Download App

Control and Coordination — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceControl and Coordination5 Marks
Question
While conducting experiments to study the effect of various stimuli on the plants, it was observed that the roots of a plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X, however, bends away from stimuli A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to too much weight of the earth. Keeping these points in mind, answer the following question:
  1. What could stimulus A be?
  2. Name the stimulus B.
  3. What could stimulus C be?
  4. The branches of a fallen tree in a forest grow straight up in response to two stimuli. What could be these two stimuli out of A, B and C? Also name these two stimuli.
✓

Answer

  1. The stimulus A is water.
  2. The stimulus B is gravity.
  3. The stimulus C is light.
  4. The two stimuli responsible for the straight growth of the branches of a fallen tree are B and C, i.e., gravity and light, respectively.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[5 marks Questions]" from Control and Coordination→Control and Coordination — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Give the various functions of brain.
→
When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory.
  1. What could be solid X? Write its chemical formula.
  2. What could be product Y? Write its chemical formula.
  3. What is the common name of the solution of Y which is used for testing carbon dioxide gas?
  4. Write chemical equation of the reaction which takes place on adding water to slid X.
  5. Which characteristic of chemical reactions is illustrated by this example?
→
Give your view point about the conservation of natural resources.
→
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
  1. What is the nature of spherical mirror?
  2. Why is a hole burnt in the carbon paper?
  3. At which point of the spherical mirror the carbon paper is placed?
  4. What name is given to the distance between spherical mirror and carbon paper?
  5. What is the advantage of using a carbon paper rather than a white paper?
→
a. Name any two bacterial infections that are sexually transmitted. How can they be prevented?
b. List three different ways, other than the one stated in (a) above, that help an individual to avoid unwanted pregnancies.
c. List three advantages for adopting contraceptive measures.
→
Give one example each of unisexual and bisexual flowers. Differentiate between the two types of pollination that occur in flowers. What happens when a pollen lands on a suitable stigma? Write about the events that occur till the seed formation in the ovary.
→
What are carboxylic acids? Give the common names, IUPAC names and structural formula of first four members of the homologous series.
→
Reproduction is essentially a phenomenon that is not for survival of an individual but for the stability of a species. Justify.
→
In a village in Karnataka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers.
Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake.
→
What are the scientific names for the following receptors in animals?
  1. Receptors for light.
  2. Receptors for heat.
  3. Receptors for sound.
  4. Receptors for smell.
  5. Receptors for taste.
→