Science Concepts Classes
FOR IX & X (C.B.S.E.)
BY-ANAND MITTAL
M-9258306985
Q1. Which one of the meristematic tissue is also called cambium? What is its
function?
Q2. State how the epithelium is usually separated from the underlying tissue.
Q3. Write the name of most abundant muscular tissue found in our body.
Q4. What is differentiation of meristematic tissues?
Ans. It is the process by which meristematic tissues take-up a permanent
shape, size and function.
Q5. Which epithelium is present in the inner lining of the intestine whose
absorption and secretion occurs?
Q6. Name the tissue which forms subcutaneous layer.
Q7. What is the function of sieve tube cells and how are they designed to carry
out their function?
Ans. Sieve tube cells are tubular cells with perforated walls. At the both ends
of sieve tube, the perforated sieve plate is present. Through these sieve
plates the food materials can move in both directions.
Q8. List two characteristics of cork cells which help them to function as
protective tissue.
Q9. Name the tissue found in the following locations: (a) Haversian canal (b)
Chondrocyte (c) Eosinophils Give one function of each of these.
Q10. Write four characteristic features of parenchyma tissue. How would you
classify this tissue based upon its specialized functions? What are these
functions?
Q11. List the characteristics of cork. How are they formed? Mention their role.
Q12. Do the cells of collenchymas tissue have intercellular space? Why or why
not?
Q13. Water hyacinth floats on water surface. Explain.
Q14. Give the characteristic of tracheids and vessels. What is the advantage of
such characteristic?
Ans. Tracheids and vessels have tubular structures. This allows them to
transport water and minerals vertically.
Q15. Explain, with help of a well labeled diagram, the structure and functions
of phloem tissue.
Q16. As plants grow older, the outer protective tissue of stem changes into
cork. How does this happen ? List two salient features of cork.
Q17. Explain the significance of numerous layers of epidermis in cactus.
Ans. Plants living in very dry habitats have thick epidermis and entire surface
of the plants have this outer covering of epidermis. It protects them from
loss of water, mechanical injury and parasitic invasion.
Q18. Name the tissue whose cells are highly specialized for being stimulated
and transmitting the stimulus from one place to another within the body.
Mention three organs in our body which are composed of this tissue.
What are the cells of this tissue called? Name two tissues in animals the
combination of which enables animals to move rapidly in response to
stimuli.
Q19. Are plants and animals made of same types of tissues? If not, then write
three points of differences.
Q20. State the feature of cardiac muscles which makes it unique.
Q21. What are ligaments? what do you expect to feel if they are over
stretched ?
Q22. We get a crunchy and granular feeling, when we chew pear fruit.
Q23. Tracheids and vessels of xylem have tubular structures. What is its
advantage ?
Ans. This allows them to transport water and minerals vertically.
Q24. There is no such demarcation of dividing and non-dividing regions in
animals why?
Ans- Because cell growth in animals is more uniform.
Q25. Discuss the cell arrangement which supports the fact that epidermis is a
protective tissue.
Ans. The epidermal cells on the aerial parts of the plant secrete a waxy, water
resistant layer on their outer surface.
Epidermal cells are flat and form a continuous layer without intercellular
spaces.
The outer and side walls of epidermal cells are thicker than the inner
wall.
Q26. Give reason:
1. The outer and side walls of epidermal cells are thick.
2. The epidermal tissues is in the form of a continuous layer and there are no
intercellular spaces present.
3. In desert plants, epidermis has thick waxy coating of cutin.
Q27. Give reasons for the following:
1. Bark of a tree is impervious to gases and water.
2. In desert plants, epidermis has a thick waxy coating.
3. Epidermal cells of the roots generally have hair like parts.
Q28. Give reason for the following:
1. The cells of meristematic tissue have dense cytoplasm, thin walls and
prominent nuclei.
2. Vacuoles are absent in the cells of this tissues.
Q29. Indentify the type of meristem present in the following :
(i) . At that base of leaves.
(ii). Girth of stem increases due to this.
(iii). Increases the length of the stem.
Q30. Give one important functional difference amongst the muscle tissues and
draw a labeled diagram of the muscle tissue which never shows fatigue?
Q31. Give the characteristics and role of the following: (i) Cutin (ii) Suberin
(iii) Sclereids :
Q32. Write two similarities and three differences between striated and cardiac
muscles.
Ans. Similarities:
1. Both have dark and light stripes (striations or bands)
2. Both consist of long, narrow, cylindrical fibres with blunt ends.
Differences :
Striated Muscles
Cardiac Muscles
1. Form more than 80% of the mass of 1. They are found in heart only.
soft tissues (body wall and limbs)
2. They are unbranched.
2. They are composed of branched cells.
3. The cells are multinucleated.
3. The cells are uninucleated (have a
single nucleus per cell).
4. They are voluntary.
4. They are involuntary.
Q33. Name the reason of plant where meristematic tissue are usally found.
Give the position and function of various types of meristemaic tissue.
Q34. Why mode of life pursued by complex plants is totally different from
those of complex animals?
Ans. The structural organization of organs and organs system is far more
specialized and localized in complex animals than even in very complex
plants. This fundamental difference reflects the different modes of life
pursued by these two major groups of organisms, particularly in their
different feeding methods.
Q35. Draw a diagram of epidermis of the leaf showing surface view and label
stomata with guard cell and epidermal cell.
Q36. Answer the following:
1. How the epidermis of the plant living in very dry habitats is adapted?
2. Write functions of guard cells of stomata in the leaf.