Selina Textbook Solutions: Reproduction in Plants | Biology Class 8 ICSE PDF Download

 Page 1


Reproduction in Plants 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements 
(a) Pollen is produced in the: 
1. Filament 
2. Style 
3. Pistil 
4. Anther 
(b) Reproductive whorls of a flower are: 
1. Stamens and carpels 
2. Sepals and petals 
3. Sepals and stamens 
4. Petals and carpels 
(c) Grafting is a method of: 
1. Artificial vegetative propagation 
2. Sexual reproduction 
3. Artificial pollination 
4. Cross-pollination 
(d) Which one of the following is a false fruit ? 
1. Tomato 
2. Apple 
3. Potato 
4. Pea 
Short Answer Questions: 
Question 1. 
Write two ways in which pollination may occur in plants. 
Answer: 
The two ways in which pollination may occur in plants are: 
Page 2


Reproduction in Plants 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements 
(a) Pollen is produced in the: 
1. Filament 
2. Style 
3. Pistil 
4. Anther 
(b) Reproductive whorls of a flower are: 
1. Stamens and carpels 
2. Sepals and petals 
3. Sepals and stamens 
4. Petals and carpels 
(c) Grafting is a method of: 
1. Artificial vegetative propagation 
2. Sexual reproduction 
3. Artificial pollination 
4. Cross-pollination 
(d) Which one of the following is a false fruit ? 
1. Tomato 
2. Apple 
3. Potato 
4. Pea 
Short Answer Questions: 
Question 1. 
Write two ways in which pollination may occur in plants. 
Answer: 
The two ways in which pollination may occur in plants are: 
(a) Self-pollination. 
(b) Cross-pollination. 
Question 2. 
Name the three agents of pollination. 
Answer: 
The three agents of pollination are: 
(a) Insect 
(b) Wind 
(c) Water 
Question 3. 
Give two features of flowers which favour pollination by insects. 
Answer: 
Specialities of insect-pollinated flowers: 
(a) These flowers are large with coloured petals to attract insects. 
(b) These are scented so that insects locate the flowers by smell. 
Question 4. 
Name two characteristics of flowers in which pollination occur by wind. 
Answer: 
Special features of wind-pollinated flowers: 
(a) They produce light pollen so that it is easily carried away. 
(b) They produce a large quantity of pollen. 
Question 5. 
What is a “false fruit” ? Give one example: 
Answer: 
In false fruits the base of the flowers (thalamus) becomes the main fleshy part of the 
fruit, while the ovary remains a small central part containing seeds. Example: Apple and 
Pear. 
Question 6. 
Name any three agencies for dispersal of seeds. 
Answer: 
a. Wind 
b. Water 
c. Man and animals, birds, bats, squirrels. 
Question 7. 
Fill in the blanks by selecting suitable words: 
(unisexual, fertilisation, fruit, stamen, anther, bisexual, pollination, seed, ovary) 
Answer: 
a. A flower that bears both the male and the female parts is known as bisexual flower. 
Page 3


Reproduction in Plants 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements 
(a) Pollen is produced in the: 
1. Filament 
2. Style 
3. Pistil 
4. Anther 
(b) Reproductive whorls of a flower are: 
1. Stamens and carpels 
2. Sepals and petals 
3. Sepals and stamens 
4. Petals and carpels 
(c) Grafting is a method of: 
1. Artificial vegetative propagation 
2. Sexual reproduction 
3. Artificial pollination 
4. Cross-pollination 
(d) Which one of the following is a false fruit ? 
1. Tomato 
2. Apple 
3. Potato 
4. Pea 
Short Answer Questions: 
Question 1. 
Write two ways in which pollination may occur in plants. 
Answer: 
The two ways in which pollination may occur in plants are: 
(a) Self-pollination. 
(b) Cross-pollination. 
Question 2. 
Name the three agents of pollination. 
Answer: 
The three agents of pollination are: 
(a) Insect 
(b) Wind 
(c) Water 
Question 3. 
Give two features of flowers which favour pollination by insects. 
Answer: 
Specialities of insect-pollinated flowers: 
(a) These flowers are large with coloured petals to attract insects. 
(b) These are scented so that insects locate the flowers by smell. 
Question 4. 
Name two characteristics of flowers in which pollination occur by wind. 
Answer: 
Special features of wind-pollinated flowers: 
(a) They produce light pollen so that it is easily carried away. 
(b) They produce a large quantity of pollen. 
Question 5. 
What is a “false fruit” ? Give one example: 
Answer: 
In false fruits the base of the flowers (thalamus) becomes the main fleshy part of the 
fruit, while the ovary remains a small central part containing seeds. Example: Apple and 
Pear. 
Question 6. 
Name any three agencies for dispersal of seeds. 
Answer: 
a. Wind 
b. Water 
c. Man and animals, birds, bats, squirrels. 
Question 7. 
Fill in the blanks by selecting suitable words: 
(unisexual, fertilisation, fruit, stamen, anther, bisexual, pollination, seed, ovary) 
Answer: 
a. A flower that bears both the male and the female parts is known as bisexual flower. 
b. A flower bearing only male or female parts is known as unisexual flower. 
c. Transfer of pollen grains from the anther to the stigma is known as pollination. 
d. Fusion of male cell with the female cell is called fertilisation. 
e. The ovule develops into a seed. 
f. The ovary of the flower develops into a fruit. 
Long Answer Questions: 
Question 1. 
What is vegetative reproduction? 
Answer: 
Vegetative reproduction: In this method, new plants are produced by the vegetative 
parts of the plants. The vegetative part mean the leaf, stem and root. Potato, mint, 
ginger, banana etc. are reproduced by this method. 
Vegetative propagation can occur by natural methods as well as by artificial methods. 
Natural method includes reproduction by stem, by roots and by leaves. 
Artificial method include reproduction by cutting, layering, grafting and tissue culture. 
Question 2. 
Briefly explain why a gardener prefers to grow certain plants vegetatively? 
Answer: 
Gardener prefer to grow certain plants by vegetative method. The advantages in doing 
so are as follows: 
1. Reproduction by vegetative parts takes place in a shorter time. 
2. New plants, thus produced, spread very fast in a small area. 
3. It is a surer method. 
4. All the characters of the mother plant are retained by the daughter plants. 
Question 3. 
Why is it disadvantageous to grow plants vegetatively? 
Answer: 
It is disadvantageous to grow plants vegetatively because of following: 
1. As all plants developed by vegetative propagation are identical, they are likely to 
be affected simultaneously if a disease spreads in the farm. 
2. Dispersal of plants does not take place on its own. Daughter plants, so developed, 
tend to remain nearby and are restricted to a particular area leading to competition 
for resources. 
Question 4. 
What is meant by pollination? Explain the structure of germinating pollen grain with the 
help of a labelled diagram. 
Answer: 
Page 4


Reproduction in Plants 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements 
(a) Pollen is produced in the: 
1. Filament 
2. Style 
3. Pistil 
4. Anther 
(b) Reproductive whorls of a flower are: 
1. Stamens and carpels 
2. Sepals and petals 
3. Sepals and stamens 
4. Petals and carpels 
(c) Grafting is a method of: 
1. Artificial vegetative propagation 
2. Sexual reproduction 
3. Artificial pollination 
4. Cross-pollination 
(d) Which one of the following is a false fruit ? 
1. Tomato 
2. Apple 
3. Potato 
4. Pea 
Short Answer Questions: 
Question 1. 
Write two ways in which pollination may occur in plants. 
Answer: 
The two ways in which pollination may occur in plants are: 
(a) Self-pollination. 
(b) Cross-pollination. 
Question 2. 
Name the three agents of pollination. 
Answer: 
The three agents of pollination are: 
(a) Insect 
(b) Wind 
(c) Water 
Question 3. 
Give two features of flowers which favour pollination by insects. 
Answer: 
Specialities of insect-pollinated flowers: 
(a) These flowers are large with coloured petals to attract insects. 
(b) These are scented so that insects locate the flowers by smell. 
Question 4. 
Name two characteristics of flowers in which pollination occur by wind. 
Answer: 
Special features of wind-pollinated flowers: 
(a) They produce light pollen so that it is easily carried away. 
(b) They produce a large quantity of pollen. 
Question 5. 
What is a “false fruit” ? Give one example: 
Answer: 
In false fruits the base of the flowers (thalamus) becomes the main fleshy part of the 
fruit, while the ovary remains a small central part containing seeds. Example: Apple and 
Pear. 
Question 6. 
Name any three agencies for dispersal of seeds. 
Answer: 
a. Wind 
b. Water 
c. Man and animals, birds, bats, squirrels. 
Question 7. 
Fill in the blanks by selecting suitable words: 
(unisexual, fertilisation, fruit, stamen, anther, bisexual, pollination, seed, ovary) 
Answer: 
a. A flower that bears both the male and the female parts is known as bisexual flower. 
b. A flower bearing only male or female parts is known as unisexual flower. 
c. Transfer of pollen grains from the anther to the stigma is known as pollination. 
d. Fusion of male cell with the female cell is called fertilisation. 
e. The ovule develops into a seed. 
f. The ovary of the flower develops into a fruit. 
Long Answer Questions: 
Question 1. 
What is vegetative reproduction? 
Answer: 
Vegetative reproduction: In this method, new plants are produced by the vegetative 
parts of the plants. The vegetative part mean the leaf, stem and root. Potato, mint, 
ginger, banana etc. are reproduced by this method. 
Vegetative propagation can occur by natural methods as well as by artificial methods. 
Natural method includes reproduction by stem, by roots and by leaves. 
Artificial method include reproduction by cutting, layering, grafting and tissue culture. 
Question 2. 
Briefly explain why a gardener prefers to grow certain plants vegetatively? 
Answer: 
Gardener prefer to grow certain plants by vegetative method. The advantages in doing 
so are as follows: 
1. Reproduction by vegetative parts takes place in a shorter time. 
2. New plants, thus produced, spread very fast in a small area. 
3. It is a surer method. 
4. All the characters of the mother plant are retained by the daughter plants. 
Question 3. 
Why is it disadvantageous to grow plants vegetatively? 
Answer: 
It is disadvantageous to grow plants vegetatively because of following: 
1. As all plants developed by vegetative propagation are identical, they are likely to 
be affected simultaneously if a disease spreads in the farm. 
2. Dispersal of plants does not take place on its own. Daughter plants, so developed, 
tend to remain nearby and are restricted to a particular area leading to competition 
for resources. 
Question 4. 
What is meant by pollination? Explain the structure of germinating pollen grain with the 
help of a labelled diagram. 
Answer: 
Pollination: Pollination is the process in which the pollen grains from the anthers are 
transferred to the stigma. 
Structure of the pollen grain: After pollination pollen grains are deposited on the 
stigma of the carpel. Under suitable conditions pollen grains produce a tube known as 
pollen tube. This tube grows down through the stigma and style towards the ovary. 
 
The nucleus of the pollen grains divides by mitosis and forms two male gametes. The 
tip of the pollen tube after entering ovary discharges the two male gametes into the 
embryo sac. 
One of the male gametes fuses with the egg to form the zygote. This fusion is called 
fertilization. Another male gamete fuses with the diploid secondary nucleus and forms 
the endosperm, a food storing tissue. 
Question 5. 
Imagine all the seeds produced by a plant happen to fall under the same plant and 
sprout into new plants. Mention any two problems that will be faced by the new plants. – 
Answer: 
Page 5


Reproduction in Plants 
REVIEW QUESTIONS 
Multiple Choice Questions: 
1. Put a tick mark (?) against the correct alternative in the following statements 
(a) Pollen is produced in the: 
1. Filament 
2. Style 
3. Pistil 
4. Anther 
(b) Reproductive whorls of a flower are: 
1. Stamens and carpels 
2. Sepals and petals 
3. Sepals and stamens 
4. Petals and carpels 
(c) Grafting is a method of: 
1. Artificial vegetative propagation 
2. Sexual reproduction 
3. Artificial pollination 
4. Cross-pollination 
(d) Which one of the following is a false fruit ? 
1. Tomato 
2. Apple 
3. Potato 
4. Pea 
Short Answer Questions: 
Question 1. 
Write two ways in which pollination may occur in plants. 
Answer: 
The two ways in which pollination may occur in plants are: 
(a) Self-pollination. 
(b) Cross-pollination. 
Question 2. 
Name the three agents of pollination. 
Answer: 
The three agents of pollination are: 
(a) Insect 
(b) Wind 
(c) Water 
Question 3. 
Give two features of flowers which favour pollination by insects. 
Answer: 
Specialities of insect-pollinated flowers: 
(a) These flowers are large with coloured petals to attract insects. 
(b) These are scented so that insects locate the flowers by smell. 
Question 4. 
Name two characteristics of flowers in which pollination occur by wind. 
Answer: 
Special features of wind-pollinated flowers: 
(a) They produce light pollen so that it is easily carried away. 
(b) They produce a large quantity of pollen. 
Question 5. 
What is a “false fruit” ? Give one example: 
Answer: 
In false fruits the base of the flowers (thalamus) becomes the main fleshy part of the 
fruit, while the ovary remains a small central part containing seeds. Example: Apple and 
Pear. 
Question 6. 
Name any three agencies for dispersal of seeds. 
Answer: 
a. Wind 
b. Water 
c. Man and animals, birds, bats, squirrels. 
Question 7. 
Fill in the blanks by selecting suitable words: 
(unisexual, fertilisation, fruit, stamen, anther, bisexual, pollination, seed, ovary) 
Answer: 
a. A flower that bears both the male and the female parts is known as bisexual flower. 
b. A flower bearing only male or female parts is known as unisexual flower. 
c. Transfer of pollen grains from the anther to the stigma is known as pollination. 
d. Fusion of male cell with the female cell is called fertilisation. 
e. The ovule develops into a seed. 
f. The ovary of the flower develops into a fruit. 
Long Answer Questions: 
Question 1. 
What is vegetative reproduction? 
Answer: 
Vegetative reproduction: In this method, new plants are produced by the vegetative 
parts of the plants. The vegetative part mean the leaf, stem and root. Potato, mint, 
ginger, banana etc. are reproduced by this method. 
Vegetative propagation can occur by natural methods as well as by artificial methods. 
Natural method includes reproduction by stem, by roots and by leaves. 
Artificial method include reproduction by cutting, layering, grafting and tissue culture. 
Question 2. 
Briefly explain why a gardener prefers to grow certain plants vegetatively? 
Answer: 
Gardener prefer to grow certain plants by vegetative method. The advantages in doing 
so are as follows: 
1. Reproduction by vegetative parts takes place in a shorter time. 
2. New plants, thus produced, spread very fast in a small area. 
3. It is a surer method. 
4. All the characters of the mother plant are retained by the daughter plants. 
Question 3. 
Why is it disadvantageous to grow plants vegetatively? 
Answer: 
It is disadvantageous to grow plants vegetatively because of following: 
1. As all plants developed by vegetative propagation are identical, they are likely to 
be affected simultaneously if a disease spreads in the farm. 
2. Dispersal of plants does not take place on its own. Daughter plants, so developed, 
tend to remain nearby and are restricted to a particular area leading to competition 
for resources. 
Question 4. 
What is meant by pollination? Explain the structure of germinating pollen grain with the 
help of a labelled diagram. 
Answer: 
Pollination: Pollination is the process in which the pollen grains from the anthers are 
transferred to the stigma. 
Structure of the pollen grain: After pollination pollen grains are deposited on the 
stigma of the carpel. Under suitable conditions pollen grains produce a tube known as 
pollen tube. This tube grows down through the stigma and style towards the ovary. 
 
The nucleus of the pollen grains divides by mitosis and forms two male gametes. The 
tip of the pollen tube after entering ovary discharges the two male gametes into the 
embryo sac. 
One of the male gametes fuses with the egg to form the zygote. This fusion is called 
fertilization. Another male gamete fuses with the diploid secondary nucleus and forms 
the endosperm, a food storing tissue. 
Question 5. 
Imagine all the seeds produced by a plant happen to fall under the same plant and 
sprout into new plants. Mention any two problems that will be faced by the new plants. – 
Answer: 
If all the seeds produced by a plant happen to fall under the same plant and sprout into 
new plants then in this situation plants will face the following problems: 
1. A large number of plants will grow in a small limited space. The water and the 
minerals available to them in the soil will be limited. 
2. The air surrounding them will not be enough and less sunshine will be available to 
them. As a result, most of these sprouted plants will die. 
Question 6. 
What is a flower ? Draw a neat labelled diagram showing the L.S. of a typical flower. 
Answer: 
A flower is a reproductive part of a plant. It helps in sexual reproduction as it has male 
parts and female parts. A fully opened flower has the following parts: 
 
Stalk—A flower is attached to the shoot by means of stalk or pedicel stalk. The tip of 
the stalk is swollen or flattened. This is called torus or thalamus or receptacle. 
The different parts of a flower are inserted on the thalamus. There are usually four 
whorls as