Grade 9 Biology Worksheet: Plants — Challenge Practice

Plants Challenge Practice

Grade 9 Biology Plants Challenge Practice Medium 10 Questions 15 Views

Classroom Worksheet

Grade 9 Biology Worksheet: Plants — Challenge Practice

Plants Challenge Practice

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Score______ / 10

Grade: Grade 9

Subject: Biology

Topic: Plants

Time: 20 Minutes

Difficulty: Medium

Questions: 10

Instructions:
Answer all 10 questions. Show your reasoning where needed. Read each question carefully and use complete sentences for written responses.

Skills Practiced:

Plants
Biology
Critical Thinking
Problem Solving

1Question

What is the main function of roots in a plant?

2Question

Name the two main types of vascular tissue in plants and state what each one transports.

3Question

Why are leaves usually broad and flat?

4Question

Describe the role of chlorophyll in photosynthesis.

5Question

A plant placed near a window leans toward the light. What is this response called, and why does it happen?

6Question

Explain how guard cells help a plant balance water loss and gas exchange.

7Question

Why do plants need both water and carbon dioxide for photosynthesis?

8Question

Compare transpiration and photosynthesis. How are they different, and how are they connected?

9Question

A scientist removes the chlorophyll from a leaf and then places it in light. Predict what will happen to photosynthesis in that leaf and explain why.

10Question

A farmer wants to increase crop growth in a greenhouse. Name two conditions that could be controlled to improve photosynthesis, and explain how each one helps.

Answer Key

#	Answer
1	Roots anchor the plant in the soil and absorb water and minerals.
2	Xylem transports water and minerals; phloem transports sugars produced by photosynthesis.
3	Leaves are broad and flat to increase the surface area for capturing sunlight and exchanging gases.
4	Chlorophyll is the green pigment that absorbs light energy used to drive photosynthesis.
5	This response is called phototropism. It happens because the plant grows toward light to maximize photosynthesis.
6	Guard cells open and close stomata to allow carbon dioxide in for photosynthesis while reducing water loss by closing when conditions are dry.
7	Water provides hydrogen and electrons, and carbon dioxide provides carbon to make glucose during photosynthesis.
8	Transpiration is the loss of water vapor from plant leaves, mainly through stomata. Photosynthesis is the process of making glucose using light, carbon dioxide, and water. They are connected because open stomata allow carbon dioxide in for photosynthesis but also let water escape during transpiration.
9	Photosynthesis will not occur effectively because chlorophyll is needed to absorb light energy. Without chlorophyll, the leaf cannot capture enough light to power photosynthesis.
10	Two conditions are light intensity and carbon dioxide concentration. Increasing light intensity provides more energy for photosynthesis, and increasing carbon dioxide concentration gives more raw material for making glucose. Temperature could also be controlled because photosynthesis works best within an optimal temperature range.