CBSE Guess and Guide for 8th Science (Biology)
Reproduction in Animals
NCERT Guess Questions - CBSE Guide - CBSE Hots
Question.1: What are the
different modes of reproduction?
Answer:
Reproduction takes place by two different methods:
(1)
Asexual method in which a single parent is involved in the process of
reproduction e.g. in Hydra, Bacteria, Amoeba etc.
(2)
Sexual method in which both the parents (male and female) are involved in the
process of reproduction e.g. in human being.
Question.2: What is
fertilization? Explain the types of fertilization.
Answer:
When a male and a female gamete come in contact with each other, they fuse. The
male sperm enters the female ova and the nucleus of the sperm fuses with the
nucleus of the ova resulting into a single nucleus. This whole process is
called Fertilization. In short
fertilization is the process of fusion of male and female gametes.
Question.3: How are
viviparous and oviparous animals are different?
Answer:
Viviparous animals are those to give birth to young ones. They do not lay eggs.
Oviparous animals are those animals that lay eggs and do not produce the young
ones directly. The young one takes birth from the eggs.
Question.4: Explain
Budding.
Answer:
Budding is an asexual method of reproduction in animals. It requires only a
single parent to reproduce. The body of the animal starts developing a small
bulging structure called bud which slowly grows and have itself disconnected
from the parent animal and becomes a separate individual. This is called Budding. Animals like hydra reproduce
through budding.
Question.5: What is
cloning?
Answer:
Cloning is a method of producing an identical organism, a body part or only a
cell. The produced organism or cell is completely identical to its original
organism or cell. Cloning of an animal was successfully performed for the first
time by Wilmot and his colleagues. They cloned successfully a sheep named
Dolly, which was the first mammal to be cloned. Later on this method has been
used many times in animals to produce identical clones.
Question.6: Explain how
external fertilization takes place.
Answer:
In the case of external fertilization the female lay eggs in slow moving streams.
The males also release sperms on this cluster of eggs. The sperms move in water
with the help of tail and when come in contact with egg, they get fertilized.
Question.7: Which male
organ produces gamete?
Answer:
Testes.
Question.8: What does an
embryo grow into?
Answer:
Foetus.
Question.9: Give
examples of animals undergoing budding and binary fission for reproduction.
Answer:
Hydra - Budding & Amoeba - Binary fission.
Question.10: Fill in the
blanks:
(a) All living organisms _______ to produce young ones like
them.
(b) Organisms divide by two ways ________ and ________.
(c) Ovum fertilizes with sperm in _____ female reproductive
organ.
(d) Snake can reproduce by laying ______ and producing young
ones.
(e) Chemicals created by endocrine glands are called _____.
(f) The gland of emergency is called _________.
(g) _________ refers to stage of maturation of the reproduction
organs.
(h) _______ is the stage when reproductive organs reach sexual
maturity.
(i) Tadpole is the developing stage of the ______.
(j) Human has ______ mode of reproduction.
(k) The cell formed after the process of fertilization is called
_______.
(l) Frogs undergo ________ to become adults from tadpoles.
Answer:
(a) reproduce. (b) Sexually and asexually. (c) Oviduct. (d) Eggs. (e) Growth
hormone. (f) Uterus. (g) Adolescence. (h) Puberty. (i) Frogs. (j) Sexual. (k) Zygote.
(l) Metamorphosis.
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