Reproduction in Plants

Pollination and Fertilisation

This science revision note aims to guide your child

– understand how flowers are pollinated and fertilised.

– proper scientific keywords to explain the concepts clearly.

 

But before you read on, you might want to download this entire revision notes in PDF format to print it out for your child, or to read it later.

This will be delivered to your email inbox.

Must-know science knowledge on plant parts

In P5, you need to remember the different plant parts and their functions.

I’ve provided the must-know scientific knowledge for insect/animal pollinated flowers.

 

How the scientific knowledge on plant parts is applied to the exam question?

 

The diagram below shows the cross-section of part of a female flower.

 

If the flower is cut at P, can the plant bear fruit? Explain your answer.

 

STEP 1

 

Identify the part(s) of the flower that was/were removed after cutting.

The stigma of the flower was removed.

 

STEP 2

What happens when the flower does not have the part(s) identified in Step 1?

Without the stigma, pollen grains cannot land on the stigma of the flower.

 

STEP 3

So how does your answer in Step 2 link to the plant bearing fruit? First, you need to consider the chain of events that are supposed to take place after pollen grains land on the stigma:

  1. Pollen grains land on the stigma.
  2. Pollen grains grow pollen tubes containing male reproductive cell. It travels down the style to reach the ovary
  3. Male reproductive cell enters the ovule.
  4. Male reproductive cell fuses with female reproductive cell. Fertilisation has taken place.
  5. The ovary will then develop into a fruit

Since you have determined pollen grains cannot land on the stigma, these four events thus cannot take place:

  1. Pollen grains cannot land on the stigma.
  2. Pollen grains cannot grow pollen tubes containing male reproductive cell. It cannot travel down the style to reach the ovary
  3. Male reproductive cell cannot enter the ovule.
  4. Male reproductive cell cannot fuse with female reproductive cell. No fertilisation takes place.
  5. The ovary cannot develop into a fruit.

 

FINALLY, put your answer together

Question: If the flower is cut at P, can the plant bear fruit? Explain your answer.

Answer:

The plant cannot bear fruit.

Evidence: The stigma of the flower was removed.

Pollen grains cannot land on the stigma. Pollen grains cannot grow pollen tubes containing male reproductive cell. It cannot travel down the style to reach the ovary. Male reproductive cell cannot enter the ovule. The male reproductive cell cannot fuse with female reproductive cell. The ovary cannot develop into a fruit.

Note: You should notice many plant parts are mentioned here.

 

Common mistakes

 

Wrong explanation: Pollen grains cannot fuse with ovules.

Pollen grains and ovules are not the reproductive cells of a plant. Pollen grains and ovules only contain the reproductive cells of a plant.

You can download this revision notes so your child can revise them anytime.

This will be delivered to your email inbox.

This revision note explains the concept of seed dispersal.

Click here to read the revision note >>> https://scienceshifu.com/reproduction-in-plants-seed-dispersal-diagram/

Join the ScienceShifu Channel to get the latest learning tips.

 

Benefits of joining ScienceShifu on Telegram:

– Be the first to receive science revision notes from us

– Receive special promotions on all our online courses. 

 

Click on the button below to join the ScienceShifu channel:

Follow the ScienceShifu Instagram Channel to learn more science concepts

 

Benefits of joining Instagram:

– Watch out for interesting posts from ScienceShifu explaining science concepts

– Short videos where I will be going through past year exam questions

 

Click on the button below to follow the ScienceShifu Instagram Channel:

Talk again soon!

Andy Ling – Founder of ScienceShifu.com

Guiding your child to be the master of science concepts

Leave a Reply

Your email address will not be published.

*

For security, use of Google's reCAPTCHA service is required which is subject to the Google Privacy Policy and Terms of Use.

I agree to these terms.