Animals giving birth to young ones:

(a)

Oviparous

(b)

Oviviviparous

(c)

Viviparous

(d)

Both a and b

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

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

The total number of nitrogenous bases in human genome is estimated to be about _____.

(a)

3.5 million

(b)

35000

(c)

35 million

(d)

3.1 billion

Who published the book “Origin of species by Natural Selection” in 1859?

(a)

Charles Darwin

(b)

Lamarck

(c)

Weismann

(d)

Hugo de Vries

Pollen tube was discovered by ______.

(a)

J.G.Kolreuter

(b)

G.B.Amici

(c)

E.Strasburger

(d)

E.Hanning

The ploidy of males produced by arrhenotoky parthenogenesis is ________

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haploid

__________ is Known as anti-sterility vitamin.

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Vitamin-E

Amensalism is called as__________.

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Antibiosis

Endogenous budding

(1)

Wiener

Uterus

(2)

Phagocytosis

IUD

(3)

Noctiluca

R¹

(4)

900 cc

Homo erectus

(5)

secretory phase

What is parthenogenesis? Give two examples from animals.

Mention the differences between spermiogenesis and spermatogenesis

Which method do you suggest the couple to have a baby, if the male partner fails to inseminate the female or due to very low sperm count in the ejaculate?

What are holandric genes?

List out the major gases seems to be found in the primitive earth.

What are clones?

Name the chemicals used in gene transfer.

Pyramid of energy is always upright. Give reasons

Define gametogenesis.

Differentiate Intersexes from Supersexes

Rearrange the descent in human evolution
Austrolopithecus → Homo erectus → Homo sapiens → Ramapithecus → Homo habilis.

List out the functions of tapetum.

What are multiple alleles?

What is seed ball?

Identify the given image and label its parts marked as a, b, c and d

Differentiate continuous variation with discontinuous variation.