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Reproduction in Lower and Higher Animals Class 12 Biology Chapter 2 Exercise Solutions


Class 12
Chapter 2
Reproduction in lower and higher animals
All exercise solution
By: solutions made easy

Q. 1 Multiple choice questions.
1. The number of nuclei present in a zygote is ……a. two b.one c. four d.eight
Ans: one

2. Which of these is the male reproductive organ in human?
a. sperm b. seminal fluid
c. testes d. ovary  ans:testes
3. Attachment of embryo to the wall of the uterus is known as……..a. fertilization b. gestationc. cleavage d. implantationAns:implantation

4. Rupturing of follicles and discharge of
ova is known as ..............
a. capacitation b. gestationc. ovulation d. copulationAns:ovulation



8. Presence of beard in boys is a ............
a. primary sex organ
b. secondary sexual character
c. secondary sex organ
d. primary sexual character
Ans:secondary sexual character

Q. 2 Answer in one sentence.
1. What is the difference between a foetus.
   and an embryo?
Ans:Embryo is a growing egg after fertilization until the main parts.

3. Which glands contribute fluids to the
semen?
Ans:The glands which contribute fluids to the semen are seminal vesicles, prostate gland.
4. Name the endocrine glands involved in
maintaining the sex characteristics of males.
Ans:Interstitial cells of Leydig which lie in between the seminiferous tubules are involved in maintaining the sexual characteristics of male.
5. Where does fertilization and
implantation occur?
Fertilization of ovum takes place in the ampulla region of fallopian tube whereas implantation occur in the endometrium of uterus.
6. Enlist the external genital organs in
female.
The external genital organs in female include the following parts such as vestibule, labia minora, clitoris, labia majora and mons Veneris.
7. Give two differences between blastula
and gastrula.


Q. 3 Fill in the blanks:
1. The primary sex organ in human male
is testis.
2. The uterus is also called the womb.
3. Sperm fertilizes ovum in the ampulla of fallopian tube.
4. The disc like structure which helps in
the transfer of substances to and from
the foetus's body is called placenta
5. Gonorrhoea is caused by Neisseria gonorrhoeae bacteria.
6. The hormone produced by the testis is testosterone / androgen.
Q. 4 Short answer questions.
1. Write a note on budding in Hydra.
[  ] Budding is a type of asexual reproduction method seen in Hydra.
[  ] Budding takes place during favourable period.
[  ] Towards the basal end of the body, small outgrowth is produced which is called a bud.
[  ] It grows and forms tentacles and gradually forms a new individual.
[  ] The young Hydra after complete development detaches from the parent and becomes an independent new organism.
2. Explain the different methods of
reproduction occuring in sponges.
[  ] Sponges reproduce both asexually and sexually and they also possess the power of regeneration. Their sexual reproduction is similar to higher animals even though their body organization is primitive type.
[  ] Asexual reproduction in sponges takes place by regeneration, budding and gemmule formation.
[  ] In sponges, during unfavourable period, gemmule is produced. It is an internal bud.


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