PLANT
PHYSIOLOGY
I. Choose the correct answer :
1.
The tropic movement that helps the climbing vines to find a suitable support is
――― .
(a)
Phototropism
(b)
Geotropism
(c)
Thigmotropism
(d)
Chemotropism
[Answer: (c) Thigmotropism]
2.
The chemical reaction occurs during photosynthesis is ――― .
(a)
CO2 is reduced and water is oxidized
(b)
water is reduced and CO2 is oxidized
(c)
both CO2 and water are oxidized
(d)
both CO2 and water are produced
[Answer: (a) CO2 is reduced and water is oxidized]
3.
The bending of root of a plant in response to water is called ――― .
(a)
Thigmonasty
(b)
Phototropism
(c)
Hydrotropism
(d)
Photonasty
[Answer: (c) Hydrotropism]
4.
A growing seedling is kept in the dark room. A burning candle is placed near it
for a few days. The tip part of the seedling bends towards the burning candle.
This is an example of ――― .
(a)
Chemotropism
(b)
Geotropism
(c)
Phototropism
(d)
Thigmotropism
[Answer: (c) Phototropism]
5.
The root of the plant is ――― .
i)
positively phototropic but negatively geotropic
ii)
positively geotropic but negatively phototropic
iii)
negatively phototropic but positively hydrotropic
iv)
negatively hydrotropic but positively phototropic
(a)
(i) and (ii)
(b)
(ii) and (iii)
(c)
(iii) and (iv)
(d)
(i) and (iv)
[Answer: (b) (ii) and (iii)]
6.
The non-directional movement of a plant part in response to temperature is
called ―――.
(a)
Thermotropism
(b)
Thermonasty
(c)
Chemotropism
(d)
Thigmonasty
[Answer: (b) Thermonasty]
7.
Chlorophyll in a leaf is required for ――― .
(a)
photosynthesis
(b)
tropic movement
(c)
transpiration
(d)
nastic movement
[Answer: (a) photosynthesis]
8.
Transpiration takes place through ―― .
(a)
fruit
(b)
seed
(c)
flower
(d)
stomata
[Answer: (d) stomata]
II. Fill in the blanks :
1. The
shoot system grows upward in response to light.
2. root is positively hydrotropic as well as
positively geotropic.
3.
The
green pigment present in the plant is chlorophyll.
4.
The
solar tracking of sunflower in accordance with the path of sun is due to phototropism .
5. The
response of a plant part towards gravity is geotropism
.
6.
Plants
take in carbondioxide for photosynthesis but need oxygen for their living.
III. Match column A with column B
Column
A - Column B
1.
Roots growing downwards into soil. - Positive phototropism
2.
Shoots growing towards the light. - Negative geotropism
3.
Shoots growing upward. - Negative phototropism
4.
Roots growing downwards away from light. - Positive geotropism
Answer:
Column A - Column B
1. Roots growing downwards into soil. - Positive geotropism
2. Shoots growing towards the light. - Positive phototropism
3. Shoots growing upward. - Negative
geotropism
4. Roots growing downwards away from light. - Negative
phototropism
IV. State whether true or false. If false, correct the
statement:
1. The
response of a part of plant to the chemical stimulus is called phototropism.
Answer: False.
Correct statement : The response of a plant part to
the chemical stimulus is called Chemotropism.
2. Shoot is
positively phototropic and negatively geotropic.
Answer: True.
3.
When
the weather is hot, water evaporates lesser which is due to opening of stomata.
Answer: False.
Correct statement : When the weather is hot, water
evaporates more but stomata begin to
close to reduce evaporation.
4.
Photosynthesis produces glucose and carbon dioxide.
Answer: False.
Correct statement: Photosynthesis produces glucose
and oxygen.
5. Photosynthesis
is important in releasing oxygen to keep the atmosphere in balance.
Answer: True.
6. Plants
lose water when the stomata on leaves are closed.
Answer: False.
Correct statement: Plants lose water when the
stomata on leaves are open.
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