BIOLOGY CH19 Plant Physiology Science - BIOLOGY CH19 Plant Physiology

The non-directional movement of a plant part in response to temperature is called ______.

The root of the plant is ______.

1. positively phototropic but negatively geotropic 
2. positively geotropic but negatively phototropic
3. negatively phototropic but positively hydrotropic 
4. negatively hydrotropic but positively phototropic

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 ______.

The bending of root of a plant in response to water is called ______.

The chemical reaction occurs during photosynthesis is ______.

Assertion (A) : The loss of excess water from the aerial parts of the plant in the form of water vapour is known as transpiration. Reason (R) : Stomata of the leaf perform transpiration.

Assertion (A) : If the plant part moves in the direction of gravity, it is called positive geotropism. Reason (R) : Stem shows positive geotropism.

Higher Order Thinking Skill.

There are 3 plants A, B and C. The flowers of A open their petals in bright light during the day but closes when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but closes during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.

1. Name the phenomenon shown by the flowers of plant A and B.
2. Name one plant each which behaves like the flowers of plant A and B. 
3. Name the phenomenon exhibited by the leaves of plant C. 
4. Name the plant which behaves like the leaves of plant 'C'?

To which directional stimuli do 

1. roots respond
2. shoots respond?

Mention the differences between stomatal and lenticular transpiration.

Photosynthesis converts energy X into energy Y.

1. What are X and Y?
2. Green plants are autotrophic in their mode of nutrition. Why?

An organism A which cannot move from one place to another makes a simple food B from the substances C and D available in the environment. This food is made in the presence of green coloured substance E present in organs F in the presence of light energy in a process called G. Some of the simple food B also gets converted into a complex food H for storage purposes. This food gives blue-black colour with iodine solution?

Match column A with column B.

Column A	Column B
Roots growing downwards into soil.	Positive phototropism
Shoots growing towards the light.	Negative geotropism
Shoots growing upward.	Negative phototropism
Roots growing downwards away from light.	Positive geotropism

Higher Order Thinking Skill.

Imagine that student A studied the importance of certain factors in photosynthesis. He took a potted plant and kept it in dark for 24 hours. In the early hours of the next morning, he covered one of the leaves with dark paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.

1. What aspect of photosynthesis was being investigated? 
2. Why was the plant kept in the dark before the experiment? 
3. How will you prove that starch is present in the leaves?
4. Name the raw materials needed for photosynthesis.

How will you differentiate the different types of transpiration?

Differentiate between tropic and nastic movements

Write the types of tropism.

Write a note on Transpiration.

Plants take in carbondioxide for photosynthesis but need ______ for their living.

The response of a plant part towards gravity is ______.

The solar tracking of sunflower in accordance with the path of sun is due to ______.

The green pigment present in the plant is ______.

______ is positively hydrotropic as well as positively geotropic.

Suppose you have a rose plant growing in a pot, how will you demonstrate transpiration in it?

What is the difference between movement of flower in sunflower plant and closing of the leaves in the Mimosa pudica?

Name the part of plant which shows positive geotropism. Why?

What is chlorophyll?

State whether true or false. If false, correct the statement.

Plants lose water when the stomata on leaves are closed.

• True

• False

State whether true or false. If false, correct the statement.

Photosynthesis is important in releasing oxygen to keep the atmosphere in balance.

• True

• False

State whether true or false. If false, correct the statement.

Photosynthesis produces glucose and carbon dioxide.

• True

• False

State whether true or false. If false, correct the statement.

When the weather is hot, water evaporates lesser which is due to opening of stomata.

• True

• False

State whether true or false. If false, correct the statement.

Shoot is positively phototropic and negatively geotropic.

• True

• False