27. Enumerate any five characteristic features of Gymnosperms.
28. Write any five differences between Chondrichthyes and Osteichthyes.
29. Distinguish between skeletal muscle and cardiac muscle with suitable diagrams.
30. Name the cell organelles in which following structures are found:
i) Cisternae
ii) Cristae
iii) Thylakoids
iv) Nucleolus
v) Tonoplast
31. Draw a neat labelled diagram of a typical animal cell.
32. Explain Prophase and Metaphase stages of Mitosis division.
Answers
Answer:
27. They do not produce flowers.
Seeds are not formed inside a fruit. ...
They are found in colder regions where snowfall occurs.
They develop needle-like leaves.
They are perennial or woody, forming trees or bushes.
They are not differentiated into ovary, style and stigma.
29. Skeletal muscle Cardiac muscle
1. The cells of skeletal muscles are unbranched. 1. The cells of cardiac muscles are branched.
2. Intercalated disks are absent.
2. The cells are joined with one another by intercalated disks that help in coordination or synchronisation of the heartbeat.
3. Alternate light and dark bands are present
3. Faint bands are present.
4. They are voluntary muscles.
4. They are involuntary muscles.
5. They contract rapidly and get fatigued in a short span of time.
5. They contract rapidly but do not get fatigued easily.
6. They are present in body parts such as the legs, tongue, hands, etc.
6. These muscles are present in the heart and control the contraction and relaxation of the heart.
32. Metaphase is the phase of mitosis that follows prophase and prometaphase and precedes anaphase. Metaphase begins once all the kinetochore microtubules get attached to the sister chromatids' centromeres during prometaphase.
First image : animal cell 31
second image : 28
Third image : 32
Explanation:
Hope it works.. idk the answer of 30.
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