2019 JULY Improvement (+1)
BOTANY: ANSWERS
1. c) Trypanosoma
2. Ethylene
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.
11.
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.
13.
|
A |
B |
|
i. Prothallus ii. Sporophylls iii. Coralloid roots iv. Protonema |
c. Gametophyte of Pteridophytes d. Sporangia bearing leaves e. Nitrogen fixation a. Mosses |
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+.
Cyclic photo-phosphorylation:
- 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.
16.
|
STEM |
ROOT |
LEAF |
|
· 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
(b) Lipids/Phosphoglycerides
(c) Integral proteins, Peripheral or extrinsic proteins.