1. REPRODUCTION IN ORGANISMS
2020
SAY
1. Notice the
organisms given below: (2)
Leech, Cockroach, Dog, Earthworm
(a)
Choose
hermaphrodite organism from the above.
(b)
Define
hermaphrodite.
รผ Answer:
(a) Leech / Earthworm.
(b) It is the organism that has both male and female
reproductive organs.
2. Match the items
of column A with B. (2)
|
A |
B |
|
(a)
Ginger |
I. Bulbil |
|
(b)
Water
hyacinth |
II.
Leaf bud |
|
(c)
Agave |
III.
Tuber |
|
(d)
Bryophyllum |
IV.
Rhizome |
|
|
V. Offset |
รผ Answer:
|
A |
B |
|
(a)
Ginger |
Rhizome |
|
(b)
Water hyacinth |
Offset |
|
(c)
Agave |
Bulbil |
|
(d)
Bryophyllum |
Leaf bud |
2020
MARCH
1. What is a
Clone? (1)
รผ Answer:
It is a morphologically and genetically similar
individuals/ cells.
2. Match the
columns A and B. (2)
|
A |
B |
|
(a)
Rhizome |
i)
Agave |
|
(b)
Bulbil |
ii)
Water
hyacinth |
|
(c)
Offset |
iii)
Ginger |
|
(d)
Leaf buds |
iv)
Potato |
|
|
v)
Bryophyllum |
รผ Answer:
|
A |
B |
|
(a)
Rhizome |
(iii) Ginger |
|
(b)
Bulbil |
(i) Agave |
|
(c)
Offset |
(ii) Water hyacinth |
|
(d)
Leaf buds |
(v) Bryophyllum |
2019
SAY June
1. Choose the
correct answer. (1)
A parthenocarpic fruit is:
a.
Banana
b.
Apple
c.
Strawberry
d.
Guava
รผ Answer:
(a) Banana.
2. Some organisms
develop through parthenogenesis. Define this phenomenon and give an example. (2)
รผ Answer:
Parthenogenesis is the development of unfertilized
egg into a new organism. E.g. Honeybees, some lizards, Turkey etc.
2019
MARCH
1. Write the
asexual reproductive structures given in the diagrams (a), (b), (c) and (d).
(2)
รผ Answer:
(a) Zoospores
(b) Conidia
(c) Bud
(d) Gemmule
2018
SAY June
1. Primate and
non-primate female mammals exhibit cyclic changes in the activities of ovaries
and accessory ducts as well as hormones during the reproductive phase. Name the
cyclic changes in these group. (2)
รผ Answer:
Primates: Menstrual cycle.
Non-primates: Oestrous cycle.
2. Bamboo species and Strobilanthus Kunthiana exhibit usual flowering
phenomena. Explain their flowering characteristics. (2)
รผ Answer:
Bamboo species: Flowering only after 50-100 years. Strobilanthus
Kunthiana: Flowering only once in 12 years.
2018
MARCH
1. Match the
following organisms to their life span. (2)
|
A |
B |
|
1. Butterfly |
a. 140 years |
|
2. Crow |
b. 100 to 150 years |
|
3. Parrot |
c. 1-2 weeks |
|
4. Tortoise |
d. 15 years |
|
|
e. 60 years |
รผ Answer:
|
A |
B |
|
1. Butterfly |
c. 1-2 weeks |
|
2. Crow |
d. 15 years |
|
3. Parrot |
a. 140 years |
|
4. Tortoise |
b. 100 to 150 years |