Advertisements
Advertisements
Question
When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings. Which of the following is the term given to such openings?
Options
Stomata
Lamina
Midrib
Veins
Advertisements
Solution
Stomata
Explanation:
Lamina is the green expanded part of the leaf with veins and veinlets. Midrib is middle prominent vein. Veins provide rigidity to leaf and act as channels for the transport of water, minerals and food materials. Stomata are the minute pores usually located on the underside of the leaves and take part in the exchange of gases (O2 and CO2) during photosynthesis and respiration. They are surrounded by guard cells.
APPEARS IN
RELATED QUESTIONS
Define the following:
Saprozoic
Spot the following in the table of vitamins and minerals.
Essential mineral for healthy bones and teeth.
Classify according to food-type.
Goat
Classify according to food-type.
Tick
Higher Order Thinking Skill.
Look at the picture and answer the question that follows
- Name the process involved in the given picture.
- Which diary food is preserved by this process?
- What is the temperature required for the above process?
Which is the first enzyme to mix with food in the digestive tract?
Paheli avoids eating vegetables but likes to eat biscuits, noodles and white bread. She frequently complains of stomachache and constipation. What are the food items that she should include in her diet to get rid of the problem? Give reason for your answer.
‘Water does not provide nutrients, yet it is an important component of food’. Explain.
Assertion (A): Amoeba takes in food using finger like extensions of the cell surface.
Reason (R): In all unicellular organisms, the food is taken in by the entire cell surface.
Take a potted plant with broad leaves. Take two strips of black paper and cut out a small square in the centres. Cover a part of two leaves with these papers and secure them with paper clips Figure. Keep the plant in sunlight for 2–5 days. Observe the difference in the colour of the covered and the uncovered portions on the leaf. Perform iodine test on this leaf. Did the two parts show different results? Now take second leaf. Remove the strip and expose the covered part to the sunlight for 2–3 days and do the iodine test again. Describe your observations.
