Free Reproduction in Organisms 02 Practice Test - 7th grade
Question 1
The winged seeds, such as those produced by Maple are dispersed by the wind.
True
False
SOLUTION
Solution : A
Seeds from plants such as Swan and Cottonwood trees are light and have feathery bristles. They can be easily carried away to long distance by the wind. On the other hand, some plants like Kauri and Maple trees have ‘winged’ seeds. These seeds don’t float away but flutter to the ground and is also an example of wind dispersal. Hence the statement is correct.
Question 2
Spiny seeds with hooks are dispersed by animals.
True
False
SOLUTION
Solution : A
Some plants produce seeds that are covered in hooks or spines. These seeds get attached to animals fur or feathers. They are carried upto a certain distance away from their parent plant. Later, these seeds may either fall off, or are rubbed off by the animal. In this way the seeds are dispersed to a new surrounding where they germinate.
Question 3
Cross-pollination happens between the flowers of __________ .
the same plant
different plants of the same species
different plants of the same or different species
different plants of different species
SOLUTION
Solution : B
The transfer of pollen grains from anther to stigma of different flower of different plant of the same species is called cross pollination. Fertilisation takes place only if pollination takes place between plants of the same species.
Question 4
What is the mode of reproduction in potatoes, ginger and turmeric?
Pollination
Fertilization
Sporulation
Vegetative propagation
SOLUTION
Solution : D
The mode of reproduction in potatoes, ginger and turmeric is vegetative propagation from the nodes. Vegetative propagation is a type of asexual reproduction in which new plants are produced from the vegetative parts like stems, roots and leaves.
Question 5
The formation of a zygote requires:
two male gametes
two female gametes
one male and one female gamete
It does not need gametes
SOLUTION
Solution : C
A male and a female gamete fuse together during fertilisation to form a zygote. This is a characteristic feature of sexual reproduction and necessary for variation.
Question 6
Which of the following is true about asexual reproduction in plants?
I: It does not require seeds
II: It takes place in flowers
III: Spore formation is an example of it
IV: It requires two plants for the process
II
I, II and III
I and IV
I and III
SOLUTION
Solution : D
Asexual reproduction requires only one parent plant. There is no exchanging of genetic information, therefore, offspring are clones of the parent. Asexual reproduction in plants can occur in a variety of forms which includes budding, vegetative propagation, spore formation and fragmentation. Hence I and III are correct.
Question 7
Vegetative propagation is possible through buds present in which of the following part of a plant
Flowers
Fruits
Seeds
SOLUTION
Solution : B
Vegetative propagation is a type of asexual reproduction in plants. A part of plant except flower is involved in vegetative propagation, for example stem, leaves etc. The offsprings are identical to the parent plant. Unlike flowers, the buds in axil are vegetative buds and help in vegetative propagation.
Question 8
The spongy seeds or seeds with the fibrous outer coat are generally dispersed by___.
SOLUTION
Solution : C
Different types of seeds have different ways of dispersal depending upon their characteristics.
The seeds which have spongy or fibrous outer coat are generally dispersed by water. The spongy surface allows them to float on the water. E.g., Coconut.
Question 9
The female gamete is also known as the __.
SOLUTION
Solution : C
The female gamete formed in an ovule is also known as the egg. The two cells, egg and sperm, fuse together during fertilisation. This resulting cell formed after fertilisation is called zygote.
Question 10
The seed contains a/an __ enclosed within a protective coat.
SOLUTION
Solution : B
The seed contains an embryo enclosed within a protective coat. Seeds are developed from ovules after fertlisation. The zygote within the ovule develops into an embryo. When the seeds germinate, these embryos grow out into new plantlets.