
Drinking a lot over a long time or too much on a single occasion can damage heart, causing problems including:

1. Cardiomyopathy ? Stretching and drooping of heart muscle

2. Arrhythmias ? Irregular heart beat

3. Stroke

4. High Blood Pressure

$\underline{C a n c e r} :$
Drinking too much alcohol can increase your risk of developing certain cancers, including cancers of :

1. Mouth 2. Esophagus 3. Throat 4. Liver 5. Breast

$\underline{I m m u n e S y s t e m} :$
Drinking too much can weaken your immune system, making your body a much easier target for disease. Chronic drinkers are more liable to contract diseases like pneumonia and tuberculosis than people who do not drink too much. Drinking a lot on a single occasion slows your body?s ability to ward off infections ? even up to 24 hours after getting drunk.

Hint Answer

7. B-cells produce antibodies in response to instruction received from _____

Killer T-cells Suppressor T-cells Memory Cells Helper T-cells

Helper T-cells

B-cells produce antibodies in response to instruction received from Helper T-cells. Along with this, Helper T-cells also attract macrophages to site of infection.

Hint Answer

8. Which of following can make you ill if you come in contact with an infected person?

High blood pressure Genetic abnormalities Sneezing Blood cancer

Sneezing

Through sneezing, water droplets carrying microbes enter into healthy person. All ors are non communicable diseases.

Hence correct option is C.

Hint Answer

9. There is no immunization against

Measles Typhoid Smallpox Amoebiasis

Amoebiasis

One dose of MMR vaccine is 93% effective against measles, 78% effective against mumps, and 97% effective against rubella. MMR is an attenuated (weakened) live virus vaccine.
Vivotif (Typhoid Vaccine Live Oral Ty21a) is a live attenuated vaccine for oral administration only. The vaccine contains attenuated strain Salmonella typhi.
The smallpox vaccine protects people from smallpox by helping ir bodies develop immunity to smallpox. The vaccine is made from a virus called vaccinia.
One approach is to develop a vaccine to prevent this deadly disease. Clinical studies indicate that mucosal immunity may provide some protection against recurrent intestinal infection with E. histolytica, but re is no clear evidence that protective immunity develops after amoebic liver abscess.

So, correct option is 'Option D'.

Hint Answer

10. In Myasnia gravis, antibodies start attacking __________

Proprioceptors Chemoreceptors Acetylcholine receptors Cortisol receptors

Acetylcholine receptors

In Myasnia gravis, antibodies start attacking acetylcholine receptors present on sarcolemma, due to which neurotransmitter i.e. acetylcholine could not bind to its receptors and hence, could not initiate nerve transmission. The skeletal muscles of patient become weak and lead to paralysis.

Hint Answer

Nexttt

Guest You need to login to ask any Questions from chapter Ecosystem of Biology-MCQS

Chapter:

The first contact of an allergen

Lymph vessels

100% fatal

Helper T-cells

Sneezing

Amoebiasis

Acetylcholine receptors

All Chapters

The Living World

Biological Classification

Plant Kingdom

Animal Kingdom

Morphology of Flowering Plants

Anatomy of Flowering Plants

Structural Organisations in Animals

Cell : The Unit of Life

Biomolecules

Cell Cycle and Cell Division

Transport in Plants

Mineral Nutrition

Photosynthesis in Higher Plants

Respiration in Plants

Plant Growth and Development

Digestion and Absorption

Breathing and Exchange of Gases

Body Fluids and Circulation

Excretory Products and Elimination

Locomotion and Movement

Neural Control and Coordination

Chemical Control and Coordination

Reproduction in Organisms

Sexual Reproduction in Flowering Plants

Human Reproduction

Reproductive Health

Principles of Inheritance and Variation

Molecular Basis of Inheritance

Evolution

Human Health and Disease

Strategies for Enhancement in Food Production

Microbes in Human Welfare

Biotechnology Principles and Processes

Biotechnology and its Applications

Organisms and Populations

Ecosystem

Biodiversity and Conservation

Environmental Issues

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Biology mcqs

Write scientific names of two species of filarial worms causing filariasis. How do y affect body of infected persons ? How does disease spread?

What is meant by sensitisation of allergen?

Adult Wuchereria bancrofti attacks:

Define vaccines and name any two vaccines.

What is mortality rate of humans if y contract rabies?

Write two disadvantages of drinking alcohol in excess.

B-cells produce antibodies in response to instruction received from _____

Which of following can make you ill if you come in contact with an infected person?

There is no immunization against

In Myasnia gravis, antibodies start attacking __________

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You need to login to ask any Questions from chapter Ecosystem of Biology-MCQS