Biology Times March 19
- “Bird flu” or Avian influenza is caused by
(a) Highly pathogenic animal virus
(b) Highly pathogenic avian virus
(c) Highly pathogenic bacteria
(d) Highly pathogenic fungi
- b 2. a 3. d 4. d 5. a
- a 7. a 8. d 9. c 10. d
- c 1 2. b 1 3. a 14. b 15. d
- c 17. c 18. d 19. c 20. d
2 1. c 2 2. b 2 3. d 24. a 25. c
- a 27. b 28. c 29. d 30. a
- a 32. b 33. d 34. c 35. c
- b 37. d 38. c 39. d 40. b
- c 42. c 43. a 44. d 45. b
2.Sol: Holotype is the one specimen or other element
designated by author as nomenclature type.
3.Sol: Alginic acid is an anionic polysaccharide
distributed widely in the cellwalls of many
brown algae (Phaeophyceae), it is a phycocolloid
which is obtained commercially from Laminaria,
Macrocystis, Nereocystis, Fucus, Sargassum etc.,
4.Sol: Linnaeus used the character of sex and
androecium for his classification, it is Artificial
system of classification.
5.Sol: Anemophily is pollination through wind or
water.
6.Sol: Dicot plants possess tap root system.
7.Sol: A compact head of a structure, in particular a
dense flat cluster of small flowers or florets.
8.Sol: Special type of seed germination characteristic
of halophytes growing in saline conditions is
vivipary. The seed germination occurs inside the
fruit while it is attached to the parent plant.
10.Sol: Sclerenchyma cells consists of lignin deposi
tion which is of two types fibres and sclereids.
Fibres are the lignified sclerenchyma cells which
are fusiform in shape,narrow and tapering.
11.Sol: The endodermis is the innermost layer of
cortex in some land plants which is helpful for
apoplastic flow of water inside the cells
12.Sol: Bacteria is a member of kingdom Monera, it is
a prokaryote and lacks membrane bound organelles
14.Sol: A granum is a coin-shaped stack of thylakoids,
which are the membrane-like structures found
inside the chloroplasts of plant cell.
15.Sol: Microbodies are single membrane covered
small cell organelles which take part in oxidation
reactions other than those of respiration. They
are of different kinds that include Peroxisomes,
Glyoxysomes and Melanosomes.
18.Sol: Cellulose is a Homopolymer. Some other
homopolymers include glycogen, amylose,
amylopectin and chitin.
19.Sol: Chitin is a polysaccharide that has nitrogen
and is a derivative of glucose.
21.Sol: PS II is present in the appressed part of granal
thylakoids. PS I is present in stroma thylakoids
and non-appressed part of granal thylakoids.
23.Sol: Chaismata is the point at which paired
homologous chromosomes remain in contact as
they begin to separate during the first prophase
of meiosis, forming a cross shape (X- shaped
structure). A number of chaismata can usually be
identified and at these points crossing over takes
places.
24.Sol: Oxalo acetic acid has 4 carbon atoms,
α-ketoglutaric acid has 5 carbon atoms and citric
acid has 6 carbon atoms.
25.Sol: Efficiency index is the rate of growth. It is
measured by calculating increase in size, diameter
or area per unit time.
26.Sol: Cell is the smallest viable unit which can
grow, multiply and form a plant in tissue culture.
27.Sol: Fruit fly has least life span and Banyan tree
has high life span.
28.Sol: In Mound layering the shoot is pruned and
its lower part is covered with soil
29.Sol: Apomixis in flowering plants is defined as
the asexual formation of a seed from the maternal
tissues of the ovule, avoiding the processes of
meiosis and fertilization, leading to embryo
development.
