default_background
✕

Find the best tutors and institutes for Class 12 Tuition

Find Best Class 12 Tuition

Please select a Category.

Please select a Locality.

No matching category found.

No matching Locality found.

Q2(a):
(a) The shift from grain to meat diets creates more demands for cereals. Why?

Solution :

Step 1: The Bioenergetic Framework (Trophic Dynamics)

The demand for cereals in meat-based diets is governed by the Ten Percent Law proposed by Lindeman (1942) [Per the Laws of Thermodynamics regarding energy transfer in ecosystems]. In any food chain, only approximately $10\%$ of the energy available at a specific trophic level is transferred to the next higher level. The remaining $90\%$ is lost as heat through metabolic processes (respiration, movement, excretion, and maintenance of homeostasis).

Step 2: Analysis of Trophic Efficiency

To quantify the inefficiency of meat production, consider the direct consumption of cereals versus indirect consumption through livestock:

Pathway Trophic Level Energy Efficiency
Direct Consumption Producer to Primary Consumer (Human) Highest (Energy consumed directly)
Meat Production Producer to Primary Consumer (Livestock) to Secondary Consumer (Human) Low ($10\% \times 10\% = 1\%$ of primary energy)

Step 3: Calculating Grain Requirement (The Conversion Ratio)

Livestock animals, particularly cattle, act as biological converters with low feed-conversion efficiency. The Feed Conversion Ratio (FCR) represents the amount of grain (cereals/soy/corn) required to produce $1\text{ kg}$ of animal protein. Depending on the species, it takes significantly more mass in grain to produce a smaller mass in meat:

  • Beef: Requires roughly $7\text{--}10\text{ kg}$ of grain to produce $1\text{ kg}$ of beef.
  • Pork: Requires roughly $4\text{--}5\text{ kg}$ of grain to produce $1\text{ kg}$ of pork.
  • Poultry: Requires roughly $2\text{--}3\text{ kg}$ of grain to produce $1\text{ kg}$ of poultry.

Step 4: Ecological and Resource Logic

When a human shifts from a vegetarian diet (direct consumption of producers) to a meat-heavy diet (consumption of primary consumers), the human population effectively moves up the trophic ladder. This transition necessitates an exponential increase in primary production (cereals) to support the intermediary livestock biomass.

Per the Pyramid of Energy, because energy is discarded at every metabolic step in the animal, sustaining the same human population on meat requires:

$E_{demand} = (\text{Human caloric requirement}) \times (\text{Conversion Loss Factor})$

If we define the loss factor $L$ as the reciprocal of the efficiency ($1/0.1$), the demand for grain increases by an order of magnitude, leading to increased pressure on agricultural land, irrigation water, and fertilizer inputs [Based on the Principles of Sustainability and Trophic Ecology].

Visual Representation of Trophic Loss

Cereals (1000kg) Livestock (100kg) Human (10kg)

Final Solution: The shift to a meat-based diet creates higher demands for cereals because of the inherent energy loss (approx. 90%) between trophic levels. To produce animal protein, large quantities of cereals must be diverted to livestock as feed; due to inefficient conversion ratios (FCR), a human meat-based diet requires significantly more primary grain production than a plant-based diet to sustain the same caloric intake.


More Questions from Class 12 Biology Strategies for Enhancement in Food Production LONG ANSWER QUESTIONS


CBSE Solutions for Class 12 Biology Strategies for Enhancement in Food Production


Chapters in CBSE - Class 12 Biology


Top Tutors who teach Strategies for Enhancement in Food Production

(34)
Top Tutor
locationImg Garia Baishnabghata Patuli Township, Kolkata
experience 11 yrs of Exp students 4 students
greenClock 1273 hrs of classes completed
rsIcon 400 per hour
I have a degree in Mechanical Engineering I have conducted over 12000 online sessions on Math. durin
Online Classes Online Classes

I have taught class 12 students for 5 years.

Skills: Mathematics
Also teaches: Class 8 Tuition, Class 11 Tuition and more

locationImg Sanganer, Jaipur
experience 2 yrs of Exp
Spoken English Trainer with 2 years of experience
homeTutions Student's Home
regularClasses Tutor's home

I have around two years of experience in teaching. By profession, I am a spoken English trainer. Since 2016, I have been in this field. I hold a B.Sc degree from MGS University of Bikaner. I love to help students who want to be fluent in English. I'm well-versed in Hindi, English and Punjabi.

Skills: English , Hindi and more
Also teaches: Class 10 Tuition, Class 11 Tuition and more

(2)
Top Tutor
locationImg Sector 39 39C, Chandigarh
experience 6 yrs of Exp students 1 student
greenClock 9 hrs of classes completed
rsIcon 600 per hour
Knowledge is the greatest virtue !!
Online Classes Online Classes

I am experienced, qualified teacher with over 8 years of experience in teaching Maths,Physics, Mechanical engineering,Indian economy ,Indian polity, Geography and History across different boards including CBSE,ICSE,State Boards and GATE exam for different colleges. Passionate about inculcating new skills in learning the concepts with practical application.I have helped thousands of students overcome their fear of learning with participatory session.Learning is two way process between a student and tutor,let's follow this process and learn new concepts.

Skills: Mathematics , Physics and more
Also teaches: BTech Tuition, Class 10 Tuition and more

(22)
Top Tutor
locationImg Taj Bagh, Nagpur
experience 10 yrs of Exp students 2 students
greenClock 97 hrs of classes completed
rsIcon 600 per hour
Mathematics teacher with 14 years of experience
Online Classes Online Classes
homeTutions Student's Home

I have twelve years of experience in teaching mathematics. I hold a B.Tech in Mechanical Engineering and an M.Tech in Mechanical Engineering Design. One of my most rewarding experiences as a teacher was when I helped a student who was depressed due to poor math grades. The student's parents approached me for help, and after taking classes from me, she cleared her tenth board exam with excellent marks in math. My main passion is to teach the basics of the subject, as I've noticed that many students need more foundational knowledge and help with math. I teach Mathematics for classes eighth to twelfth through UrbanPro, both online and offline, in individual and group settings. However, my primary focus is on teaching twelfth-class students. I take great care in designing my lesson plans, ensuring students have a solid understanding of the fundamentals before moving on to more complex topics. During my classes, I use a whiteboard to visually explain concepts and engage students in an interactive learning experience. My teaching philosophy revolves around providing a strong foundation in mathematics. A solid understanding of the basics is crucial for students to excel in the subject. I am patient and understanding towards students who may struggle with math, and I employ various teaching techniques to cater to different learning styles. I need to create a positive and supportive learning environment where students feel comfortable asking questions and seeking clarification. My expertise in mechanical engineering adds dimension to my teaching, as I can provide real-world applications of mathematical concepts, making the subject more relevant and exciting for students. I am passionate about inspiring a love for mathematics in my students and helping them build confidence in their math skills. My focus on teaching the basics, creating a positive learning environment, and providing real-world applications of mathematical concepts, makes me an effective and successful teacher.

Dibyanshu Dash

He is a talented person who can teach both maths and physics. He always teach the concept from indepth and gives boards writing format. Also as its a one to one tutoring your gonna get max attention as possible and all your doubts are going to be cleared by him at the spot. Hope it helps !!

Skills: Mathematics , Physics and more
Also teaches: Class 9 Tuition, BTech Tuition and more

(26)
Top Tutor
locationImg Lake Town, Kolkata
experience 10 yrs of Exp students 2 students
greenClock 634 hrs of classes completed
rsIcon 650 per hour
Online English and Social studies tutor
Online Classes Online Classes

I am an educator with 9 years of teaching experience, specializing in English and Social Science for students from Class 1 to Class 12. Over the years, I have worked with learners from diverse academic backgrounds and age groups, helping them build a strong understanding of concepts while improving their overall academic performance and confidence. I hold a Bachelor of Arts (B.A.) degree and have also completed a TESOL certification. This professional training has strengthened my ability to teach English effectively, especially to students who are developing their language skills. It has helped me adopt learner-friendly techniques that focus on clarity, communication, and real-life usage of the language. My teaching experience spans primary, middle, and senior secondary levels, which allows me to adapt my teaching style according to the learner’s age and learning pace. In both English and Social Science, I focus on developing conceptual clarity, critical thinking, and answer-writing skills that are essential for school exams and overall academic growth. I follow a structured and well-planned lesson approach for every class. Each topic is taught step by step, starting from the basics and gradually moving to deeper understanding. I ensure that students are comfortable with the subject matter before progressing further, making learning less stressful and more effective. My classes are interactive and student-focused. I encourage students to ask questions, share their thoughts, and participate actively during lessons. I use practical examples, real-life connections, and discussions to make concepts easier to understand and more engaging, especially in subjects like Social Science. I conduct both online and offline classes and make use of PPTs and whiteboard-based teaching to support visual learning. My aim is to create a positive and supportive learning environment where students feel motivated, confident, and well-prepared to perform well academically while developing a genuine interest in English and Social Science.

Skills: English , Political Science and more
Also teaches: Class 11 Tuition, Spoken English and more

Other Subjects in CBSE - Class 12

Worksheet Icon

Download free CBSE - Class 12 Biology Strategies for Enhancement in Food Production LONG ANSWER QUESTIONS worksheets

Download Now

Find Best Class 12 Tuition ?

Find Now »