LIFE PROCESSES (PART III): NUTRITION IN PLANTS

This video post is for Class X students. continuing the previous lecture on Nutrition in Plants. In this video we'll cover the following:

1.  Experiment to determine carbon dioxide is essential for photosynthesis
2. Stomata: Opening & Closing Mechanism

With this we conclude the material on Nutrition in Plants, in the Life Processes lesson.

You'll be solving the questions given.

LIFE PROCESSES II (NUTRITION)

In the next in the series of video for class X, Lesson 6, here is a short video explaining:

1. What is Nutrition
2. Types of Nutrition
3. Autotrophic Nutrition
4.  Activity to show chlorophyll is essential for photosynthesis

Leave queries & comments.

Good Luck

FUNDAMENTAL UNIT OF LIFE (PART II)

CLASS IX

Continuing with previous lecture on Cell: Fundamental Unit of Life for Class IX

This one covers #CellMembrane to develop a basis for study of transport across cell membrane.

Please follow carefully.

This video is followed by 4 more to develop an understanding of the types of transport across cell membrane.

Next we'll be doing some questions on the topics covered till now.

Understand, enquire & apply.

REPRODUCTION IN ORGANISMS PART II

In continuation with our previous discussion about introduction of first chapter, I'm uploading the second part.
In this part we'll be discussing Asexual reproduction: Modes & Significance.
Go through the video and try solving the assignments in between as well as at the end.

Class IX: Fundamental Unit Of Life (Part 1)

Welcome to Class 9.

Here is a lecture VDO for Chapter 5 of NCERT Class 9 Science Books.

Listen carefully and make notes based on the slides.

Happy Learning

Ask questions, clear doubts. Stay in touch

Reproduction In Organisms VDO Lecture

Covid 19 has put on hold many things. The one thing it need not derail is learning.

So here I'm uploading lecture for the first topic of #ClassXII Biology Lesson 1, Reproduction In Organisms.

Stay Connected & Keep Learning

RNA Interference

RNA interference in Unit IV of class 12 Biology is a concept that students find as difficult to grasp as teachers find it difficult to simplify. 
Though the basic concept is quite simple yet it becomes complex since some of the steps are beyond the grade level, and hence conveniently skipped in NCERT text books. with key steps missing you simply cannot grasp the concept.
So here is an easy to understand ppt, explaining the basic concept as well as required background knowledge.
Students can revisit these concepts.
Ask questions where you get stuck. consult your teachers. you may post queries here as well.
So here is the link for the ppt:
RNAi

and a few images

Meloidegyne incognita

Infected Root

Short Test ECOSYSTEM

Ecosystem

Try solving in 20 minutes

1. State the difference between the first trophic levels of detritus food chain and grazing food chain.
2. 8How does primary succession start in water and lead to the climax community? Explain.
3. Why are the pyramids referred to as 'upright' or 'inverted'? Give two examples of inverted pyramids.
4. Why are energy pyramid always erect?
5. Write the equation that helps in deriving the net primary productivity of an ecosystem. Differentiate between primary & secondary productivity.
6. Explain the simplified model of carbon cycle in nature.

Practice Paper: class XII

Lesson Covered:

Strategies for Improvement in Food Production
Microbes in Human Welfare
Biotechnology: Principles & Applications

Time: 1 ½ hour                                                                                                                       MM 40

Instructions:

Q 1-5 (1 mark), 6-10 (2 marks), 11-15 (3 marks), 16-17(5 marks)

1.       Name the first transgenic cow developed and state the improvement in the quality of the product produced by it.

2.       Name the vector used for transferring nematode specific gene in tobacco plant.

3.       What is SCP? Name the organism used for production of SCP.

4.       A resistant variety of Abelmoschus esculentus show resistance against a virus. Name the virus and plant variety.

5.       “A person is suffering with high blood cholesterol.” Which kind of bioactive molecule you will suggest to reduce his cholesterol level?

6.       A banana herb is virus infected. Name the method that will help in obtaining healthy banana plants from this diseases plant.

7.       Name the insect pest killed by the product of cryIAb gene. Explain how this gene makes the plant resistant to the insect pest.

8.       What is activated sludge? Where is it produced? Why is it named so?

9.       What is inbreeding depression. How can it be overcome?

10.   How are sugarcane varieties with high yield, thick stem, high sugar formed that can be grown in North India?

11.   Explain the term MOET. Which hormone is used for this method. Give the key steps of MOET.

12.   What are palindromes? Where are they used?

13.   What was Cohen & Boyer’s contribution to field of Biotechnology? Show diagrammatically.

14.   What is PCR? Where is it used. Represent the key steps diagrammatically.

15.   Draw a well labelled diagram of a cloning vector showing:

Ori, rop, atleast two restriction sites & 2 antibiotic markers. Give function of each.

16.   (a)Write any one drawback of selection of recombinant due to inactivation of antibiotic. Explain how recombinants and non-recombinants are differentiated on the basis of colour production in the presence of a chromogenic substrate?

     (b)Explain why DNA is not able to pass through cell membrane? Which methods are available to make the plant cell competent to take up DNA from surrounding medium?

17.   Given below is the   sketch of one method used to separate DNA fragments:

                

(a) Give the term caption for above diagram.

(b) At which end would be loaded the samples and why?

(c) Analyse the reason for different positions taken up by the DNA bands.

(d)Elaborate the step he would have followed to visualize DNA bands.

(e) Name the gel used in this technique.