Advertisements
Advertisements
प्रश्न
Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow : 
What is Thigmotropism? Give one example.
उत्तर
Thigmotropism is a directional movement which occur as a mechanosensory response to a touch stimulus. It is typically found e.g. Touch me not plant.
APPEARS IN
संबंधित प्रश्न
Give biological reasons for the following statements : In some xerophytes leaves are modified into spines
Give biological explanations for Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered.
Describe an experiment to prove that sunlight is necessary for photosynthesis.
An experiment was set up as shown in the figure alongside. Look at the figure and answer the following questions:
( i) What is the objective of this experiment?
( ii ) Which plant is used in this experiment?
( iii ) Which gas is evolved in this process?
( iv ) What will happen to the rate of evolution of this gas if a pinch of sodium
bicarbonate is added?
(v ) What will happen if the apparatus is kept in dark?
The following statement is about photosynthesis in a green plant. Write whether it is True or False.
Photosynthesis results in a gain in dry weight.
Fill in the blank:
Photosynthesis produces oxygen and ______.
Choose the correct answer:
Which of the following gas is used in photosynthesis?
Name the following:
The first form of food substance produced during photosynthesis.
Mention one difference between the following on the basis of what is given in bracket.
Grass and grasshopper (mode of nutrition)
A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black 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.
Is there any control in this experiment? If so, state it.
What is the importance of photosynthesis in the life of the following:
Non-green plants
Explain, why respiration is said to be a reversed process of photosynthesis?
Explain the term Plastoquinone.
Explain the term NADP.
Write the functional activity of the following structure:
Granum
Write the functional activity of the following structure:
Stroma
Autotrophs use _____,______ and chlorophyll to prepare their own food.
Which one of the following is a primary producer?
State whether true or false. If false, correct the statement.
Plants lose water when the stomata on leaves are closed.
Study the pictures below and then complete the table by putting a plus (+) if the shoot or root grows towards the stimulus and a minus (-) if it grows away from it.
| Stimulus | Light | Gravity |
| Shoot | + | - |
| Root | ? | + |
