2018 JULY Improvement (+1)
BOTANY: ANSWERS
1. Kinetochore
2. RuBisCO
3. (iv) All of these
4. (b) Stele.
5. A – Opposite: Leaves lie
opposite to each other (A pair of leaves at each node).
B – Whorled: More than two leaves at
each node
6. Telophase.
Features: Chromosomes cluster at
opposite poles. Reforms nuclear envelope.
7. It is the concentration of
the essential element below which plant growth is retarded.
Deficiency symptoms: Chlorosis, Necrosis,
Stunted growth etc.
8.
|
Column A |
Column B |
|
a.
Prothallus |
iii. Thalloid gametophyte of
pteridophyte |
|
b.
Protonema |
v. Gametophytic stage of mosses |
|
c.
Antheridium |
iv. Male sex organs in bryophytes |
|
d.
Gemmae |
i. Asexual buds in liverwort |
9. 9. A= Lactic acid, B= Ethanol.
Bacteria produces lactic acid. Yeast produces ethanol..
10. Dicot stem.
Features of vascular bundles: Conjoint, open,
cambium present.
11. The inner wall of guard cells
is thick and elastic. Outer wall remains thin.
12. A= FeS
B= UQ
C= Cyt b
D= Cyt C
13. Asparagine & Glutamine.
They are formed from aspartic acid and
glutamic acid by addition of another amino group to each.
14. (a) Nucleolus
(b) Nuclear pores.
Function: Movement of RNA and Protein takes place in both directions
between the nucleus and the cytoplasm.
15. (a) Impermeable and hard
seed coat. Presence of abscisic acids.
(b) Seed coats can be broken by
mechanical abrasions using knives, sand paper / vigorous shaking / application
of gibberellic acid and nitrates.
16.
|
Cyclic photo-phosphorylation |
Non-Cyclic photo-phosphorylation |
|
Only photosystem I is functional. Formation of
ATP only. No oxygen release. |
Formation of ATP & NADPH2. Both photosystem l and photosystem II
are involved. Splitting of water |
17. Actinomorphic / Radial: A
flower can be divided into two equal halves through the centre in any plane.
Zygomorphic / bilateral: A flower can be
divided into two equal halves through the centre only in one plane.
Asymmetric / irregular: A flower cannot be divided into two
equal halves by any plane through the centre.
18. Chloroplast.
Chloroplast contains a membranous
system. It consists of grana, stroma lamellae and matrix stroma.
Each granum is a group of membrane-bound sacs called thylakoids (lamellae). They contain leaf pigments (chlorophyll).