During favourable conditions ______ shows multiple fission.

(a)

Plasmodium

(b)

Amoeba

(c)

Planaria

(d)

Euglena

Testosterone is secreted by ____

(a)

spermatocytes

(b)

sperm

(c)

polar bodies

(d)

leydig cells

Assertion (A): IUD's are inserted in the ovary.
Reason (R): IUD's Increases phagocytosis of the sperm.
Codes:
(a) Both A and R are correct
(b) Both A and R are incorrect
(c) A is correct R is incorrect
(d) A is incorrect R is correct

(a)

Both A and R are correct

(b)

Both A and R are incorrect

(c)

A is correct R is incorrect

(d)

A is incorrect R is correct

The ZW - ZZ type of sex determination is seen ________.

(a)

Butterflies

(b)

Drosophila

(c)

Gypsy moth

(d)

Human being

In gypsy moth we find _________ type of sex determination.

(a)

ZW - ZZ

(b)

XX - XY

(c)

XX - XO

(d)

ZO - ZZ

Identify the proper dominance hierarchy.

(a)

I^A=I^O>I^B

(b)

I^A=I^B>O

(c)

I^O=I^B>I^A

(d)

I^B=I^A>O

Chromosomes were first observed by ________.

(a)

Miescher

(b)

Hofmeister

(c)

Avery

(d)

Griffith

Wobble hypothesis ________.

(a)

proves that many tRNAs are. needed to transport specific amino acids

(b)

proves that the bases in tRNA need not match with mRNA

(c)

helps in economic usage of tRNA

(d)

proves that one tRNA can carry many amino acids

Origin of egg laying mammal a occurred in ___________ period.

(a)

Jurassic

(b)

Carboniferous

(c)

Triassic

(d)

Cretaceous

Darwin's finches in Galapagos islands and Australian Marsupials are the example of

(a)

Industrial mechanism

(b)

Reproductive isolation

(c)

Genetic recombination

(d)

Adaptive recombination