Question

Sets of reproductive terms are given below. Choose the set that has an incorrect combination.
(a) sperm, testis, sperm duct, penis
(b) menstruation, egg, oviduct, uterus
(c) sperm, oviduct, egg, uterus
(d) ovulation, egg, oviduct, uterus
In humans, the development of fertilised egg takes place in the
(a) ovary
(b) testis
(c) oviduct
(d) uterus
In the list of animals given below, hen is the odd one out.
human being, cow, dog, hen
The reason for this is
(a) it undergoes internal fertilisation.
(b) it is oviparous.
(c) it is viviparous.
(d) it undergoes external fertilisation.
Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following.
(a) The animals are small in size and want to produce more offsprings.
(b) Food is available in plenty in water.
(c) To ensure better chance of fertilisation.
(d) Water promotes production of large number of gametes.
Reproduction by budding takes place in
(a) hydra
(b) amoeba
(c) paramecium
(d) bacteria
Which of the following statements about reproduction in humans is correct?
(a) Fertilisation takes place externally.
(b) Fertilisation takes place in the testes.
(c) During fertilisation egg moves towards the sperm.
(d) Fertilisation takes place in the human female.
In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is
(a) ovum
(b) embryo
(c) foetus
(d) zygote
Aquatic animals in which fertilisation occurs in water are said to be:
(a) viviparous without fertilisation.
(b) oviparous with external fertilisation.
(c) viviparous with internal fertilisation.
(d) oviparous with internal fertilisation.
After fertilisation, the resulting cell which gives rise to a new individual is the
(a) embryo
(b) ovum
(c) foetus
(d) zygote
In human beings, the correct sequence of events during reproduction is
(a) gamete formation, fertilisation, zygote, embryo
(b) embryo, zygote, fertilisation, gamete formation
(c) fertilisation, gamete formation, embryo, zygote
(d) gamete formation, fertilisation, embryo, zygote
Very Short Answer Type Questions
Although 2 cells called gametes fuse, the product formed is a single cell called zygote. Justify.
Stages in the life cycle of silkworm are given below. Write them in sequential order.
pupa, silkworm, egg, silkmoth
What is the importance of reproduction?
In markets, eggs of birds are available but never eggs of dogs. Why?
The eggs of frogs do not have shells for protection, yet they are safe in water. How?
Short Answer Type Questions
Fill up the blanks with the terms given below:
body, asexual, binary, single, nucleus
Amoeba is a ___________ celled organism. It reproduces by ___________ reproduction. The process of reproduction begins by the division of its ___________ into two. This is followed by the division of its ___________ into two. This type of reproduction is called ___________ fission.
The term metamorphosis is not used while describing human development. Why?
Mother gives birth to a baby but the baby has characters of both parents. How is this possible?
How is reproduction in hydra different from that in amoeba?
State whether the following statements are True or False. If false, correct the statement:
(a) External fertilisation can occur both in water and on land.
(b) The eggs of fish are covered by hard shells for protection.
(c) Human egg has a head, middle piece and tail.
(d) In adult human females, a single mature egg is released into an oviduct every month.
Why do only male gametes have a tail?​

Answer 1

Answer:

Here is ur answer

1. b
2. a
3. d
4. c
5. a
6. c
7. d
8. c

Fill in the blanks :

• single
• asexual
• nucleus
• body
• binary

True or false

• True
• True
• False
• True

Hope it helps you

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Answer 2

Choose the correct answers:

(c) Sperm is a male reproductive part.

(d) Development of fertilised egg takes place in the uterus.

(b) Hen is an oviparous whereas rest of all are viviparous.

(c) Since, gametes are laid in water many of them are carry away by moving water.

(a) Because small part of the body of the organism grows as bud.

(d) Fertilisation in human takes place in the female body.

(b) Embryo moves down from oviduct into the uterus.

(b) They lay eggs and releases the sperms outside the body.

(d) After fertilisation the zygote is formed.

(a) In human beings, sexual reproduction takes place by the combination of gamates. Fusion of gamates is called fertilisation. Fusion forms a zygote, which divides repeatedly to form embryo.

Very Short Answer Type Questions:

1. During fertilisation, only the nucleus of the sperm moves into the egg cell and fuses with the egg nucleus to form the zygote. The sperm degenerates.

2. Egg, silk worm, pupa, silk moth.

3. Reproduction is an important characteristic feature of living organisms. It is an essential life process which not only helps in survival but also helps in continuity of that race and group immortality, as by reproduction. Young ones replace the old and dying ones. These young ones feed, grow and reproduce again.

4. We find eggs of birds in the market not of the dogs, this is because dog is a mammal and they don't lay eggs. Instead, mammals give birth to a young one through fertilization. All the fertilization takes place inside the female dog. While on contrary, birds are oviparous and lay eggs.

5. Frog's eggs are without any external covering or shell but a layer of jelly hold the eggs together, thus providing them protection. This jelly or gelatinous covering also protects them from drying up and prevents them from being eaten up by other animals or predators.

Short Answer Type Questions:

1. Single, asexual, nucleus, body, binary.

2. The human development does not undergo metamorphosis because the human does not have different stages with different forms like butterfly ( pupa, cocoon). The growth of human is stable.

3. A baby has characters of both parents as the genes from both parents are transferred to the child. This happens because of DNA. From the 22 pairs of chromosomes half are transferred from mother and half from father. This is the reason behind a child having both characteristics.

4. Hydra reproduces by the process of budding in which a bud is formed as a small out growth on the parent body. This bud breaks off when mature and develops into another individual. The reproduction in amoeba is through binary fission.

5. • False, External fertilisation occurs only inside the water not on the land.

• False, The egg of the fish are covered by gelatinous covering for protection.

• False, Human sperm has a head, middle piece and a tail.

• True.

6. Male gamates have tail to facilitate movement of sperms and help them to reach the egg for fertilisation.

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