Description

Biology (314)
Tutor Marked Assignment

Note: (i) All questions are compulsory. The marks allotted for each question are given at same place.
(ii) Write your name, enrolment number, AI name and subject etc. on the top of the first page of the answer sheet.

1. Answer any one of the following questions in about 40-60 words:
a) Explain the term differential reproduction in two steps. (See Lesson-1)
b) Give any one point of difference between the following:- ( ½ x4=2)
i. Prophase of Mitosis and that of meiosis.
ii. Mitotic Anaphase and Anaphase I of Meiosis. (See Lesson-4)

2. Answer any one of the following questions in about 40-60 words.
a) The three steps of unique formation in humans are Tubular secretion, ultra-filtration and selective absorption. (See Lesson -14)
(i) Write them in the correct sequence of their occurrence. (See Lesson- 14)
(ii) Name the microscopic parts of the kidney where each of these steps occurs. (See Lesson-14) (½ x4=2)
b) Why does a cell remain stable when placed in isotonic solution? What happens to it if placed in a hypotonic solution? (See Lesson-8)

3. Answer any one of the following questions in about 40-60 words.
a) (i) Two men were claiming to be the father of a child named Mohan. (See Lesson-23)
(ii) Suggest to them a conclusive method to identify the real father and name the enzyme required to make copies of a piece of DNA for PCR required in the process. (See Lesson- 23)
b) (i) You ate a meal comprising pulses (dal) and chapatis (roti). In which parts of the digestive system would their digestion begin and be completed? (See Lesson-13)
(ii) Also name the end products. (See Lesson-13) (½ x 4 = 2)

4. Answer any one out of the following questions in about 100 to 150 words.
a) Describe the role of thin and thick muscle fibres in the contraction of a striated muscle as explained by the sliding filament theory. (See Lesson- 5)
b) Mention any five organic biomolecules which they synthesize using the nitrogen. (See Lesson-01 )

5. Answer any one out of the following questions in about 100 to 150 words. (½ x3 =1½ +2 ½ =4)
a) The temperature in Delhi falls to even 5°C in winter and may go up to 45°C during summer but our body temperature remains at 37°C .How do we make it possible? (See Lesson-18)
b) Define the concept of homeostasis using the above example in a sentence or two. (See Lesson-18 ) (½ x6)+1=4

6. Prepare any one of the project out of two given below in about 500 words.
a) Collect ten plants of your choice, uproot them carefully, so that their roots are not damaged, and press them between full scape papers and leave under a pile of books.
Now find out from elders, teachers, gardeners the common and scientific names of the plants and record their description as follows:
1. Common name (Local / Hindi)
2. Scientific name
3. Description:
4. Roots
5. Stem
6. Leaves
7. Inflorescence
8. Flower
9. Fruit
10. Seed
11. Habitat
12. Adaptations
13. Utility/value – medicinal / cosmetic / ornament
14. Season when growing
15. Collection site
16. Month when collected
17. Any other notable characteristic feature.
You may use your book or botany book or internet to describe types of the above mentioned parts (See Lesson-6)

(b) Take photographs (or draw Portrait or write name) of one of your parents or siblings and yourself. Stick them close to each other. Now below each photograph enter the following:
Write down the following
i. What is genetics? Write the meaning of inheritance
ii. Draw a Pedigree Chart to show inheritance of any of the characters studied in you and your siblings.
iii. Comment on whether you got the gene from the father or mother and write a sentence as an evidence for the same. (See Lesson- 22)