SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Carbon forms only covalent compounds. Why?

Define taxonomy.

The chemical reaction occurs during photosynthesis is ______.

______ is positively hydrotropic as well as positively geotropic.

The green pigment present in the plant is ______.

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.

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

Plants lose water when the stomata on leaves are closed.

Name the plant part 

1. Which bends in the direction of gravity but away from the light.
2. Which bends towards light but away from the force of gravity.

Photosynthesis converts energy X into energy Y.

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

To which directional stimuli do 

1. roots respond
2. shoots respond?

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.

Match the following

Define the following.

Bacteriophages

Distinguish between Virion and Viroid.

Explain the various types of viruses with examples.

The symbiotic association of fungi and vascular plants is ______.

Say true or false. If false, correct the statement.

Mycorrhiza is an algae.

The incident angle of a ray of light is 30°. The angle between the incident ray and the reflected ray is ______.

The bouncing back of light from a surface is called ______.