Q.1 Name two cells organelles that contain their own genetic material?
Q.2 Which tissues make up the husk of coconut?
Q.3 Draw a labelled diagram of neuron.
Q.4 Why is plasma membrane called a selectively permeable membrane?
OR
What is osmosis.
Q.5 What is immunisation?
Answers
Answer:
Q.1 Mitochondria and Plastids
Q.2 Sclerenchyma
Q.3 The neuron is a specialized and individual cell, which is also known as the nerve cell. A group of neurons forms a nerve. Dendrites–A branch-like structure that functions by receiving messages from other neurons and allow the transmission of messages to the cell body.
Q.4 The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells.If plasma membrane ruptures or breaks down then molecules of some substances will freely move in and out of the cells.
OR
Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
Q.5 Immunization is the process whereby a person is made immune or resistant to an infectious disease, typically by the administration of a vaccine. Vaccines stimulate the body’s own immune system to protect the person against subsequent infection or disease.
Immunization is a proven tool for controlling and eliminating life-threatening infectious diseases and is estimated to avert between 2 and 3 million deaths each year. It is one of the most cost-effective health investments, with proven strategies that make it accessible to even the most hard-to-reach and vulnerable populations. It has clearly defined target groups; it can be delivered effectively through outreach activities; and vaccination does not require any major lifestyle change.
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Explanation:
Answer:
Q1.Mitochondria and plastids are the two organelles that contain their own genetic material. Both these organelles have their own DNA and ribosomes.
Q2.Sclerenchyma tissue makes up the husk of coconut.
Q3.research google
Q4.The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. ... As the plasma membrane acts as a mechanical barrier, the exchange of material from its surroundings through osmosis or diffusion in a cell won't take place.
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Q5.
Definitions
Immunisation describes the process whereby people are protected against illness caused by infection with micro-organisms (formally called pathogens).
The term vaccine refers to the material used for immunisation, while vaccination refers to the act of giving a vaccine to a person.
Immunity describes the state of protection that occurs when a person has been vaccinated or has had an infection and recovered.
Vaccination, like infection, confers immunity by interaction with the immune system.
The term micro-organism refers to infectious agents that can only been seen under the microscope and here covers bacteria, viruses, fungi and protozoa.
Antigens are the components/fragments from pathogens or their toxins.
Explanation: