2018 MARCH (+1)
BOTANY: ANSWERS
1) Heterocysts.
2) Aleuroplast (proteinoplast).
3) Epiphyllous.
4) OAA
5)
|
A |
B |
|
a)
Calotropis |
ii)
Valvate |
|
b)
China rose |
iii)
Twisted |
|
c)
Cassia |
iv)
Imbricate |
|
d)
Pea |
i)
Vexillary |
6) a) Secondary xylem
b) Metaxylem
c) Exarch
d) Stem
7) Centrioles or centrosomes.
Function: Takes part in the formation of
spindle apparatus during cell division.
8) Chlorosis
Necrosis
Brown spots surrounded by chlorotic
veins etc.
9) FADH2 – Between the
conversion of succinic acid to malic acid.
GTP - Between the conversion of a-ketoglutaric
acid to succinic acid.
10) Plant: Marchantia.
Asexual bud: Gemma
Features: Gemma are green,
multicellular, asexual/ vegetative buds which develop in small receptacles.
11) Requires special membrane
proteins.
Highly selective.
Transport saturates.
Not requires ATP energy.
12) Plants follow different
pathways in response to environment or phases of life to form different kinds
of structures. It is called plasticity.
Eg: Heterophylly in Cotton, Coriander
and Larkspur etc.
13) Cytoplasm.
4 ATP.
14) (a) Palisade parenchyma and
spongy parenchyma.
(b)
|
Dicot leaf |
Monocot leaf |
|
Stomata on abaxial(lower) epidermis. |
Stomata are present on both surfaces
of the epidermis. |
|
Dorsiventral leaf. |
Isobilateral leaf. |
|
Bulliform
cells are absent. |
Bulliform
cells are present. |
15) Plant factors: Number, size, age, orientation of leaves,
mesophyll cells, chloroplasts etc.
External factors: Availability of
sunlight, temperature, water, nutrients, C02 concentration etc.
16) Prophase I
Leptotene, Zygotene, Pachytene, Diplotene,
Diakinesis.
17) (a) 2,4-D ( 2,4-
Dichlorophenoxy acetic acid) /Auxin
(b) Gibberellin/Auxin
(c) Ethylene/Auxin
(d) Auxin
(e) Abscisic acid (ABA)
(f) Ethylene/ Ethephon
18)
|
Anaphase
/ karyokinesis |
Centromere
splits and chromosomes move to opposite poles. |
|
Telophase
/ Karyokinesis |
Chromosomes
cluster at opposite poles and nuclear envelope assembles around. |
|
Prophase
/ Metaphase / karyokinesis |
Chromosomes
seems to be with two chromatids attached at centromere. |
|
Metaphase
/ karyokinesis |
Chromosomes
arranged at spindle equator. |
|
Anaphase
/ karyokinesis |
Separation
of daughter chromosomes |
|
Cytokinesis |
Division
of cytoplasm |