Science Worksheet (Set 5)
Topic: Reproduction
Q1. Answer briefly:
a. Name three types of asexual reproduction and also give one example of a plant that reproduces asexually.
Types of asexual reproduction: Budding, Fragmentation, Vegetative Propagation
Example: Potato (Vegetative Propagation)
Example: Potato (Vegetative Propagation)
b. Write examples of plants that can reproduce by:
| Method | Example |
|---|---|
| Leaf propagation | Bryophyllum |
| Stem propagation | Rose |
| Underground stem tuber propagation | Potato |
| Underground stem propagation | Ginger |
c. Name two plants that can reproduce only by vegetative propagation.
Banana, Sugarcane
d. Name a type of layering that involves bending and burying a branch which is still attached to the parent plant.
Mound Layering
e. Explain the purpose of using a rootstock and scion in grafting.
– The rootstock provides strong roots and resistance to diseases.
– The scion determines the fruit or flower characteristics of the new plant.
– The scion determines the fruit or flower characteristics of the new plant.
f. Write two examples of plants that are dispersed by the following mode of dispersal:
| Mode of Dispersal | Examples |
|---|---|
| Wind | Dandelion, Cotton |
| Animals | Mango, Guava |
| By explosion | Pea, Balsam |
g. Mosses and ferns commonly reproduce through:
Fragmentation
h. Which organism commonly reproduces through budding?
Hydra
i. Which organism commonly reproduces through spore formation?
Fungi
Q2. Answer the following questions:
a. Tissue culture requires a well-maintained laboratory, spending of material, money, and time, when plants are growing easily in nature. What is the utility of tissue culture?
– Helps in the mass production of plants in a short time.
– Produces disease-free and genetically identical plants.
– Useful for conserving endangered plant species.
– Produces disease-free and genetically identical plants.
– Useful for conserving endangered plant species.
b. What are the main advantages of using cutting as a method of vegetative propagation? (Three points)
– It is a simple and inexpensive method of propagation.
– New plants retain the characteristics of the parent plant.
– Plants grow faster as compared to seed propagation.
– New plants retain the characteristics of the parent plant.
– Plants grow faster as compared to seed propagation.