Observe this figure and answer the questions given below: Name the part labelled as ‘1’. Name the heredity material of this virus. The person infected by this virus is attacked by various diseases.’ Explain.

1. Enzyme: An enzyme is a substance that acts as a catalyst in living organisms, regulating the rate at which chemical reactions proceed without itself being altered in the process. The enzyme present in the virus is called reverse transcriptase. Reverse transcriptase (RT) is a DNA polymerase enzyme that transcribes single-stranded RNA into DNA. 2. RNA: Ribonucleic acid (RNA) is a molecule similar to DNA. Unlike DNA, RNA is single-stranded. Deoxyribonucleic acid, or DNA, is a biological macromolecule that carries hereditary information in many organisms. 3. The virus shown in the above figure is the Human Immunodeficiency Virus (HIV) virus HIV is a virus that attacks the immune system. The immune system fights infections and diseases in a person's body. Over time, HIV weakens a person's immune system, so the body becomes susceptible to diseases.

A telescope is an optical instrument designed to make distant objects like stars, planets, appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.

Answer the following questions and arrange the letters you get inside the coloured boxes in the order given below the questions to spell out the name of a famous bacteriologist. Instrument required to view microbes- Amoeba divides by _____ fission. Chlorella propagates by producing special cells called _____. An organism that lives on or within the bodies of other organisms, affecting them adversely _____. A viral disease- Yeast has a cell wall made of _____. The name is

Instrument required to view microbes is known as a microscope. It is made up of magnifying lens where the tiny microbes which are naked to our eyes are observed in this. Amoeba is a unicellular eukaryotic organism. It is irregular in shape and reproduces through an asexual reproductive method called binary fission. Chlorella is a unicellular green alga which is seen in stagnant water or in soils rich in organic matter. A thin cell wall encloses a single cup-shaped chloroplast and a centrally placed nucleus. These reproduce by forming special cells called spores. An organism that lives on or within the bodies of other organisms, affecting them adversely is parasites. Viruses are one of the types which require a host body to replicate and to survive. Viruses are the intracellular obligate parasites which are active inside the host body. These causes diseases like AIDS, mumps, chickenpox, poliovirus, etc. Chickenpox is also known as varicella, is a highly contagious disease caused by the Varicella zoster virus. Yeast is unicellular eukaryotic fungi. These are reproduced by the budding method. Yeast cells are oval in shape with the prominent vacuole, a nucleus, mitochondria and stored food in the form of glycogen. The body is made up of a hard layer called chitin. The identified scientist name is Robert Koch. He was well known in microbiology. He was the one who discovered the bacteria that causes anthrax ( Bacillus anthracis ), septicaemia, tuberculosis, etc.

EASY

Earn 100

Microorganisms can be seen with the help of a .

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Important Questions on Microorganism Friend and Foe

EASY

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Which enzyme is present in yeast?

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

By considering the first correlation complete the second correlation:
Hubble telescope:

569 km

high from earth surface:: Revolving orbit of Hubble telescope: _____. (high earth orbit/ low earth orbit)

HARD

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Observe this figure and answer the questions given below:

Question Image

Name the part labelled as ‘1’.
Name the heredity material of this virus.
The person infected by this virus is attacked by various diseases.’ Explain.

EASY

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Discuss the action of a Bainbridge mass spectrometer to determine the isotopic masses.

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Mention any two achievements of Hubble Telescope.

MEDIUM

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Explain emission and absorption spectra ( Diagram not necessary)

MEDIUM

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Question Image

The image is magnified x 400. What does this mean?

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

For testing of blood _____ is used.

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Lana is looking at a book with a picture of E. coli bacteria. The bacteria in the image are magnified

\times

10 000. What does this mean?

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

List the uses of a simple microscope.

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

We study microbes with the help of a

MEDIUM

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Draw a ray diagram to illustrate the action of a convex lens as magnifying glass.

HARD

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

What is a telescope?

MEDIUM

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Why was an electron microscope been used and not a light microscope?

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

To see distant object _____ lens is used.

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Microorganisms are very small. Name the piece of apparatus needed to view microorganisms.

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Examine the lenses in a compound microscope. Are they convex or concave lenses?

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Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Give a one-word answer:

What piece of apparatus do you need to study microorganisms?

MEDIUM

Science>Biology>Microorganism Friend and Foe>Introduction to Microorganisms

Answer the following questions and arrange the letters you get inside the coloured boxes in the order given below the questions to spell out the name of a famous bacteriologist.

Instrument required to view microbes-
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