Define asexual reproduction. Describe two methods of asexual reproduction in animals.
Asexual reproduction may be defined as the reproduction in which only one parent is involved. The produced offspring is an exact copy of their parent or we can say identical to their parent.
Two methods of asexual reproduction in animals:
In Amoeba, one nuclei is divided into two nuclei then the division of body occur in two halves. Each half of the amoeba gets a nuclei and produces new organism by each half.
2. Budding: This is a type of asexual reproduction in which bulges arises from the parent body. For example: Hydra. The bulges are known as bud.
In Hydra, cells divide rapidly and some buds arise from specific site. These buds arise into a small individual when attached to the parent plant. When these becomes mature, they get detached from the parent body and become an independent individual.
What is metamorphosis? Give examples.
How are test tube babies born?
Complete the cross-word puzzle using the hints given below
Across
1. The process of the fusion of the gametes.
6. The type of fertilization in hen.
7. The term used for bulges observed on the sides of the body of Hydra.
8. Eggs are produced here.
Down
2. Sperms are produced in these male reproductive organs.
3. Another term for the fertilized egg.
4. These animals lay eggs.
5. A type of fission in amoeba.
How are babies produced through IVF technique? What are such babies called?
Differentiate between internal fertilization and external fertilization.
Describe the process of fertilization in human beings.
Give two difference between a zygote and a foetus.
In which female reproductive organ does the embryo get embedded?
How is an embryo developed?
Explain the importance of reproduction in organisms.
Which of the following can be beaten into thin sheets?
(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen
Fill in the blanks
(a) Most liquids that conduct electricity are solutions of , ______________ and ______________.
(b) The passage of an electric current through a solution causes ______________ effects.
(c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the terminal of the battery.
(d) The process of depositing a layer ofany desired metal on another material by means of electricity is called .
Give two examples each of situations in which you push or pull to change the state of motion of objects.
Fill in the blanks:
(a) Friction opposes the _____________ between the surfaces in contact with each other.
(b) Friction depends on the _____________ of surfaces. (c) Friction produces __________.
(d) Sprinkling of powder on the carrom board ________ friction.
(e) Sliding friction is ___________ than the static friction.
List conditions under which combustion can take place.
Indicate whether the following statements are True (T) or False (F).
(a) Unicellular organisms have one-celled body. (T/F)
(b) Muscle cells are branched. (T/F)
(c) The basic living unit of an organism is an organ. (T/F)
(d) Amoeba has irregular shape. (T/F)
Which of the following cannot be charged easily by friction?
(a) A plastic scale
(b) A copper rod
(c) An inflated balloon
(d) A woollen cloth.
Fill in the blanks:
(a) A place where animals are protected in their natural habitat is called .
(b) Species found only in a particular area is known as .
(c) Migratory birds fly to far away places because of changes.
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain.
What are the different ways in which water gets contaminated ?
Word game : Use the clues to work out the words.
Across
3. Protruding voice box in boys
4. Glands without ducts
7. Endocrine gland attached to brain
8. Secretion of endocrine glands
9. Pancreatic hormone
10. Female hormone
Down
1. Male hormone
2. Secretes thyroxine
3. Another term for teenage
5. Hormone reaches here through blood stream
6. Voice box
7. Term for changes at adolescence
Suggest three measures to protect ourselves from lightning.
A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.
What is menstruation? Explain.
A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
Fill in the blanks with appropriate words:
(a) Synthetic fibres are also called ______ or _______ fibres.
(b) Synthetic fibres are synthesised from raw material called ________.
(c) Like synthetic fibres, plastic is also a __________ .
Write notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby.
Make a sketch of the human nerve cell. What function do nerve cells perform?
Indicate whether the following statements are True (T) or False (F).
(a) Unicellular organisms have one-celled body. (T/F)
(b) Muscle cells are branched. (T/F)
(c) The basic living unit of an organism is an organ. (T/F)
(d) Amoeba has irregular shape. (T/F)