Bacteria

Q.

In algae, aplanospores are produced during a)favourable conditions b)unfavourable conditions c)mild conditions d)both a) and b)

Q.

Give the classification of bacteria based on the arrangement and number of flagella.

Q.

Explain the difference between symbiotic relationship and non symbiotic relationship

Q.

Why are cyanobacteria called blue-green algae?

Q.

What is the difference between pathogenic and Non- pathogenic bacteria?

Q. What is saprophytic? Explain

Q. Which of the following is not correctly matched for the organism and its cell wall degrading enzyme?

1. Bacteria - Lysozyme
   
2. Fungi - Chitinase
   
3. Algae - Methylase
4. Plant cells - Cellulase

Q.

By which organism is toddy fermented?

Q. If there were no cyanobacteria in the primitive earth, which of the following gases would not have evolved?

1. Oxygen
2. Methane
3. Hydrogen
4. Ammonia

Q.

Membrane-bound organelles are absent in?

1. Saccharomyces

2. Chlamydomonas

3. Streptococcus

4. Plasmodium

Q. The following table shows certain diseases, their causative organisms and symptoms. Fill the gaps.

	Name of the disease	Causative agent	Symptoms
(i)	Ascariasis	Ascaris
(ii)		Trichophyton	Appearance of dry scaly lesions on various parts of the body
(iii)	Typhoid		High fever, weakness, headache, stomach pain, constipation
(iv)	Pneumonia	Streptococcus pneumoniae
(v)		Rhinoviruses	Nasal congestion and discharge, sore throat, cough and headache
(vi)	Filariasis		Inflammation in lower limbs

Q. Match the following diseases with the causative organism and select the correct option.

	Column I		Column II
(a)	Typhoid	(i)	Wuchereria
(b)	Pneumonia	(ii)	Plasmodium
(c)	Filariasis	(iii)	Salmonella
(d)	Malaria	(iv)	Haemophilus

1. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
3. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
4. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

Q.

Is mesosomes present in all bacteria?

Q. Haemozoin is a ____.

Q. N-acetyl glucosamine (NAG) and N-acetyl muramic acid (NAM) is found in cell walls of

1. Protists
2. Bacteria
3. Plants
4. Fungi

Q. Which organism is not an example of a eukaryotic cell?

1. Amoeba proteus
2. Paramecium caudatum
3. Escherichia coli
4. Euglena viridis

Q. The causative agent of filariasis is

1. Wuchereria bancrofti
2. Leishmania donovani
3. Plasmodium vivax
4. Trypanosoma gambiense

Q. Curing of tea leaves is brought about by the activity of

1. mycorrhiza
2. fungi
3. viruses
4. bacteria

Q.

One of the free-living anaerobic nitrogen-fixer is?

1. Rhizobium

2. Azotobacter

3. Rhodospirillum

4. Beijernickia

Q.

A free living anaerobic nitrogen fixer is

1. Beijernickia

2. Rhodospirillum

3. Rhizobium

4. Azotobacter

Q.

Who discovered the first human virus in 1901?

Q. Assertion :Mycoplasmas are pathogenic in animals and plants. Reason: Mycoplasmas lack cell wall and can survive without oxygen.

1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true but reason is not the correct explanation of assertion.
3. If assertion is true but reason is false.
4. If both assertion and reason are false.

Q. Lysozyme that is present in saliva and tears destroys

1. Certain fungi
2. Certain types of bacteria
3. All viruses
4. Most virus infected cells

Q.

In which bacteria flagella is absent?

Q. Fungi are filamentous with the exception of "X" which is unicellular. Identify X.

1. Yeast
2. Mucor
3. Albugo
4. Lichen

Q. Chromosomes in a bacterial cell can be 1 - 3 in number and :

1. Are always circular
2. Can be circular as well as linear within the same cell
3. Are always linear
4. Can be either circular or linear, but never both within the same cell

Q.

All of the following statements concerning the Actinomycetes, filamentous soil bacterium Frankia are correct EXCEPT that Frankia

1. Forms specialized vesicles in which the nitrogenase is protected from oxygen by chemical barrier involving triterpene hopanoids

2. Can induce root nodules on many plant species

3. Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex

4. Cannot fix nitrogen in the free-living state

Q.

What are useful bacteria?

Q. Many bacteria have small circular DNA outside the genomic DNA. These smaller DNA are called

Q. Match column I with column II, and choose the correct combination from the options given below.

	column I		column II
a.	Haemophilus influenzae	p.	Virus
b.	Entamoeba histolytica	q.	Bacteria
c.	Plasmodium falciparum	r.	Protozoan
d.	Wuchereria bancrofti	s.	Nematode
e.	Salmonella typhi	t.	Fungus

1. a - p, b - t, c - r, d - q, e - s
2. a - p, b - r, c - t, d - q, e - s
3. a - t, b - p, c - r, d - s, e - q
   
   
4. a - q, b - r, c - r, d - s, e - q