Important Questions for Class 7 Science Chapter 8 Reproduction in Plants

Important Questions for Class 7 Science Chapter 8: Chapter 8 of Class 7 Science, Reproduction in Plants , explores how plants reproduce through different processes. It covers asexual reproduction , including budding, fragmentation, and spore formation, and sexual reproduction , involving the fusion of male and female gametes. The chapter explains pollination (self and cross-pollination) and fertilization in flowers.

Important Questions for Class 7 Science Chapter 8 Overview

Important Questions for Class 7 Science Chapter 8 PDF

Important Questions for Class 7 Science Chapter 8 PDF

Important Questions for Class 7 Science Chapter 8 Reproduction in Plants

Very Short Answer Questions: 1 mark

1. Which of the following is a vegetative part of the flower?
2. a) Pistil b) Anther c) Leaf d) Seed

Ans: c) Leaf

2. Which of the following is the female part of the flower?
3. a) Style b) Anther c) Filament d) Sepal

Ans: a) Style

3. A piece of branch containing a ____________ is essential for propagation by cutting.
4. a) Bud b) Eye c) Flower d) Node

Ans: d) Node

4. Scars present on the tuber of potato are called as__________.
5. a) Stem b) Branch c) Eye d) Sapling

Ans: c) Eye

5. Propagation by leaf buds is seen in ______________.
6. a) Bryophyllum b) Rose c) Onion d) Potato

Ans: a) Bryophyllum

Short Answer Questions: 3 marks

Differentiate between:

6. Cutting and budding

Cutting :

• A method of vegetative propagation .
• A part of the plant, such as a stem or leaf, is cut and planted in soil to grow a new plant.
• Example: Rose and Money Plant.

Budding :

• A type of asexual reproduction .
• A small outgrowth (bud) develops on the parent organism, matures, and detaches to form a new organism.
• Example: Yeast and Hydra.

7. Budding in potato and budding in Bryophyllum

Budding in Potato :

• Occurs through the "eyes" (buds) present on the surface of the potato tuber.
• Each eye can grow into a new plant when planted in soil.
• Example of vegetative propagation using underground stems.

Budding in Bryophyllum :

• New plants grow from buds located on the leaf margins .
• These buds develop into small plantlets that detach and grow into new plants.
• Example of vegetative propagation using leaves.

8. Stamen and Pistil

Stamen :

• It is the male reproductive part of a flower.
• Consists of two parts:
• Anther : Produces pollen grains (male gametes).
• Filament : A stalk that supports the anther.
• Role: Involved in the process of pollination by transferring pollen.

Pistil :

• It is the female reproductive part of a flower.
• Consists of three parts:
• Stigma : Sticky surface to catch pollen.
• Style : Tube that connects stigma to the ovary.
• Ovary : Contains ovules, which develop into seeds after fertilization.
• Role: Involved in receiving pollen and facilitating fertilization.

9. Budding in potato and budding in yeast

Budding in Potato :

• Occurs through the "eyes" (buds) on the surface of the potato tuber.
• Each eye grows into a new plant when planted in soil.
• This is a method of vegetative propagation in plants.
• Example: Potato tubers.

Budding in Yeast :

• Involves the formation of a small bud on the parent yeast cell, which grows and detaches to form a new yeast cell.
• This is a method of asexual reproduction in unicellular organisms.
• Example: Yeast (fungi).

10. Spore formation in fungus and spore formation in fern

Spore Formation in Fungus :

• Spores are produced in structures called sporangia .
• These are microscopic, lightweight, and dispersed by air, water, or animals.
• Spores help fungi reproduce and spread in favorable conditions.
• Example: Rhizopus (bread mold).

Spore Formation in Fern :

• Spores are produced in structures called sporangia located on the underside of leaves (in clusters called sori).
• Spores grow into a small, heart-shaped structure called a prothallus , which develops into a new fern plant.
• Example: Fern plants.

Long Answer Questions: 5 marks

11. Draw and label the parts of a bisexual complete flower.

Ans:

12. Why is pollination important for sexual reproduction in plants?

Ans: Sexual reproduction in plants happens when the male and female gametes combine. The male gametes are found in pollen grains, which are located in the anther of a flower, while the female gametes are inside the pistil. For fertilization to take place, the male gamete must reach the female gamete.

This happens through pollination , where pollen grains are transferred to the stigma of the pistil. Once the pollen grain reaches the stigma, the male gamete fuses with the female gamete in the ovary, forming a zygote. Pollination is essential for sexual reproduction in plants and can be of two types: self-pollination and cross-pollination .

13. What are the different methods of seed dispersal and how are the seeds adapted for the same?

Ans: Seeds dispersed to different areas for better colonization and survival. Seeds can be dispersed by different methods using different means depending on the seed’s adaptation.

1. Dispersal by wind: Seeds that are dispersed by wings.

Adaption: lightweight, dry, feathered, or winged.

Example: Winged seeds of drumstick and maple, seeds of grasses and sunflowers, etc.

2. Dispersal by water: Seeds that are dispersed by water.

Adaption: light and buoyant as well as water-resistant.

Example: This can be seen in coconut which is a buoyant floating seed with an outer fibrous water-resistant coating.

3. Dispersal by animals: Such seeds are adapted to attach to the body of the animal as they graze or pass along the plants.

Adaptation: Seeds usually have spiny or hook-like structures that attach to the bodies of the animals and are then carried away to distant places.

Example: Mango, Guavas, etc.

4. Dispersal by fruit bursts: When fruits burst the seeds within are released far from the parent plant.

Example: This is seen in castor

Q4. Explain the importance of seed dispersal.

Ans. The process of dispersing a plant seed away from its parent plant is known as seed dispersal. There are numerous reasons why seed distribution is crucial, including:

Benefits of Using Important Questions for Class 7 Science Chapter 8

Focused Revision : Highlights key topics like pollination, fertilization, and seed dispersal for effective preparation.

Concept Clarity : Reinforces understanding of asexual and sexual reproduction processes in plants.

Exam Readiness : Helps in practicing commonly asked questions to boost confidence.

Time-Saving : Reduces the need to go through the entire chapter repeatedly.

Application-Based Learning : Encourages thinking through practical examples and applications in nature.