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CBSE 11th Standard Biology Subject Structural Organisation in Animals HOT Questions 2 Marks Questions With Solution 2021

Published on: 29/05/2021

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Std: 11th Standard CBSE - Biology

chapter: - HOT Questions

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Questions:

Generic 2

5 x 2 = 10

Differentiate between male and female cockroach.

Malphigian tubules are proto structure of nephron. How?

Cardiac muscle tissues have both character of skeletal and smooth muscles, how? Explain.

What is the unique feature of cardiac muscles?

Why the scientists decalcify the bones?

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Answers Key:

Generic 2

5 x 2 = 10

S.No	Male cockroach	Female cockroach
1	Larger in size	Smaller in size
2	NArrow abdomen	Broad abdomen
3	Anal style present	Absent
4	Brood puch absent	present
5	Testes and associated organs are present	Ovaries and associated organs are present
6	Wings extend beyond the tip of abdomen	Wings extend up to abdomen
7	Chromosome number 2n=33	2n=34

Malphigian tubules are present at the junction of midgut and hindgut of cockroach. They help in removal of excretory products from haemolymph. In higher animals it resembles to nephron.

Cardiac muscle is a type of involuntary muscle found in heart. Cardiac muscle exhibits striations which is characteristics of striated muscles, while it does not work will of animal so it is involuntary characters

The intercalated discs are unique and distingushing features of the cardic muscles . They are dark and zig-zag partition between the adjacent cardiac muscle cells . these discs serve as the firm adhesionn between the adjacent cells, electrical coupling to spread the excitation as well as constraction

The bones have excessive calcification . So it is difficult to sty living cells in an untreated bones. For their study , the bone id first decacified in the same way as architecture of the matrix is studied after drying up of the living materials.