Solution Lakmir Singh Manjit Kour class 5 ICSE Science Chapter 5 Plant Reproduction - Fertilization
EXERCISES
Objective Type Questions
A. Give one word for the following
1. Outer covering of a seed seed coat
2. The part of a seed that contains stored food for the baby plant cotyledons
3. A fruit that bursts with great force scattering the seeds pea
4. A baby plant formed after germination seedling
5. A plant that gives rise to new plants if its leaf falls on moist soil bryophyllum
B. Multiple Choice Questions (MCQs)
1. Seed leaves are also known as
a. cotyledons
b seedling.
c plant
d. seed coat
2. What are the conditions for a seed to grow into a new plant ?
a Right amount of air
b. Right amount of water
c Right amount of warmth
d All of these
3. Underground stems like potato and ginger have ________on them.
a. ears
b. nose
c eyes
d mouth
4. Which of the following plants can grow by the process of stem cutting?
a. Potato
b. Rose
c. Hibiscus
d. All of these
5 _________is a way to distribute seeds over a wide area.
a Pollination
b. Germination
c. Fertilization
d. Dispersal
6. Sycamore seeds have these special parts to help them in dispersal by air.
a. Hairy growth
b. Wing-like structures
c. Eyes
d. Seed
C. Fill in the blanks.
[zygote , photosynthesis explosion gamete Ovary]
1. The reproductive cells are also called gamete
2. The fertilized female reproductive cell is called Zygote
3. The ovary of a flower develops into a fruit.
4. After the cotyledons fall off, the young plant makes food through Photosynthesis
5. Pods of balsam disperses through the method of Explosion
D. Draw lines to match each type of seed to its agent of dispersal
1. Apple. 7. Coconut
2. Guava. Wind. 8. Dandelion
3. Dataram. Water 9. Balsam
4. Lotus. Explosion. 10. Lady finger
5. Burdock. Animals. 11. Orange
6. Pea. 12. Sycamore
Wind: Datura , Burdock, Dandelion , Sycamore
Water: Lotus,, Coconut
Explosion: Pea, Balsam , Lady finger
Animals: Apple, Guava, Orange
Subjective Type Questions
A. Answer the questions in short.
1. What is fertilization?
Answer: The union of male and female reproductive cells or gametes is called fertilization.
2. What is germination?
Answer: The process of seed turning into a Seedling is called germination.
3. What is the function of cotyledons?
Answer: The function of cotyledons is to store food for baby plant.
4. Name the different ways plants disperse seeds, giving examples of each
Answer: Different ways of seed dispersal with two examples:-
● Dispersal by wind- i) Dandelion seeds. ii) Sycamore seed
● Dispersal by animals-i) Orange seed. ii) Mango seed
● Dispersal by water- i) seeds of lotus ii) seeds of lily
● Dispersal by explosion- i) pea seed ii) Lady finger
.
Answer the questions in detail.
1. Describe the process of fertilization.
Answer: The union of male and female reproductive cells or gametes is called fertilization. It results in the formation of fertilized female reproductive cell called zygote which developed in a seed
2. What changes lead to fruit formation after fertilization is over?
Answer: After fertilization, the following changes take place to form a fruit:-
● The sepals, petals and stamens are of no use and they usually become dry and fall off.
● The ovary of a flower swells up and develops into fruit
3. Describe the structure of a seed.
Answer:
A seed is covered by a seed coat. C
Inside the seed coats, seeds have fleshly seed leaves called cotyledons D
There is a young plant inside the seed. Its root is radicle B
and shoot is plumule A
4. Why is seed dispersal important?
Answer: If plants grow too closely together, they have to compete for light , water and nutrients. Seed dispersal allows plants to spread out.
5. What features help seeds in dispersal by wind ?
Answer:
Following features help seeds in dispersal by wind-
1. Seeds are very light.
2. Seeds have hairy growth which act. as parachutes.
3. Seeds have Wing-like structures
