CBSE Class 7 Science Advanced Biology Reproduction in Plants Very Short Answer Questions Set 01

Very Short Answer Questions

Question 1. Vegetative propagation in grass includes ______.
Answer:
runner
In simple words: Grass spreads through creeping stems called runners.

Teacher's Note:
1. Grass and wild strawberry spread by runners.
2. A runner roots wherever it touches the ground.

Question 2. Potato is an example for ______ vegetative propagation.
Answer:
stem tuber
In simple words: A potato is a swollen underground stem.

Teacher's Note:
1. The eyes of a potato are buds.
2. Each eye can grow into a new plant.

Question 3. Plant from which root system is taken during grafting is called ______.
Answer:
stock
In simple words: The stock supplies the roots.

Teacher's Note:
1. Stock is the rooted part.
2. Scion is the shoot part.

Question 4. Plant from which stem is taken during grafting is called ______.
Answer:
scion
In simple words: The scion is the shoot joined on top of the stock.

Teacher's Note:
1. Scion comes from the superior variety.
2. Remember: scion on top, stock at the bottom.

Question 5. Female reproductive organ of a flower is called ______.
Answer:
pistil
In simple words: The pistil (stigma, style and ovary) is the female part.

Teacher's Note:
1. Another name is gynoecium.
2. The pistil holds the ovules.

Question 6. Petals constitute ______.
Answer:
corolla
In simple words: All the petals together are the corolla.

Teacher's Note:
1. Sepals together make the calyx.
2. The corolla is brightly coloured.

Question 7. In potato, new plants arise from ______.
Answer:
eyes (nodes)
In simple words: The buds in the eyes of the potato sprout.

Teacher's Note:
1. Eyes are small nodes on the stem tuber.
2. Cut potato pieces with an eye will grow.

Question 8. The transfer of pollen grains from anther to stigma is called ______.
Answer:
pollination
In simple words: Pollen moving from anther to stigma is pollination.

Teacher's Note:
1. It happens before fertilization.
2. It may be self or cross.

Question 9. What is reproduction? What are the different forms of reproduction?
Answer:
Reproduction is the process in which an organism produces young ones like itself, which keeps the generations going.
The two forms are asexual reproduction (one parent, offspring identical to the parent, called clones) and sexual reproduction (two parents, male and female gametes fuse to form a zygote that grows into the young one).
In simple words: Making new life either from one parent or from two.

Teacher's Note:
1. Mention both forms with one line each.
2. A clone is genetically identical to its parent.

Question 10. What is zygote?
Answer:
The zygote is the single cell formed when a male gamete fuses with a female gamete during fertilization. It later develops into the young one.
In simple words: The first cell of a new organism.

Teacher's Note:
1. Gametes fuse, and the result is the zygote.
2. In plants the zygote grows into the embryo.

Question 11. What is vegetative propagation? What are the two different types of it?
Answer:
Vegetative propagation is an asexual method in which a new plant grows from a vegetative part such as a root, stem, leaf or bud, and not from a flower.
The two types are natural and artificial vegetative propagation.
In simple words: New plants from roots, stems or leaves, no seeds needed.

Teacher's Note:
1. Natural: by the plant itself. Artificial: by gardeners.
2. Give one example of each in the exam.

Question 12. What is grafting?
Answer:
Grafting joins two closely related plants. The shoot (scion) of a superior plant is fixed on the rooted plant (stock) and tied. They grow together into one plant having the qualities of both, as in grafted rose and mango.
In simple words: Joining the shoot of one plant to the roots of another.

Teacher's Note:
1. Scion is the shoot and stock is the root part.
2. The plants must be closely related.

Question 13. What is ballistic seed dispersal? Give an example.
Answer:
In ballistic dispersal the ripe fruit bursts open with force and throws the seeds away from the parent plant. An example is gorse.
In simple words: Seeds are shot out like pellets.

Teacher's Note:
1. It is an explosive method.
2. Neither wind nor animals are needed.