The Science Class 6 online assessment has been prepared according to the new syllabus Single Nation Curriculum (SNC). The topic of the second chapter of science class 6 is “Reproduction in Plants”. So, All the questions have been prepared according to the textbook.
Topics Covered in the Assessment
- Reproduction in plants
- Sexual reproduction in plants
- Asexual reproduction in plants
- Pollination
- Self-pollination
- Cross-pollination
- Fertilization
- Germination
Students can practice by solving the assessment to get better results in tests and exams.
The purpose of these online assessments is the preparation of students for annual exams named School Bases Assessments.
Students can practice their tests without any paper funds.
Science Class 6 Online Assessment Unit 2 Reproduction in Plants
Watch the Video before going to attempt the assessment.
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A Video Presentation Describing Fertilization
Notes Unit 2 Science class 6
Notes and Assessments Classe 6 are also available to see Get Notes
Reproduction in Plants
Q. 1) Name three self-pollinated plants.
Answer: Peas, cotton, and tomato are examples of plants grown by self-pollination.
Q. 2) Name three cross-pollinated plants.
Answer: Cross-pollination takes place in maize, papaya and rose.
Q. 3) Name the underground stems that undergo natural vegetative propagation.
Answer: Bulb, tuber and runner are the underground stems that undergo natural vegetative propagation.
Q. 4) What are runners?
Answer: Runners spread their stems horizontally above the ground. They have nods where buds are present. New plants grow from these buds.
Q. 5) Name different parts of the carpel (female reproductive structure).
Answer: Stigma, style and ovary are the parts of the carpel that are female reproductive structure.
Q. 6) Differentiate between sexual and asexual reproduction.
Answer:
| Asexual Reproduction | Sexual Reproduction |
|---|---|
| Gametes (sperms and eggs) are not formed. | Gametes are formed, which fuse to produce new plant. |
| Offspring have characteristics of only one parent. | Offspring has characteristics of both the parent plants. |
| A large number of plants can be produced in a short time. | Less number of plants can be produced in a limited time. |
| Offspring are Identical to the parent. | Offspring are not identical to the parents. |
Q. 7) Differentiate between self-pollination and cross-pollination.
Answer:
| Self-Pollination | Cross-Pollination |
|---|---|
| Transfer of pollen grains from the anther of a flower to the stigma of the same flower or to the stigma of another flower on the same plant is called self-pollination. | Transfer of pollen grains from the anther of a flower to the stigma of the flower on another plant of the same species. |
Q. 8) Differentiate between pollen grains and ovules.
Answer:
| Pollen Grains | Ovule |
|---|---|
| Pollen grains are present on anther. | Ovules are present in the ovary. |
| It is a male part of the reproduction system of a plant. | It is a female part of the reproduction system of a plant. |
Q. 9) Differentiate between fertilization and double fertilization.
| Fertilization | Double Fertilization |
| One sperm fuses with the egg and forms a zygote. This is fertilization. | The other sperm fuses with two polar nuclei in the ovule and forms triploid endosperm. This is called double fertilization. |
Q. 10) Differentiate between budding and grafting.
| Budding | Grafting |
|---|---|
| In this technique, a bud is used as a scion. This scion is joined in the bud of the stock. | In this technique, a cut piece from a plant is joined with another plant. They both appear to be grown as a single plant. |
Q. 11) Differentiate between scion and stock.
| Scion | Stock |
|---|---|
| The cut piece of a plant is called a scion. | The plant to which scion is attached is called stock. |
Q. 12) What are the gametes?
Answer: Gametes are sex cells. These are of two types. Female gametes are called eggs and male gametes are called sperm.
Q. 13) Where are gametes produced in a plant body?
Answer: Male gametes (sperms) are produced on anther which is a male part of a flower.
Female gametes (eggs) are produced in the ovary which is the female part of a flower.
Q. 14) How do male and female gametes approach each other for fusion?
Answer: When pollen grains reach the stigma they produce pollen tubes. Through this pollen tube pollen grains send sperm to the ovary where sperm fuse with the egg. This process is also called fertilization.
Q. 15) Why do male and female gametes fuse with each other?
Answer: Male gametes (sperm) and female gametes (egg) fuse to form a zygote. Zygote develops into an embryo which becomes a new plant after some stages.
Q. 16) What do you think is the most effective way of plant reproduction?
Answer: Artificial vegetative propagation is the most effective way of plant reproduction. It is a technique that helps us to cope with the heavy demand for food.
Many plants can be grown with this technique in a short period of time.
Q. 17) Describe the advantages of artificial vegetative propagation in plants.
Answer:
- Artificial vegetative propagation in plants helps to produce better varieties of plants. ii. It helps to grow required food-producing plants again and again.
- It helps to produce seedless fruits like oranges, grapes and guava, etc.
- It helps to produce disease-resistant plants.