Agricultural Science: C4 Plants and Practices

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Questions and Answers

What mechanism do C4 plants like maize and sorghum use to enhance photosynthesis at low CO2 levels?

They accumulate CO2 in the chloroplast (correct)

They perform photosynthesis without sunlight

They accumulate CO2 in mitochondria

They do not require CO2 for photosynthesis

Which statement correctly describes the difference between C3 and C4 plants?

C4 plants can thrive only in high CO2 environments

C3 plants can achieve high photosynthetic rates at low CO2 levels

C4 plants are predominantly found in temperate climates

C3 plants lack a CO2 accumulation mechanism (correct)

What are the recognized cropping systems mentioned?

Mono cropping, mixed cropping, and crop rotation (correct)

Single cropping, terracing, and greenhouse farming

Urban farming, vertical farming, and field farming

Hydroponics, aquaponics, and permaculture

Which practice is considered essential for improving crop production at the local level?

Indigenous knowledge practices Signup and view all the answers

What is the significance of low soil fertility in agricultural yields?

It significantly lowers national average yields Signup and view all the answers

Which factor is NOT typically considered in the selection of crops for domestication?

Low water requirement Signup and view all the answers

What is termed as the practice of planting two or more different crops at the same time on the same farm?

Intercropping Signup and view all the answers

What is called the knowledge developed by local people based on long-term habitation in a specific location?

Indigenous knowledge Signup and view all the answers

What is one disadvantage of mono cropping?

Risk of total crop failure Signup and view all the answers

How does mixed cropping benefit soil resource management?

By optimizing the use of soil nutrients, water, and light Signup and view all the answers

Which statement about intercropping is accurate?

It helps reduce soil erosion by providing better soil cover. Signup and view all the answers

What does relay planting entail?

Planting a second crop after the first has grown for some time. Signup and view all the answers

What is the main advantage of crop rotation?

It improves soil fertility and controls pests. Signup and view all the answers

What does mixed cropping help to combat?

Crop pests and diseases Signup and view all the answers

What can be a negative outcome of crop rotation?

Development of resistant weeds and diseases Signup and view all the answers

What is a common practice in intercropping?

Planting cereal crops alongside legumes Signup and view all the answers

How do C4 plants achieve higher photosynthetic rates compared to C3 plants?

By accumulating CO2 inside the chloroplast Signup and view all the answers

What are some examples of C3 crops?

Barley and wheat Signup and view all the answers

What is one significant advantage of C4 plants over C3 plants regarding water usage?

They use water more efficiently and require less water Signup and view all the answers

What defines a cropping system?

The types, sequences, and practices of crop cultivation Signup and view all the answers

Which of the following best describes mono cropping?

Cultivating a single crop type in a designated area Signup and view all the answers

Which carbon fixation mechanism allows C4 plants to thrive better at low CO2 levels?

CO2 accumulation mechanism Signup and view all the answers

How do C3 and C4 plants differ in their response to climate change?

C4 plants continue to thrive despite increased CO2 levels Signup and view all the answers

Which of the following is NOT a characteristic of C4 plants compared to C3 plants?

Greater susceptibility to cold temperatures Signup and view all the answers

Study Notes

Textbook Information

Title: AGRICULTURE STUDENT TEXTBOOK
Grade Level: 11
Year: 2023
Website: Ethiofetena.com

Textbook Care Instructions

Textbook is the property of the school
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Use a bookmark (piece of paper or cardboard).
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Repair any torn pages with paste or tape.
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Contributors

Writers: Seid Ali (MSc), Shimelis Gizachew (PhD)
Editors: Bimrew Asmare (PhD), Fetene Regassa (PhD), Tamene Kitila (PhD)
Illustrator: Yonas Azene (MSc)
Designer: Ephrem Alamrew (MSc)
Reviewers: Taye Tolemariam (Professor, PhD), Teramage Tesfaye (PhD)
Evaluators: Daniel Taddesse (PhD), Serawit Handiso (PhD)
Educational Website: Ethiofetena.com, Ethiopian No 1 Educational Website
University: Hawassa University
Ministry of Education: Ministry of Education, Federal Democratic Republic of Ethiopia

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Description

This quiz delves into the mechanisms of C4 plants like maize and sorghum, exploring their unique photosynthesis process. It also examines the contrasting features of C3 and C4 plants, recognized cropping systems, and essential practices to enhance local crop production. Test your understanding of agricultural concepts and practices crucial for sustainable farming.