2019 JULY Improvement (+1)
1. c) Trypanosoma
3. d. Pachytene
4. Tolerate high temperature, Lack of photorespiration, Kranz anatomy etc.
5. Oxygen binds with RuBisCO and breaks RuBP into one molecule of phosphoglycerate and phosphoglycolate.
6. a) Hydroponics
b) Commercial production of vegetables, Identification of essential elements, Discovery of deficiency symptoms.
7. Each plant part takes care of its own gas exchange needs.
Plants do not have great demands for gas exchange.
8. (a) Plasticity is a phenomenon in which plants follow different pathways in response to environment or phases of life to perform different kind of structures.
(b) Phenomenon of heterophylly in cotton, coriander, larkspur, or buttercup.
9. (a) Cytoplasm
(b) Glucose undergoes partial oxidation to form two molecules of pyruvic acid.
10 (a) Anaphase
(b) Centromere split and chromatids separate. Chromatids move to opposite poles.
12. > Creates transpiration pull for absorption and transport of plants.
> Supplies water for photosynthesis.
> Transports minerals from the soil to all parts of the plant.
> Cools leaf surfaces.
> Maintains shape and structure of plants by keeping cells turgid.
iii. Coralloid roots
c. Gametophyte of Pteridophytes
d. Sporangia bearing leaves
e. Nitrogen fixation
14. Endoplasmic reticulum(ER), Golgi complex, Vacuoles.
Lysosomes possesses hydrolytic enzymes.
15. Non-cyclic photo-phosphorylation:
- It occurs when the two photosystems work in a series (PS II and PS I).
- ATP & NADPH + H+ are synthesised.
- It is a non-cyclic process because the electrons lost by PS II do not come back to it but pass on to NADP+.
- It occurs in stroma lamellae when only PS I is functional.
- The electron is circulated within the photosystem and the ATP synthesis occurs due to cyclic flow of electrons.
- Only ATP is synthesised.
· Presence of hypodermis
· Exarch xylem
· Palisade parenchyma cells
· Conjoint and open vascular bundles
· Endodermis with casparian strips
· Large empty bulliform cells
17. (a) Liliaceae
(b) Tricarpellary, syncarpous, superior ovary
(c) Aloe, Asparagus, Tulip
18. (a) Fluid mosaic model
(c) Integral proteins, Peripheral or extrinsic proteins.