Biology MCQs Test P 38

Cycas

1. In Cycas, the fern characteristic is

(a) reticulate venation

(b) circinate venation

(c) taproot system

(d) coralloid roots

Answer: (b)

2. In Cycas, the spermatozoid is

(a) Multiciliated

(b) uniflagellate

(c) non flagellate

(d) biflagellate

Answer: (a)

3. The stem of the Cycas is a source of edible starch known as

(a) sigo

(b) cycas starch

(c) sago

(d) cyco

Answer: (c)

4. The Cycas has

(a) oil ducts

(b) resin ducts

(c) laticiferous vessels

(d) mucilage ducts

Answer: (d)

5. The largest sperms are found in this plant

(a) Pinus

(b) Sunflower

(c) Mango

(d) Cycas

Answer: (d)

6. __________ is a connecting link between gymnosperms and angiosperms

(a) Cycadales

(b) Ginkgoales

(c) Coniferales

(d) Gnetales

Answer: (d)

7. In Cycas, the endosperm is a

(a) post fertilization product and diploid

(b) post fertilization product and haploid

(c) pre fertilization product and diploid

(d) pre fertilization product and haploid

Answer: (d)

8. This is considered to be a living fossil

(a) Podocarpus

(b) Zamia

(c) Cycas

(d) Pinus

Answer: (c)

9. The reason why Cycas is not classified under dicotyledons plants even though it has an embryo with two cotyledons is

(a) it appears as a palm tree

(b) it possesses megasporophyll

(c) has compound leaves

(d) its ovules are naked

Answer: (d)

10. This is the most commonly occurring ornamental species of Cycas

(a) Cycas revoluta

(b) Cycas beddomei

(c) Cycas circinalis

(d) Cycas rumphii

Answer: (a)

Sporulation

1. The daughter cells that are formed when the septum forms near the poles of the cell is known as

(a) daughter cell

(b) macrocell

(c) minicell

(d) microcell

Answer: (c)

2. _____________ is also used to address lag phase

(a) generation time

(b) transitional period

(c) period of initial adjustment

(d) none of the above

Answer: (c)

3. This can best describe a microbial control protocol inhibiting the growth of molds and yeasts

(a) fungistatic

(b) bactericidal

(c) fungicidal

(d) bacteriostatic

Answer: (a)

4. In gram-positive cells, during its reproduction, synthesis of new membrane material is carried out by this organelle

(a) cytoplasmic membrane

(b) endoplasmic reticulum

(c) mesosome

(d) nucleus

Answer: (c)

5. A fold or bleb like formation is seen in this bacteria

(a) E.coli

(b) Bacillus subtilis

(c) Rhodopseudomonas acidophila

(d) Streptococcus faecalis

Answer: (a)

6. This is not a characteristic of a growth curve

(a) every growth curve has 4 distinct stages

(b) Graph numbers of microbes versus time

(c) plotted with logarithmic numbers

(d) under relatively stable environmental conditions, development of microbial population is seen

Answer: (a)

7. Spores produced endogenously are found in all except this

(a) Rhizopus

(b) Mushroom

(c) Mucor

(d) Albugo

Answer: (b)

8. _____________ is used to refer to the growth of bacteria or microbes

(a) increase in the number of cells

(b) change in the total population

(c) increase in the mass of an individual entity

(d) increase in the size of an individual entity

Answer: (a)

9. In bacteria, sporulation takes place in this growth phase

(a) phase of decline

(b) log phase

(c) lag phase

(d) stationary phase

Answer: (d)

10. Rhodopseudomonas acidophila follows this mode of reproduction

(a) Budding

(b) Sporulation

(c) Fragmentation

(d) Binary fission

Answer: (a)

Cytokinins

1. This causes delay in senescence

(a) ascorbic acid

(b) gibberellins

(c) auxins

(d) cytokinins

Answer: (d)

2. ___________ is a coconut milk factor

(a) cytokinin

(b) morphactin

(c) auxin

(d) none of these

Answer: (a)

3. Which of these can prevent the falling of leaves

(a) abscisic acid

(b) cytokinins

(c) auxin

(d) florigen

Answer: (b)

4. The first one to synthesize cytokinin was

(a) Thimman and Went

(b) Calvin and Bensan

(c) Letham

(d) Skoog and Miller

Answer: (d)

5. This hormone prevents the crop from falling

(a) ethylene

(b) auxin

(c) gibberellin

(d) cytokinin

Answer: (b)

6. The cambial tissue of Pinus radiata has

(a) cytokinin

(b) gibberellins

(c) auxins

(d) none of these

Answer: (a)

7. This is capable of delaying yellowing of leaves

(a) auxins

(b) ABA

(c) cytokinins

(d) gibberellins

Answer: (c)

8. In a culture medium, the use of an old sample of DNA is associated with the discovery of which of these?

(a) ABA

(b) Cytokinins

(c) Pantothanic acid

(d) Vitamin K

Answer: (b)

9. The hormone Cytokinin has the main function of

(a) causing dormancy

(b) cell movement

(c) participating in cell division

(d) induction of cell division and delay in senescence

Answer: (d)

10. This plant hormone is responsible for the ripening of fruits

(a) Cytokinins

(b) Auxin

(c) Ethylene

(d) None of the above

Answer: (c)

Marasmus

1. Which disorder are kids of age below one year more likely to suffer from if breastfeeding is replaced by foods low in calories and proteins?

(a) Rickets

(b) Kwashiorkor

(c) Marasmus

(d) Pellagra

Answer: (c)

2. The deficiency of protein alone is a symptom of

(a) Protemia

(b) Indigestion

(c) Kwashiorkor

(d) Marasmus

Answer: (c)

3. This is a feature of marasmus and not Kwashiorkor

(a) Edema

(b) Voracious appetite

(c) Hypoalbuminemia

(d) Fatty change in liver

Answer: (b)

4. Marasmus is not characterized by

(a) swelling of limbs

(b) replacing tissue proteins

(c) impaired growth

(d) protein deficiency

Answer: (a)

5. There is a considerable decline in the weight of the body and growth rate along with the mental faculties getting impaired. Which of these diseases are associated with the mentioned symptoms?

(a) Epilepsy

(b) Indigestion

(c) Kwashiorkor

(d) Marasmus

Answer: (d)

6. This is a common feature of Kwashiorkor and Marasmus

(a) thinning of limbs

(b) failure of development of brain and growth

(c) wasting of muscles

(d) all the above

Answer: (d)

7. Which is not a vitamin deficiency disease

(a) Cheilosis

(b) Scurvy

(c) Rickets

(d) Marasmus

Answer: (d)

8. If protein deficiency is seen in a child more than a year old, it may lead to

(a) Deficiency disorder

(b) Protemia

(c) Kwashiorkor

(d) Marasmus

Answer: (c)

9. Pick the incorrect statement about Marasmus

(a) pregnancy in lactation period

(b) protein rich diet replaces mother’s milk

(c) less than one year old infants are affected

(d) simultaneously deficiency of calories and proteins

Answer: (b)

10. Extensive oedema, fat underneath skin, swelling of parts of body are all associated with

(a) Kwashiorkor

(b) Marasmus

(c) Both

(d) Protemia

Answer: (a)

Restriction Enzymes

1. For cloning, restriction enzymes with sticky ends are used for

(a) ease of transformation

(b) easy insertion into plasmids of DNA segments from different sources

(c) easy identification of plasmids with antibiotic resistance

(d) easy identification of plasmids having inserts

Answer: (b)

2. The host controlled restriction is a process associated with

(a) gene of interest

(b) bacteria

(c) plasmid

(d) viruses

Answer: (b)

3. How many bases does the sequence which identifies the restriction enzymes contain?

(a) 1

(b) 4

(c) 6

(d) 12

Answer: (c)

4. The restriction enzymes bind to and cut the sequences of DNA which usually are

(a) antiparallel

(b) not symmetrical about the midpoint

(c) symmetrical about the midpoint

(d) random sequences

Answer: (c)

5. In bacteria, the restriction phenomena occurs naturally as

(a) bacteria produces enzyme

(b) for survival

(c) for efficient cloning

(d) destruction of DNA of the bacterium

Answer: (a)

6. Restriction enzymes are isolated from

(a) Virus

(b) Fungi

(c) Protozoa

(d) Bacteria

Answer: (d)

7. Joining and cutting DNA are these techniques

(a) DNA synthesis

(b) DNA degradation

(c) DNA manipulation

(d) DNA replication

Answer: (c)

8. For the production of a DNA copy, the enzyme which uses RNA is called

(a) DNA polymerase

(b) RNA polymerase

(c) DNA ligase

(d) reverse transcriptase

Answer: (b)

9. This was the first restriction endonuclease that was discovered

(a) BamHI

(b) EcoRI

(c) HindIII

(d) HindII

Answer: (d)

10. This is not a cloning factor

(a) pUC19

(b) SV40

(c) EST

(d) M13

Answer: (c)

Climate

1. In terms of efficiency, the most potent greenhouse gas is

(a) N2O

(b) CH4

(c) C2O

(d) CFC

Answer: (d)

2. This ecological factor is the strongest determinant of different biomes

(a) wind and soil

(b) precipitation and temperature

(c) wind and light

(d) humidity and pH

Answer: (b)

3. On the ozone layer, the CFC has continuing effect as

(a) Reactions use up by the Cl atoms formed by them leading to the degradation of ozone

(b) their efficient absorption by water vapours of the atmosphere

(c) In reactions, the Cl atoms formed by them serve as catalysts leading to the degradation of ozone

(d) they are constantly produced in increasing quantities, globally

Answer: (c)

4. Regions having severe and long winters and growing season consists of a few months of summers represent

(a) Tundra ecosystem

(b) Taiga ecosystem

(c) Savannah ecosystem

(d) None of these

Answer: (a)

5. This is the wavelength of infrared radiations

(a) zero

(b) infinite

(c) longer

(d) shorter

Answer: (c)

6. This is not one of the possible adverse effects of the phenomena of global warming

(a) extraordinary weather patterns

(b) retreat of glaciers

(c) an increase of UVB radiations

(d) rise in the sea levels

Answer: (c)

7. Identify the phenomena taking place in this statement – Climate system is affected due to an increasingly large quantity of gas molecules absorbing thermal infrared radiations.

(a) alpha radiations

(b) ozone gases

(c) beta radiations

(d) greenhouse gases

Answer: (d)

8. The reason why presence of ample carbon dioxide causes an increase in the greenhouse effect is because carbon dioxide

(a) reduces atmospheric pressure

(b) precipitates atmospheric dust

(c) is not opaque to infrared rays

(d) is opaque to infrared rays

Answer: (d)

9. Identify the incorrect statement

(a) Eutrophication is a natural process seen in fresh water bodies

(b) Greenhouse effect occurs naturally

(c) In the upper part of the atmosphere, ozone causes harm to animals

(d) In tropical areas, most of the forests have been lost

Answer: (c)

10. The phenomena instrumental in eliminating atmospheric carbon dioxide is

(a) burning of fossil fuels

(b) deforestation

(c) photosynthesis

(d) lightning

Answer: (c)