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Question
Explain the term: Pollination.
Solution
The process of transfer of pollen grains from anther to stigma is called pollination.
RELATED QUESTIONS
Name the scientist who put forward the most popular model of DNA.
State the importance of DNA copying.
Match items in Column I with those in Column II:
| Column I | Column II | ||
| (a) | Bud | (i) | Maple |
| (b) | Eyes | (ii) | Spirogyra |
| (c) | Fragmentation | (iii) | Yeast |
| (d) | Wings | (iv) | Bread mould |
| (e) | Spores | (v) | Potato |
| (vi) | Rose |
Find the odd one out:
Amoeba, Euglena, Planaria, Paramoecium
What is the name of the reproductive process :
which involves two parents?
Write down the different methods of asexual reproduction.
Fill in the following blank with suitable word :
the process of...........ensures continuity of life on earth.
Match the organisms given in column I with the methods of reproduction/propagation given in column II :
| Column I | Column II | |
| (i) Plasmodium | (a) Spore formation | |
| (ii) Spirogyra | (b) Leaves | |
| (iii) Jasmine | (c) Regeneration | |
| (iv) Apple tree | (d) Budding | |
| (v) Bryophyllum | (e) Binary fission | |
| (vi) Potatoes | (f) Layering | |
| (vii) Rhizopus | (g) Fragmentation | |
| (viii) Hydra | (h) Tubers | |
| (ix) Planaria | (i) Cuttings | |
| (x) Leishmania | (j) Multiple fission | |
| (xi) Sugar cane | (k) Grafting | |
| (xii) Rose |
What is meant by reproduction?
The protozoan having a flagellum at its one end is :
(a) Amoeba
(b) Paramecium
(c) Hydra
(d) Leishmania
In the list of organisms given below, those which reproduce by the asexual method are :
(i) banana
(ii) yak
(iii) yeast
(iv) Amoeba
(a) (ii) and (iv)
(b) (i), (iii) and (iv)
(c) (i) and (iv)
(d) (ii), (iii) and (iv)
The offsprings formed by asexual reproduction method have greater similarity among themselves because :
(i) asexual reproduction involves only one parent
(ii) asexual reproduction involves two parents
(iii) asexual reproduction involves gametes
(iv) asexual reproduction does not involve gametes
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)The offsprings formed by asexual reproduction method have greater similarity among themselves because :
(i) asexual reproduction involves only one parent
(ii) asexual reproduction involves two parents
(iii) asexual reproduction involves gametes
(iv) asexual reproduction does not involve gametes
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)
Name two animals which undergo external fertilisation.
Fill in the following blank with suitable word :
The union of a sperm nucleus with an egg nucleus is known as.......... and results in a .........egg.
State whether the following statement is true (T) or false (F):
Dogs and cats reproduce from two parents.
Write the full form of DNA.
Name the part of the cell where DNA is located?
Match the following:
| Column ‘I’ | Column ‘II’ |
|
(1) Inhibits plant growth
|
(a) Breaks large fat globules into smaller ones
|
|
(2) Cytokinins
|
(b) Auxins
|
|
(3) Cellular respiration
|
(c) Mitochondria
|
|
(4) Bile
|
(d) Promote cell division
|
|
(e) Abscisic acid
|
What do you mean by ‘Connecting Links’? Give one example.
Explain the term Reproduction.
Answer the following question.
The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of the population.
(a) List two common signs of sexual maturation in boys and girls.
(b) What is the result of reckless female foeticide?
(c) Which contraceptive method changes the hormonal balance of the body?
(d) Write two factors that determine the size of a population.
Sporoderm is made up of ______.
In vitro pollen germination and pollen tube elongation can be induced by ______.
Self-incompatibility is found in flowers of plants _______.
Draw a well labelled diagram of the monocot seed you have studied.
Reproductive part of a plant is ______.
The plant which propagates with the help of its leaves is ______.
What will happen if you cut planaria into small fragments?
Identify the chromosome number of the endosperm in the following case. In an angiosperm a female plant having 2n = 24 is crossed with a male plant having 2n = 12.
Explain the term reproduction.
In a flower, the parts that produce male and female gametes (germ cells) are
In the list of animals given below, hen is the odd one out.
| human being | cow | dog | hen |
The reason for this is
Which of the following statements about reproduction in humans is correct?
Which of the following nucleus is unlike other nuclei in the female gametophyte of angiosperms?
Give reason for the following:
All multicellular organisms cannot give rise to new individuals through fragmentation or regeneration.
Choose the correct meaning of reproduction.
