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.
ü 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 |
ü 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)
ü 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 |
ü 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
ü Answer:
(a) Banana.
2. Some organisms
develop through parthenogenesis. Define this phenomenon and give an example. (2)
ü 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)
ü 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)
ü Answer:
Primates: Menstrual cycle.
Non-primates: Oestrous cycle.
2. Bamboo species and Strobilanthus Kunthiana exhibit usual flowering
phenomena. Explain their flowering characteristics. (2)
ü 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 |
ü 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 |