The Class 8 biology chapter 2- Reproduction in Plants, deal with basics of how plants reproduce. Let us look into the topics that the chapter covers. Solve the ICSE Selina Class 8 Biology Chapter 2- Reproduction in Plants Questions and compare with the solutions given below. The Selina solutions prepared by the experts at BYJU’S covers all the chapters from the ICSE Selina textbook.
The process by which living organisms give rise to their offspring is called reproduction. There are mainly 2 types of reproduction Asexual and Sexual reproduction.
Asexual reproduction: Only a single parent is involved.
Budding: The parent produces a bud which detaches to form a new individual organism after a certain size. Eg: Yeast
Fragmentation: The parent divides itself into fragments and these fragments grow to an individual organism themselves.Eg: Spirogyra
Spore Formation: The spores present in some plants grow up to form a new individual organism.Eg: Fungi
Vegetative propagation: The new plant or organism is developed from its vegetative parts,i.e., roots, stem, leaves etc. Eg: Potato
Sexual Reproduction: When 2 parents are involved in the process of reproduction.
The chapter also briefs about how plants reproduce through pollination, parts of flowers, different types of pollination, fertilisation, how various types of dispersals affect the reproduction in plants and more.
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Multiple Choice Questions:
1. Put a tick mark against the correct alternative in the following statements:
(a) Pollen is produced in the:
Answer: 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
Answer: 1. Stamens and carpels
(c) Grafting is a method of:
1. Artificial vegetative propagation
2. Sexual reproduction
3. Artificial pollination
Answer: 1. Artificial vegetative propagation
(d) Which one of the following is a false fruit?
Answer: 2. Apple
Short Answer Questions:
Write two ways in which pollination may occur in plants.
Name the three agents of pollination.
The three agents of pollination are:
Give two features of flowers which favour pollination by insects.
Specialities of insect-pollinated flowers:
(a) These flowers are large with coloured petals to attract insects.
(b) The smell of the flower attracts insects.
Name two characteristics of flowers in which pollination occurs by wind.
Special features of wind-pollinated flowers:
(a) They produce light pollen so that it is easily carried away.
(b) A large amount of pollen is produced.
What is a ‘false fruit’? Give one example:
The base of the flowers (thalamus) in false fruits becomes the main fleshy part of the fruit, while the ovary remains a small central part containing seeds. Example: Apple and Pear.
Name any three agencies for dispersal of seeds.
c. Man and animals, birds, bats, squirrels.
Fill in the blanks by selecting suitable words:
(unisexual, fertilisation, fruit, stamen, anther, bisexual, pollination, seed, ovary)
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:
1. What is vegetative reproduction?
Vegetative reproduction: In this method, the vegetative parts of the plants produce new plants. The vegetative part means 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
- The natural method includes reproduction by the stem, by roots and by leaves.
- The artificial method includes reproduction by cutting, layering, grafting and tissue culture.
Briefly explain why a gardener prefers to grow certain plants vegetatively?
Gardener prefers to grow certain plants by the vegetative method. The advantages of doing so are as follows:
1. In a shorter time, Reproduction by vegetative parts takes place.
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.