LIFE PROCESSES: INTRODUCTION

MOVEMENT & LIFE

–Visible movements are indicative of life

–Visible Movements can be:

üGrowth related

üNon growth related

–Some movements invisible to naked eye:

vVery small scale / molecular level movements

Molecular movements are defining criteria of life

            CYTOPLASMIC STREAMING: MOVEMENTS AT CELLULAR LEVEL

Required for repair & maintenance of organized structure

*Virus: show molecular structure only when in host cell

LIFE PROCESSES: Maintenance Processes in living organisms

–Processes essential for life

–Performed even when body seems to be doing nothing

–Require energy

They include:

qNutrition: to obtain food from outside. Food is source of energy. Common element in food C

qRespiration: For breakdown & burning of food, to obtain energy in a common form ATP. Requires O2. Involves oxidizing reducing reactions.

qTransportation: to carry food &  O2 to all parts of body

qExcretion: removal of by products / waste

Unicellular vs Multicellular:

vIn unicellular organisms Diffusion is sufficient to provide for exchange.

vIn multicellular diffusion not so because:

1.Large size, more needs

2.Not all cells are exposed to outer environment

LIFE PROCESSES (Introduction & Nutrition) PRETEST ANSWERS

So assuming that the reading pre test has been sincerely 😇 attempted, I'm today sharing the answers.
If you have not found time/interest to attempt the pre test before, make sure you do that before going through these answers.

1. Molecular movements are needed for life.

2.Energy for life processes is obtained through a process known as Nutrition.

3.Life on Earth depends on Carbon based molecules. (name of element)

4.The most common energy producing reactions in living organisms are oxidation - reduction reactions.

5.The maintenance processes such as nutrition, respiration & excretion are known as Life processes.

6.Besides plants, Bacteria are also capable of  autotrophic nutrition.

7.Breakdown of complex substances in to simple substances is done with help of bio-catalysts known as Enzymes.

8.Whittaker’s 2 groups that are essentially heterotrophs are Fungi & Animals.

9.Food reserve in plants is Starch, while in animals is Glycogen.

10. Leaves with 2 or more coloured patterns are known as Variegated leaves.

11.Opening and closing of stomata is controlled by Guard Cells cells.

12. N is taken in form of nitrates or nitrites from soil; or as organic N compounds prepared by Bacteria.

13. In Amoeba food is taken with the help of Pseudopodia_ while in Paramecium it is taken at a specific spot with the help of Cillia.

14. Watering of mouth is due to production of saliva which contains the enzyme Amylase.

15.  Contraction of muscles in inner lining of alimentary canal leads to movements known as Peristalsis.

16.  Small Intestine is the site of complete digestion in humans.

Self Assessment:

If you have managed ≥12 of 16, you are a good reader, and can easily proceed to next segment.

If you're between the range of 7-11, I suggest you read the pages from your NCERT once again before proceeding to the next segment.

If you're <7, make sure you work on your concentration skills.

LIFE PROCESSES: Reading & Pretest

PRE TEST NCERT pgs 94-100

1.____________ movements are needed for life.

2.Energy for life processes is obtained through a process known as __________.

3.Life on Earth depends on ____________ based molecules. (name of element)

4.The most common energy producing reactions in living organisms are __________________ reactions.

5.The maintenance processes such as nutrition, respiration & excretion are known as __________ processes.

6.Besides plants, ________ are also capable of  autotrophic nutrition.

7.Breakdown of complex substances in to simple substances is done with help of bio-catalysts known as ______________.

8.Whittaker’s 2 groups that are essentially heterotrophs are _________ & _________.

9.Food reserve in plants is _____________, while in animals is ____________.

10. Leaves with 2 or more coloured patterns are known as ____________ leaves.

11.Opening and closing of stomata is controlled by __________ cells.

12. N is take in form of nitrates or nitrites from_________; or as organic N compounds prepared by _____________.

13. In Amoeba food is taken with the help of _____________ while in Paramecium it is taken at a specific spot with the help of _____________.

14. Watering of mouth is due to production of _____________ which contains the enzyme ______________.

15.  Contraction of muscles in inner lining of alimentary canal leads to movements known as ______________.

16.  ________________ is the site of complete digestion in humans.

CLASS X

Welcome to the new session of 2019-20.

with compulsory Board for class X started in 2017-18, students appearing in 2019-20 Class X board examination have 2 years of experience and material available to them. The fear of unknown may have lessened a bit, but anxiety is completely justified. This would be the first time you would be appearing for an external examination. 

Preparation, thorough preparation is the only guarantee to success & the only strategy that can lessen your fears.

Though Biology would be a small part of your syllabus, approximately 1/3rd of science; but on an average 28-30 marks out of 80 of your science exam are from Bio portion.

Interestingly it is comparatively easier to score compared to Physics & Chemistry. It has been my experience that my students find it easier to comprehend & practice. Or may be I'm a good teacher 😉😇 

It would be my attempt in this year to cover the following lessons from class X Biology portion systematically & sequentially:

Chapter 6 Life Processes 

Chapter 7 Control & Coordination

Chapter 8 How do Organisms Reproduce

Chapter 9  Heredity & Evolution

Chapter 10 Our Environment

The strategy in each of the lessons would be:

• Divide the lesson in to specific 3-4 topics based on NCERT book. (we'll strictly keep NCERT as the base)
• A pre test would be uploaded on each topic on  weekly basis. The pretest would be a small objective type test of 15-20 questions.
• Prior to attempting pretest, you must read the pages on which the pretest is based. (the page numbers would be specified at the beginning of pretest).
• Reading of NCERT books thoroughly, line by line, is absolutely must. The pretest is to ensure that. Hence I insist on reading. 
• By class X, each one of you have sufficiently developed reading skills. the role of teachers should only be to :

Guide your learning

Clear Doubts if any

Provide Practice problems

• Next, I shall be uploading study material on the Topic. It'll have diagrams form NCERT, which you should draw & label.
• The study material would also have some retrieval questions which will help you to check your understanding.
• It is suggested that you can make Flash Cards, the flash cards can be assigned in to 3 groups:
• Gp 1 Material that you've become completely comfortable with.
• Gp 2 Material  you would need to rewise again
• Gp 3material you have doubts about or are totally unfamiliar with
• the gp 1 flash cards need to be revised after 4 days, gp 2 flash cards after 2 days, and gp 3 flash cards the next day.
• you can change the card gp based on your retention during revisions.
• Finally at the end of week an assignment would be given with value points based on CBSE pattern. You can solve the assignments and assess the same based on value points provided a day later.
• Finally to ensure proper benefit, a time schedule is essential. a half hour of undistracted & focused follow up should be sufficient. however some may need more or less time. I'll let you be the judge of that.

So we start with Chapter 6: Life Processes.

The chapter would comprise of the following sub parts:

• Introduction
• Nutrition
• Respiration
• Transport
• Excretion

Get set 👍👍 wish you all the very Best