In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
Assertion (A): Offsprings produced by asexual reproduction are genetically identical to the parent.
Reason(R): Asexual reproduction involves only mitosis and no meiosis.
Codes:
A. If both A and R are true and R is correct explanation for A
B. If both A and R are true but R is not the correct explanation for A
C. If A is true but R is false
D. If both A and R are false.

(a)

both A and R are true and R is correct explanation for A

(b)

If both A and R are true but R is not the correct explanation for A

(c)

If A is true but R is false

(d)

If both A and R are false.

Assertion (A): Asexual reproduction is called blastogenic reproduction.
Reason (R): It is accomplished by mitotic and meiotic divisions.
Codes:
A. A and R are correct
B. A is correct but R is incorrect
C. Both A and R are incorrect
D. R is the correct explanation for A

(a)

A and R are correct

(b)

A is correct but R is incorrect

(c)

Both A and R are incorrect

(d)

R is the correct explanation for A

The most important hormone in intiating and maintaining lactation after birth is ______.

(a)

Oestrogen

(b)

FSH

(c)

Prolactin

(d)

Oxytocin

Select the incorrect action of hormonal contraceptive pills from the following

(a)

Inhibition of spermatogenesis.

(b)

Inhibition of ovulation

(c)

Changes in cervical mucus impairing its ability to allow passage and transport of sperms

(d)

Alteration in uterine endometrium to make it unsuitable for implantation

Which of the following approach does not give the defined action of contraceptive?

(a)

a) Barrier methods

Prevent fertilizers

(b)

b) Intra uterine devices

Increases phagocytosis of sperms suppresses sperm motility and fertilizing capacity of sperms.

(c)

c) Hormonal contraceptives

Prevent retard entry of sperms, prevent ovulation and fertilization.

(d)

d) Vasectomy

Prevents spermatogenesis

Down's syndrome is a genetic disorder which is caused by the presence of an extra chromosome number _____.

(a)

20

(b)

21

(c)

4

(d)

23

Which one of the following cannot be explained on the basis of Menders Law of Dominance?

(a)

The discrete unit controlling a particular character is called a factor

(b)

Out of one pair factors one is dominant and the other recessive

(c)

Alleles do not show any blending and both the characters recover as such in F2 generation

(d)

Factors occur in pairs

E. coli cell grown on ¹⁵N medium are transferred to ¹⁴N medium and allowed to grow for two generations. DNA extracted from these cells is ultracentrifuged in a cesium chloride density gradient. What density distribution of DNA would you expect in this experiment?

(a)

One high and one low density band

(b)

One intermediate density band.

(c)

One high and one intermediate density band.

(d)

One low and one intermediate density band

The association of histone H1 with a nudeosome indicates

(a)

Transcription is occurring

(b)

DNA replication is occurring

(c)

The DNA is condensed into chromatin fiber

(d)

The DNA double helix is exposed

The phenomenon of “ Industrial Melanism” demonstrates

(a)

Natural selection

(b)

induced mutation

(c)

reproductive isolation

(d)

geographical isolation

Peripatus is the connection link between Annelida and _______________

(a)

Arthropoda

(b)

Platyhelminthes

(c)

Mollusca

(d)

Echinodermata

Which of the following is/are not examples of analogous structure
(a) Wings of Birds and Bats
(b) Wings of Birds and Insects
(c) Thorn of Bougainvillea and Tendril of Cucurbita
(d) Flippers of Penguins and Dolphins

(a)

a, b, c

(b)

a and c

(c)

band d

(d)

All the above

The Athlete’s foot disease in human is caused by _______

(a)

Bacteria

(b)

Fungi

(c)

Virus

(d)

Protozoan

Choose the symptom applicable for mumps

(a)

Muscular stiffness

(b)

Enlargement of parotid gland

(c)

Flu like illness

(d)

Respiratory failure

The incubation period of malaria is_______days.

(a)

10

(b)

12

(c)

15

(d)

18

Which one of the following pairs is wrong.

(a)

Amoebiasis - Home fly

(b)

African sleeping sickness - Tsetse flies

(c)

Kala-azar - Sand fly

(d)

Malaria - female Anopheles mosquito

The test that confirms HIV positive is ________________

(a)

Western blot

(b)

Northern blot

(c)

Southern blot

(d)

all the above

Which of the following is not involved in nitrogen fixation?

(a)

Pseudomonas

(b)

Azotobacter

(c)

Anabaena

(d)

Nostac

__________is free living bacteria which acts as a biofertilizer.

(a)

Azospirillum

(b)

Nostoc

(c)

Oscillatoria

(d)

Glomus

Which of the following are likely to be present in deep-sea water?

(a)

Archaebacteria

(b)

Eubacteria

(c)

Blue-green algae

(d)

Saprophytic fungi

Name the person who was the first to use the term antibiotic

(a)

Selman Waksman

(b)

Alexander Flemming

(c)

Earnest Chain

(d)

Howard Florey

Predation and parasitism are which type of interactions?

(a)

(+,+)

(b)

(+, O)

(c)

(--, --)

(d)

(+, --)

Which of the following forests is known as the lungs of the planet earth?

(a)

Tundra forest

(b)

Rain for forest of north east India

(c)

Taiga forest

(d)

Amazon rain forest

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancer?

(a)

Ammonia

(b)

Methane

(c)

Nitrous oxide

(d)

Ozone

Plants having similar genotypes produced by plant breeding are called _____.

(a)

clone

(b)

haploid

(c)

autopolyploid

(d)

genome