LSE-06 Developmental Biology Solved Assignment 2020

ASSIGNMENT
(Tutor-Marked Assignment)
Course Code: LSE-06
Assignment Code: LSE-06/TMA/2020
Max. Marks: 100

PART I (Plant Development)
1. Make neat and labelled diagrams of the following: (5×4)
i) Stigmatic papilla,
ii) Relative concentration of auxin in different parts of a seedling,
iii) Aleurone cells of a cereal with aleurone grains, and
iv) Diagrammatic representation of secondary growth in a dicot stem of four
years.
2. Write short notes on the following: (5×4)
i) Characteristics of wood,
ii) Clonal propagation,
iii) Syngamy and triple fusion, and
iv) Autochory.
3. With the help of clear and well labelled diagrams prepare detailed accounts on
senescence, and abscission.
(10)
PART II (Animal Development)
1. With the help of a well labelled diagram describe the three phases of
spermatogenesis in vertebrates.
(10)
2. What happens and why :
i) When limb mesoderm is grafted under the ectoderm in any region of an
early embryo of chick?
ii) If cells of different species of sponges are separated and then put together
as a mass?
iii) When Hydra is transversely sliced into annular segments.
iv) If a baby is born to a woman infected with Rubella virus during the first 4-5
weeks of pregnancy?
v) If the neotenic Mexican axolotl, Ambystoma mexicanum is given thyroid
hormone or TSH.
(5×2=10)
3. Differentiate between the following:
i) Intrinsic and extrinsic growth factors
ii) Holoblastic and meroblastic cleavage.
iii) Embryonic development and regeneration.
iv) Blastula and blastocyst.
v) Instructive interaction and permissive interaction in secondary embryonic
induction.
(5×2=10)
4
4. Write short notes (500 words) on any four of the following:
i) Oogenasis in mammals
ii) Embolic morphogenetic movements
iii) Gastrulation and formation of hypoblast in chick
iv) Patterns of cleavage
v) Process of neurulation in frog.
vi) Stages of carcinogenesis.

LSE-06, LSE 06, LSE-6, LSE 6, LSE6, LSE06