Ecosystems and Energy Flow — BIOLOGY STD 12 Science — Question

Observe the diagrams (a), (b) and (c)
1.Which step of protein synthesis is shown in the following diagrams?
2.During initiation, which subunit of ribosome binds with m-RNA?
3.What are the three binding sites for t-RNA on ribosomes?
4.On which site of ribosome second and subsequent t-RNA arrives?
5.Which link is binding amino acids in diagram (b)?
6.Which chain is being released from ribosome in diagram (c) ?

Enlist the names of following cranial nerves : III, W VI, XI

Genetic Disorders
[Turner’s syndrome, Sickle-cell anaemia, Thalassemia, Edward’s syndrome, Klinefelter’s syndrome, Down’s syndrome]

Column A	Column B
(A) Autosomal disorder	—————–
(B) Sex chromosomal disorder	—————–
(C) Mendelian disorder	—————–

Classify the given plant hormones as their specific effect observed in plants in Column A and complete Column B.
(ABA, GA, Ethylene, Kinetin)

Column A	Column B
(1) Bolting of rosette plants	————
(2) Epinasty	————
(3) Closure of stomata	————
(4) Proliferation of callus	————

Complete the table

Plasmodium species	Incubation period	Pattern of fever
————	————–	High fever after 48 hours.
————–	28 days	————–
————–	17 days	————-
————	————-	High fever at irregular intervals between 22 to 48 hours.

Epiphytic orchid and mango tree, Ascaris and human, Egret and cattle, Lichen having alga and fungus, Bumblebee and flowering plant, Plasmodium vivax and man.

Column A	Column B
(1) Mutualism	————–
(2) Commensalism	—————
(3) Parasitism	————–

Complete the following table by placing the categories and the given signs + : Benefited ; – : Inhibited ; 0 : Not affected

Interactions	Species
	A	B
1. Neutralism – …………………..
2. Negative interactions …………………………
3. Positive interactions …………………….
4. Both positive and negative interactions …………………………..

Classify the following:
Hormones: Estrogen, Glucagon, Epinephrine, Relaxin, Somatostatin, Nor-Adrenalin

Column A	Column B
(1) Ovary	————
(2) Pancreas	————
(3) Adrenal Medulla	————

Classify the following:
Estuarine waters, Taiga, Aquarium tank, Lake, Evergreen forest, Flower garden.

Types of ecosystems	Examples
(1) Aquatic	————–
(2) Terrestrial	—————
(3) Artificial	————–