Ergot of rye is caused by a species of:

  • Phytophthora

  • Uncinula

  • Ustilago

  • Claviceps

True nucleus is absent in

  • Anabaena

  • Mucor

  • Vaucheria

  • Volvox

Cell wall is absent in

  • Aspergillus

  • Funaria

  • Mycoplasma

  • Nostoc

Which of the following statements regarding Euglenoids is not true?

  • Instead of a cell wall, they have a lipid rich pellicle

  • They have two flagella, a short and a long one

  • They are photosynthetic in the presence of sunlight but behave like a heterotroph when deprived of sunlight

  • Pigments of Euglenoids are identical to those present in higher plants

Identify the incorrectly matched pair:

  • Diatoms: Chief producers in oceans

  • Dinoflagellates: Red tides

  • Slime moulds: Spores dispersed by water

  • Euglenoids: Protein rich pellicle

The domain Archaea is not characterized by:

  • Pseudopeptidoglycan in cell wall

  • Linear chromosomes

  • Introns present is some genes

  • Methanogeneisis as unique metabolism

Members of Kingdom Protista:

  • are primarily aquatic 

  • do not have membrane bound organelles

  • are all ciliated or flagellated

  • reproduce exclusively by asexual means

In five kingdom classification, which single kingdom contains blue-green algae, nitrogen-fixing bacteria and methanogenic archaebacteria

  • Monera

  • Protista

  • Plantae

  • Fungi

In five-kingdom classification, unicellular green algae are included in the kingdom

  • Metaphyta

  • Protista

  • Monera

  • Metazoa

Fungi usually store the reserve food material in the form of

  • Starch 

  • Glycogen and oil

  • Lipid

  • Protein

Consider the following regarding the reasons for the fact that now Cyanobacteria are kept in Monera and not in Plantae:

I. They are prokaryotes.

II. The cell wall of cyanobacteria has peptidoglycan.

III. They can fix atomspheric nitrogen

The correct explanations would be:

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

Thermococcus, Methanococcus and Methanobacterium exemplify

  • archaebacteria that contain protein homologous to eukarytic core histones

  • archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled

  • bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria

  • bacteria that contain a cytoskeleton and ribosomes

Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?

  • Casuarina equisetifolia

  • Crotolaria juncea

  • Cycas revoluta

  • Cicer arietinum

Which of the following are valid pointers to the demerits of the two kingdom classification proposed by Linnaeus?

I. Euglena has features both of plants and animals.

II. Chlamydomanas is autotrophic but has flagella.

III. Slime molds resemble animals in one phase of their life cycle and plants in the other phase.

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

Identify the group that is not matched correctly to all the characters shown
  • 1
  • 2
  • 3
  • 4

Math Column I with Column II and choose your answer from the codes given:

 

Column I (Bacterium)

 

Column II (shape)

I.

Escherechia coli

1.

Spherical

II. 

Streptococcus pyogenes   

2. 

Helically coiled

III. 

Treponema pallidum

3.

Rod shaped

 

I  

II

III

(1)

3

(2)

3

1

2

(3)

3

2

1

1

3

2

  • 1    

  • 2    

  • 3

  • (4)  

Identify the incorrect statement regarding bacteria:

 

  • Bacteria are the most abundant micro-organisms.

  • Bacteria live in extreme habitats where very few other life forms can survive.

  • Bacteria as a group show the most extensive metabolic diversity.

  • They are obligate intracellular parasites.

Consider the following statements regarding characters of Archaebacteria that they share with eukaryotes:

I. The cell wall does not contain peptidoglycan.

II. DNA associated with histones.

III. Translation initiated with formylated methionine.

IV. RNA polymerase similar to eukaryotic RNA polymerase II

V. ATPase similarity

VI. Similar DNA replication and repair

How many of the above characters Archaebacteria share with eukaryotes?

  • 3

  • 4

  • 5

  • 6

Identify a character that is not unique to archaebacteria:

  • Flagellin protein structure

  • Fatty acid synthetase present

  • Cell wall structure

  • Cell membrane structure

Identify the incorrect statement regarding true bacteria?

  • As a group, they exhibit maximum metabolic diversity

  • Chemosynthetic autotrophic bacteria play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur.

  • Heterotrophic bacteria are the most abundant in nature.

  • Bacteria reproduce mainly by fission but sometimes under favourable conditions, they produce spores.

Consider the following statements regarding Mycoplasma:

I. They are a genus of bacteria that have a unique cell wall of their own.

II. In their genetic code UGA codes for tryptophan.

III. None of them is pathogenic to humans.

IV. They have a large genome.

V. They can be killed by penicillins.

VI. They can survive without oxygen

The number of correct statements is:

  • 1

  • 2

  • 3

  • 4

Diatoms have left behind large amount of cell wall deposits in their habitat because:

  • They are most abundant in that habitat

  • Their life span is long 

  • Their wall is indestructible

  • The statement is not true. 

Dinoflagellates:

I. Are mostly marine and photosynthetic.

II. Have a cell wall that has stiff cellulose plates on the outer surface.

III. Have two flagella

IV. Have chloroplasts bound by three membranes

The correct statements are:

  • I, II and III

  • I, III and IV

  • II, III and IV

  • I, II III and IV

Consider the following characters:

I. Heterotroph organisms

II. A dikaryon stage

III. Cell wall made of chitin

IV. Undergo nuclear mitosis

Which of the above relate to fungi?

  • I, II and III

  • I, III and IV

  • II, III and IV

  • I, II, III and IV

How many of the following statements regarding fungi are true?

I. Asexual reproduction is common by the formation of spores.

II. Their bodies consist of hyphae that many be interconnected to form mycelium.

III. They secrete digestive enzymes onto organic matter and then absorb the products of the digestion.

IV. Fungi can break down almost any carbon containing product.

V. Fungi do not enter symbiotic relationships.

  • 2

  • 3

  • 4

  • 5

Which of the following is not an edible mushroom?

  • Agaricus bispora

  • Pleurotus ostreatus

  • Lentinula edodes

  • Amantia phalloides

Consider the following characters:

I. Nuclear envelope

II. Membranes lacking sterols

III. 80s ribosomes

IV. split genes

The character not shared by fungi with other eukaryotes is/are:

  • II alone

  • IV alone

  • II and IV only

  • III and IV only 

Fungi resemble plants in:

  • Lack of chloroplasts and heterotrophic nutrition

  • Reproduction by only sexual means

  • Having a cell wall and vacuoles

  • Exhibition of bioluminiscence

Identify the characteristic that is unique to fungi:

  • Cell wall of glucans and chitin

  • Lack of chloroplasts and heterotrophic nutrition

  • Mannitol, trehalose and glycogen as storage products.

  • Having haploid nuclei and production of spores

What is not true for Mycorrhizae?

I. Nearly 30% of vascular plants have this symbiotic relationship with fungi.

II. The fungus primarily makes nitrogen available to plants.

III. Fungi get organic carbon from plants.

  • I alone

  • I and II only

  • II and III only

  • I, II and III

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