Chemical Coordination Structured/Applications/Skill Type Ans Concise Biology Selina Solutions for ICSE Class 10 Ch-7. In this article you will get the solutions / answer of Structured / Applications / Skill Type Questions / problems. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.
Chemical Coordination Structured/Applications/Skill Type Ans Concise Biology Selina Solutions for ICSE Class 10 Ch-7
| Board | ICSE |
| Subject | Biology |
| Class | 10 |
| Book | Selina Concise |
| Chapter-7 | Chemical Coordination |
| Topics | Solutions of Structured/Applications/Skill Type Type Questions |
Solutions of Structured/Applications/Skill Type Type Questions on Chemical Coordination
Page 89
Que-1: The tea plants are never allowed to grow lengthwise. This is done by cutting their apical buds, a process known as pruning. In this way, tea plants get a dense growth and easy yield. Answer the following questions:
(a) Name the scientific phenomenon that is being overcome by pruning.
(b) What plant hormone is responsible for the scientific phenomenon mentioned in (a).
(c) Name one plant hormone which inhibits the said phenomenon.
Ans:
(a) Apical dominance
(b) Auxins
(c) Cytokinin
Que-2: The figure given below shows the stages of ripening in a banana. Answer the questions that follow:
(a) Name the plant hormone responsible for the above changes.
(b) Mention two characteristic features of this hormone.
Ans:
(a) Ethylene
(b) Characteristic features of ethylene:
Site of synthesis:
o It is synthesised in senescent leaves and flowers, germinating seeds and ripening fruits.
Functions:
o Induces and promotes fruit ripening
o Promotes fruit ripening
Que-3: The diagram given alongside shows a type of tropism. Study the same and answer the questions that follow :
(a) Name and define the type of tropism shown in the diagram.
(b) Label the guidelines (1) to (4).
(c) Name two effective stimulants that help in the growth of part (2).
(d) Name two groups of plants where part (2) grows towards gametophyte with the help of the stimulants mentioned in (c).
Ans:
(a) Chemotropism. It is the phenomenon of growth of plant organs in response to chemicals.
(b)
(1) Pollen grain,
(2) Pollen tube,
(3) Ovule,
(4) Ovary.
(c) Sugars and peptones.
(d) Gymnosperms and angiosperms.
Que-4: Study the diagrams given below and answer the following questions:
(a) Name the structures shown as X and Y in the figures (A) and (B), respectively.
(b) Write the functions performed by the structures X and Y.
(c) Name the phenomenon depicted and define it.
(d) How do the structures X and Y differ from each other?
(e) Give examples of the plants which show the said phenomenon.
Ans:
(a) X: Stem tendrils, Y : Leaf tendrils.
(b) Function of X and Y : Stem and leaf tendrils enable the plant to climb up a support.
(c) Thigmotropism : It is the growth movement of plant parts in response to touch stimulus.
(d) Stem tendrils (X) arise from the stem while leaf tendrils (Y) arise from the leaf of the plant.
(e) Sweet pea, vines and Cuscuta.
Que-5: Given below are the figures showing some kinds of tropic movements in plants. Study the same and answer the following questions:
(a) Which one of these figures is correct? Give reason in support of your answer.
(b) Name the kind of movements shown by the root system and the shoot system. Define each.
(c) What are the two stimuli which affect root system and shoot system positively? Name them.
(d) Which of the following stimuli affect the growth of root strongly?
- Gravity
- Water
(e) Draw a neat and labelled diagram of the longitudinal section of a pistil showing chemotropism in an angiospermic plant.
Ans:
(a) Figure A is correct as it shows roots growing towards gravity and shoot growing away from gravity.
(b) Root shows positive geotropism and shoot shows negative geotropism.
Positive geotropism is defined as movement of plant towards earth’s gravity. For example, roots show positive geotropism.
Negative geotropism is defined as movement of plant away from gravity. For example, shoot shows negative geotropism.
(c) Root system — Gravity
Shoot system — Light
(d) Water
Reason — For roots, water is a more effective stimulus than gravity.
(e) Below diagram shows chemotropism in a pistil:
Que-6: The figure given below depicts a kind of tropic movement in plants. Study the same and answer the following questions.
(a) What kind of a movement is shown in figure. Define it.
(b) How does this movement differ from geotropism?
(c) Name the stimulus responsible for thigmotropism. Give one example of a plant showing thigmotropism.
(d) Name one stimulus which gives a positive response for the roots but negative response for the shoot.
(e) Draw a neat and labelled diagram of the part of plant showing leaf tendril. Name the plant.
Ans:
(a) Phototropism.
It is defined as the movement in response to the stimulus of light.
(b) Stimulus for phototropism is light whereas for geotropism it is gravity.
(c) Touch is the stimulus for thigmotropism.
Example — The tendrils of sweet pea plant start coiling around the support in response to touch.
(d) Gravity
(e) Sweet pea plant shows thigmotropism. The labelled diagram showing leaf tendril is given below:
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