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ICSE Question Bank
2020Q1(h)(iv)The Reproductive System
Short answerHard1 mark
1(h)

The diagram given below represents a plant movement. Answer the following questions: The diagram given below represents a plant movement. Answer the following questions:

Figure for this question

What is part A attracted to?

Topic: Attachment of the pollen tube

Previous-year question practice database

Answer

Exam answer

The OVULE (specifically the EMBRYO SAC within the ovary), which secretes the chemicals that attract the growing pollen tube.

Explanation

The ovule secretes chemical substances that guide the pollen tube, which grows down the style towards the ovary and enters the ovule through a small opening called the MICROPYLE.

The tube then releases the male gametes, and fertilisation follows.

This answers the "why" behind part (i): the movement is chemotropic precisely BECAUSE the ovule is emitting a chemical signal. Without it the tube would have no direction to grow in.

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