Friday, October 30, 2020

2020 March | HSE +1 Exam | Botany - Answers

 2020 March (+1)
BOTANY: ANSWERS

1.   (c) Mitochondrion


2.   (a) Dicot root


3.   Euglena.


4.   Anaphase


5.   2


6.   (a) Facilitated diffusion (Facilitated transport)

(b) It is the diffusion of hydrophilic substances across a membrane along the concentration gradient through some transport proteins.


7.   (a) Synapsis

(b) Pachytene

(c) Diplotene

(d) Terminalisation of chiasmata.


8. The technique of growing plants in a defined nutrient solution (without soil) is known as hydroponics.

Advantage: It is used to identify the essential elements required for plants and their deficiency symptoms.


9.        

Lysosome

Golgi apparatus

Ribosome

Rich in hydrolytic enzymes

Made up of many flat, disc shaped sacs or cisternae

·   Involved in protein synthesis

·   Membrane is absent


10. (a) Non-cyclic

(b) 1

(c) 2

(d) Absent


11. (a) Glycolysis is the breakdown of glucose in to pyruvic acid.

(b) Cytoplasm.


12. (a) A= Mesophyll Cell, B= Bundle sheath cell

(b) OAA/ Malic acid / Aspartic acid

(c) PEP carboxylase (PEP case)


13. (a) Anaerobic respiration is the incomplete oxidation of glucose in the absence of oxygen.

(b) Pyruvic acid is converted to ethanol and CO2.


14. (a) Carboxylation, Reduction, Regeneration.

(b) First stable product is a C3 compound (3-PGA).


15.    

(A)

(B)

a)       Double fertilisation

v. Angiosperm

b)      Heterospory

iv. Pteridophyte/ Gymnosperm/ Angiosperm

c)       Protonema

i. Bryophyte

d)      Naked seeds

iii. Gymnosperm

 16. (a) Schleiden and Schwann

(b) All living organisms are composed of cells and product of cells. 

      All cells arise from pre-existing cells.


17. (a) A= Twisted, B. Vexillary/ Papilionaceous

(b) One margin of each member overlap that of the next one.

(c) Standard petal, wing petals, keel petal (anterior small petal).


18. (a) Auxin, Cytokinin, Gibberellin.

(b) Abscisic acid (ABA)

(c) Inhibit seed germination. Helps to withstand desiccation.


19. (a) A= Reticulate venation, B= Parallel venation.

(b) It is the arrangement of veins and veinlets in the leaf lamina.


20. Present between upper and lower epidermis.

Made up of parenchyma cells.

Divided in to palisade and spongy parenchyma.


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