{"id":40154,"date":"2024-02-17T08:52:39","date_gmt":"2024-02-17T03:22:39","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=40154"},"modified":"2024-02-17T16:32:17","modified_gmt":"2024-02-17T11:02:17","slug":"plus-one-zoology-chapter-wise-questions-answers-chapter-3","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/plus-one-zoology-chapter-wise-questions-answers-chapter-3\/","title":{"rendered":"Plus One Zoology Chapter Wise Questions and Answers Chapter 3 Structural Organisation in Animals"},"content":{"rendered":"
Plus One Zoology Chapter Wise Questions and Answers\u00a0Chapter 3 Structural Organisation in Animals <\/strong>is part of Kerala Plus One Zoology Chapter Wise Questions and Answers<\/a>. Here we have given Plus One Zoology Chapter Wise Questions and Answers Chapter 3 Structural Organisation in Animals.<\/p>\nKerala Plus One Zoology Chapter Wise Questions and Answers Chapter 3 Structural Organisation in Animals<\/h2>\nPlus One Structural Organisation in Animals One Mark Questions and Answers<\/h3>\n
Question 1.
\nWhich one of the following types of cell is involved in making of the inner walls of large blood vessels?
\n(a) Cuboidal epithelium
\n(b) Columnar epithelium
\n(c) Squamous epithelium
\n(d) stratified epithelium
\nAnswer:
\n(c) Squamous epithelium<\/p>\n
Question 2.
\nTo which one of the following categories does adipose tissue belong?
\n(a) Epithelial
\n(b) Connective
\n(c) Muscular
\n(d) Neural
\nAnswer:
\n(b) Connective<\/p>\n
Question 3.
\nWhich one of the following is not a connective tissue?
\n(a) Bone
\n(b) Cartilage
\n(c) Blood
\n(d) Muscles
\nAnswer:
\n(d) Muscles<\/p>\n
Question 4.
\nWhich one of the following statements is true for cockroach?
\n(a) The number of ovarioles in each ovary are ten.
\n(b) The larval stage is called caterpillar
\n(c) Anal styles are absent in females
\n(d) They are ureotelic
\nAnswer:
\n(c) Anal styles are absent in females<\/p>\n
Question 5.
\nMatch the following with reference to Cockroach and choose the correct option.<\/p>\n
\n\n\nA. Phallomere<\/td>\n | i. Chain of developing ova<\/td>\n<\/tr>\n |
\nB. Gonopore<\/td>\n | ii. Bundles of sperm<\/td>\n<\/tr>\n |
\nC. Spermatophore<\/td>\n | iii. Opening of the ejaculatory dust<\/td>\n<\/tr>\n |
\nD. Ovarioles<\/td>\n | iv. The external genitalia<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n (a) A – iii, B – iv, C – ii, D – i \n(b) A – iv, B – iii, C – ii, D – i \n(c) A – iv, B – ii, C – iii, D – i \n(d) A – ii, B – iv, C – iii, D – i \nAnswer: \n(b) A – iv, B – iii, C – ii, D – i<\/p>\n Question 6. \nComplete the following sentences:<\/p>\n \n- The most common species of frog found in India is<\/li>\n
- Blood Vascular system of cockroach is<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Ranatigrina<\/li>\n
- Open<\/li>\n<\/ol>\n
Question 7. \nName the respiratory organs of insects. \nAnswer: \nTrachea<\/p>\n Question 8. \nNote the relationship between the first two words and suggests a suitable word.<\/p>\n \n- \u00a0Dendrons: Dendrites
\nAxon: _________<\/li>\n - Mast cells: Histamine
\nFibroblast: ________<\/li>\n<\/ol>\nAnswer:<\/p>\n \n- Myelin sheath<\/li>\n
- Fibres<\/li>\n<\/ol>\n
Question 9.<\/p>\n \n- Which among the following is the bone cell _____________.
\n(Leucocyte, Chondrocyte, Osteocyte, Thrombocyte)<\/li>\n - In earthworm, segments 14-16 are covered by a prominent dark band of glandular tissue called __________. (Setae, Clitellum, Typlosol, None of these)<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Osteocyte<\/li>\n
- Clitellum<\/li>\n<\/ol>\n
Question 10. \n\u2018Neuroglia make up more than one half the volume of neural tissue in our body\u2019. Write the function of neuroglial cells. \nAnswer: \nNeuroglia cells protect and support neurons in our neural system.<\/p>\n Question 11. \nFrom the following segments, find out the segments in which, Clitellum is situated in a mature earthworm. \n(a) 12-16 \n(b) 14 -16 \n(c) 10-14 \n(d) 16-18 \nAnswer: \n(b) 14 -16<\/p>\n Question 12. \nName the cells present in areolar tissue. \nAnswer: \nFibroblasts, Macrophages, Mast cells<\/p>\n Question 13. \n_____________ make up more than one half the volume of neural tissue in our body. \nAnswer: \nNeuroglia<\/p>\n Question 14. \nGiven below are different types of epithelial tissues. Find out the tissue that are present in the tubular parts of nephrons in kidneys. \nAnswer: \nCuboidal<\/p>\n Question 15. \nHeart is made of \n1. Epithelial tissue and Muscular tissue. \n2. Muscular tissue and neural tissue. \n3. Musculartissue and connective tissue. \n4. All the four types of tissues. \nAnswer: \n4. All the four types of tissues.<\/p>\n Question 16. \nWrite the cellular components of blood. \nAnswer: \nRed blood cells (RBC), White blood cells (WBC) and platelets.<\/p>\n Question 17. \nIn earthworm, setae are absent in the segments. \n(a) First and last \n(b) Clitellum only \n(c) First, last and clitellum \n(d) Peristomium and Clitellum \nAnswer: \n(c) First, last and Clitellum.<\/p>\n Question 18. \nIntestine of earthworm contain a special organ which help in absorption. Identify the organ. \nAnswer: \nTyphlosole<\/p>\n Question 19. \nName the structures which help in locomotion in Earthworm. \nAnswer: \nSetae<\/p>\n Question 20. \nIn cockroach the fertilized eggs are encased in capsule called __________ \nAnswer: \nOothecae<\/p>\n Plus One Structural Organisation in Animals Two Mark Questions and Answers<\/h3>\nQuestion 1. \nRegarding the blood vascular system of frog, some statements are given below. Check whether these are True or False and make corrections if necessary.<\/p>\n \n- Open type.<\/li>\n
- Sinus venosus join the right atrium.<\/li>\n
- RBC is non-nucleated.<\/li>\n
- Circulation is achieved by the pumping action of the heart.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- False – Closed type<\/li>\n
- True<\/li>\n
- False – RBC is nucleated<\/li>\n
- True<\/li>\n<\/ol>\n
Question 2. \nYou are given two cockroaches and the teacher asked to display the mouthparts of male cockroach.<\/p>\n \n- How will you identify the male cockroach<\/li>\n
- Name the mouthparts of cockroach.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- In males styles are present and the abdomen is narrow and V shaped. In females abdomen is broad and anal styles are absent.<\/li>\n
- Labrum, mandibles, Hypopharynx, maxilla and Labium.<\/li>\n<\/ol>\n
Question 3. \nGive one word for the following.<\/p>\n \n- Tissue attach one bone to another.<\/li>\n
- The structures protect and support neurons in neural system.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Ligaments<\/li>\n
- Neuroglial cell<\/li>\n<\/ol>\n
Question 4. \nMatch the following.<\/p>\n \n\n\nA<\/td>\n | B<\/td>\n<\/tr>\n | \nCuboidal epithelium<\/td>\n | Fallopian tube<\/td>\n<\/tr>\n | \nSquamous epithelium<\/td>\n | Ducts of glands<\/td>\n<\/tr>\n | \nColumnar epithelium<\/td>\n | alveoli<\/td>\n<\/tr>\n | \nCiliated epithelium<\/td>\n | intestine<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer:<\/p>\n \n\n\nA<\/td>\n | B<\/td>\n<\/tr>\n | \nCuboidal epithelium<\/td>\n | Ducts of glands<\/td>\n<\/tr>\n | \nSquamous epithelium<\/td>\n | alveoli<\/td>\n<\/tr>\n | \nColumnar epithelium<\/td>\n | intestine<\/td>\n<\/tr>\n | \nCiliated epithelium<\/td>\n | Fallopian tube<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 5. \nCopy the diagram and label the numbered parts. \n \nAnswer:<\/p>\n \n- Pharynx<\/li>\n
- Gizzard<\/li>\n
- Intestinal caecum<\/li>\n
- Typhlosole<\/li>\n<\/ol>\n
Question 6. \nObserve the diagram \n<\/p>\n \n- Name the above connective tissue. Where they found in our body?<\/li>\n
- Name any two principle cell found in it.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Areolar connective tissue, present beneath the skin.<\/li>\n
- Fibroblast and macrophage<\/li>\n<\/ol>\n
Question 7. \nObserve the pool of connective tissues carefully. Classify them under three headings. \n \nAnswer: \n<\/p>\n Question 8. \nAnatomical structures of 3 animals are given below. Identify the 3 animals and arrange the structures into 3 separate groups.\u00a0 (Typhlosole, Malpighian tubules, Blood glands, Cloaca, Phallic gland, Kidney, Collateral Gland) \nAnswer: \n<\/p>\n Question 9. \nCopy the diagram and label the numbered parts. \n \nAnswer:<\/p>\n \n- Testis<\/li>\n
- Vasa efferentia<\/li>\n
- Fat bodies<\/li>\n
- Urino genital duct<\/li>\n<\/ol>\n
Question 10. \nMatch the following.<\/p>\n \n\n\nColumn A<\/td>\n | Column B<\/td>\n<\/tr>\n | \nHaemocoelom<\/td>\n | Frog<\/td>\n<\/tr>\n | \nTyphlosole<\/td>\n | Frog<\/td>\n<\/tr>\n | \nCloaca<\/td>\n | Earthworm<\/td>\n<\/tr>\n | \nPseudocoelom<\/td>\n | Cockroach<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer:<\/p>\n \n\n\nColumn A<\/td>\n | Column B<\/td>\n<\/tr>\n | \nHaemocoelom<\/td>\n | Cockroach<\/td>\n<\/tr>\n | \nEarthworm<\/td>\n | Earthworm<\/td>\n<\/tr>\n | \nCloaca<\/td>\n | Frog<\/td>\n<\/tr>\n | \nPseudocoelom<\/td>\n | Ascaris<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 11. \nName the labeled parts A, B in the diagram given below \n \nAnswer: \nA. Chondocyte<\/p>\n B. Collagen fibers<\/p>\n Question 12. \nCirculating fluid of cockroach is colourless.<\/p>\n \n- Name the circulating fluid.<\/li>\n
- Name the cell concerned in it.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- hemolymph<\/li>\n
- hemocytes<\/li>\n<\/ol>\n
Question 13. \nMatch the following:<\/p>\n \n\n\nA<\/td>\n | B<\/td>\n<\/tr>\n | \nIntestinal mucosa<\/td>\n | Skeletal muscle<\/td>\n<\/tr>\n | \nBiceps muscle<\/td>\n | Smooth muscle<\/td>\n<\/tr>\n | \nTendon<\/td>\n | Brush bordered columnar epithelium<\/td>\n<\/tr>\n | \nIntestinal muscle<\/td>\n | Connective tissue<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer:<\/p>\n \n\n\nA<\/td>\n | B<\/td>\n<\/tr>\n | \nIntestinal mucosa<\/td>\n | Brush bordered columnar epithelium<\/td>\n<\/tr>\n | \nBiceps muscle<\/td>\n | Skeletal muscle<\/td>\n<\/tr>\n | \nTendon<\/td>\n | Connective tissue<\/td>\n<\/tr>\n | \nIntestinal muscle<\/td>\n | Smooth muscle<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 14. \nGive one word for the following.<\/p>\n \n- Tissue specialised to store fats.<\/li>\n
- Tissue contains fibroblasts, macrophages and mast cells.<\/li>\n
- Tissue attach skeletal muscles to bones.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Adipose tissue<\/li>\n
- Areolar tissue<\/li>\n
- Tendons<\/li>\n<\/ol>\n
Question 15. \nYou are given permanent slides of a bone and cartilage. How will you identify them using a microscope. \nAnswer:<\/p>\n \n- Bone: Presence of Haversian system.
\nPresence of Haversian canal in the centre.<\/li>\n - Cartilage: Matrix contain spaces called lacunae.
\nLacunae contain chondrocyte.<\/li>\n<\/ol>\nQuestion 16. \nFrogs maintain ecological balance. As a biological student do you agree with this statement? Why? \nAnswer: \nFrogs maintain ecological balance because they serve as an important link of food chain and food web in the ecosystem.<\/p>\n Question 17. \nRatheesh mounted the mouthparts of cockroach in the following manner. If there is any error, correct it. \n \nAnswer: \nA) Labium \nB) Labrum \nC) Mandibles \nD) Hypopharynx \nE) Maxilla.<\/p>\n Question 18. \nObserve the diagram given below and label the parts \nA, B, C, D. \n \nAnswer: \nA – Liver \nB – Stomach \nC – Intestine \nD – Rectum<\/p>\n Question 19. \nWhile viewing the fallopian tube through CT scan we can find large number of cilia.<\/p>\n \n- Identify the tissue present in the fallopian tube.<\/li>\n
- Mention the function of cilia.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Ciliated epithelium<\/li>\n
- Ovum is moved by the help of cilia.<\/li>\n<\/ol>\n
Question 20. \n‘An earthworm respires through skin and excretes through nephridia’ Rewrite the above sentence beginning with ‘A cockroach ………………..’ making appropriate \nchanges. \nAnswer: \nA cockroach respires through trachea and excretes through malpighian tubules.<\/p>\n Question 21. \nMatch the following<\/p>\n \n\n\ni<\/td>\n | ii<\/td>\n<\/tr>\n | \nHypopharynx<\/td>\n | Food grinding<\/td>\n<\/tr>\n | \nNephridium<\/td>\n | Food absorption<\/td>\n<\/tr>\n | \nGizzard<\/td>\n | Bone cell<\/td>\n<\/tr>\n | \nTyphlosole<\/td>\n | Phallomere<\/td>\n<\/tr>\n | \nOsteocyte<\/td>\n | Tongue<\/td>\n<\/tr>\n | \nGenitalia<\/td>\n | Earthworm<\/td>\n<\/tr>\n | \n<\/td>\n | Frog<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer:<\/p>\n \n\n\ni<\/td>\n | ii<\/td>\n<\/tr>\n | \nHypopharynx<\/td>\n | Tongue<\/td>\n<\/tr>\n | \nNephridium<\/td>\n | Earthworm<\/td>\n<\/tr>\n | \nGizzard<\/td>\n | Food grinding<\/td>\n<\/tr>\n | \nTyphlosole<\/td>\n | Food absorption<\/td>\n<\/tr>\n | \nOsteocyte<\/td>\n | Bone cell<\/td>\n<\/tr>\n | \nGenitalia<\/td>\n | Phallomere<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 22. \nIdentify the diagram and label the part marked A. \n \nAnswer: \nFrog female reproductive system Part A is Oviduct<\/p>\n Question 23. \nObserve the given diagram. \n<\/p>\n \n- Identify X and Y.<\/li>\n
- Write any two characters of X and Y.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- X – Striated muscle
\nY – Cardiac muscle<\/li>\n - Striated muscle – Skeletal muscle, voluntary muscle, striations present Cardiac muscle – Muscles of heart, branched muscle fibres, intercalated disc.<\/li>\n<\/ol>\n
Question 24. \nObserve the table given below and fill in the blanks from the list given below: \n(Pancreas, Liver, Salivary gland, Tear gland, Adrenal gland, Thyroid gland) \n \nAnswer: \n<\/p>\n Question 25. \nThere are some physiological similarities between typhlosole and villi. Substantiate your answer. \nAnswer: \nBoth typhlosole and villi are part of intestine of earthworm and human beings respectively. Typhlosole and villi increase the effective area of absorption in the intestine.<\/p>\n Question 26. \nObserve the given diagrams. \n \n<\/p>\n \n- Identify A and B.<\/li>\n
- Write any one function of each.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- A – Non-striated muscle (smooth muscle)
\nB – Ciliated epithelium<\/li>\n - A – Found in the wall of internal organs and concerned with the movement of these organs. B – Ciliated epithelium is to move particles or mucus in a specific direction over the epithelium.<\/li>\n<\/ol>\n
Question 27. \nWrite the significance of<\/p>\n \n- Blood<\/li>\n
- Neuroglia<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Blood – The main circulating fluid that help in the transport of various substances.<\/li>\n
- Neuroglia – Protect and support neurons. Neuroglia make up more than one half the volume of neural tissue in our body.<\/li>\n<\/ol>\n
Question 28. \nClassify the given terms into three columns and give appropriate headings. \nStriated, heart muscle, intercalated disc, biceps, visceral organs, no striation. \nAnswer: \n<\/p>\n Question 29. \nWhere do you find the following structures in human body.<\/p>\n \n- Chondrocytes<\/li>\n
- Axon<\/li>\n
- Osteocytes<\/li>\n
- Plasma<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Cartilage<\/li>\n
- Neuron<\/li>\n
- Bone<\/li>\n
- Blood<\/li>\n<\/ol>\n
Question 30. \nWrite a suitable world for 4th<\/sup> place.<\/p>\n\n- Muscle to bone – Tendon; Bone to Bone – _____________<\/li>\n
- Bone – osteocytes; Cartilage – __________<\/li>\n
- Cardiac Muscle – Involuntary; Striated Muscle – __________<\/li>\n
- Contractile cell – Muscle; Excitable cell – ______________<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Ligament<\/li>\n
- Chondrocytes<\/li>\n
- Voluntary<\/li>\n
- Neuron<\/li>\n<\/ol>\n
Question 31. \nGive an account on Nephridia of earthworm. \nAnswer: \nExcretory organs in earthworm is nephridia. There are three types:<\/p>\n 1. Septal nephridia: Present on both the sides of intersegmental septa of segments 5 to the last that open into intestine.<\/p>\n 2. Integumentary nephridia: attached to lining of the body wall of segment 3 to the last that open on the body surface.<\/p>\n 3. Pharyngeal nephridia: present as three paired tufts in the 4th<\/sup>, 5th<\/sup>, and 6th <\/sup>segments.<\/p>\nQuestion 32. \nFlow chart showing flow of food through the alimentary canal of an earthworm given. Correct the flow chart if there is any mistake. \nMouth\u2192Pharynx \u2192 Stomach \u2192 intestine \u2192 Gizzard \u2192 Oesophagus. \nAnswer: \nMouth \u2192 Pharynx \u2192 Oesophagus \u2192 Gizzard \u2192 Stomach \u2192 Intestine<\/p>\n Question 33. \nMatch the following.<\/p>\n \n\n\nBidder\u2019s canal<\/td>\n | Cockroach<\/td>\n<\/tr>\n | \nLabium<\/td>\n | Earthworm<\/td>\n<\/tr>\n | \nTyphlosole<\/td>\n | Frog<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer:<\/p>\n \n\n\nBidder\u2019s canal<\/td>\n | Frog<\/td>\n<\/tr>\n | \nLabium<\/td>\n | Cockroach<\/td>\n<\/tr>\n | \nTyphlosole<\/td>\n | Earthworm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 34. \nYou are given an earthworm for dissection, how will you identify its anterior, posterior, dorsal and ventral sides. \nAnswer: \nThe dorsal surface of the body is marked by a dark median mid dorsal line along the longitudinal axis of the body. The ventral surface is distinguished by the presence of genital openings. Anterior end consists of the mouth and the prostomium. The posterior end is slightly rounded.<\/p>\n Question 35. \nBlood cell of earthworm lack hemoglobin. But blood of earthworm is red in colour. How do you account for it? \nAnswer: \nBlood cell of earth worm lack hemoglobin. But blood of earthworm is red in colour because hemoglobin is dissolved in blood plasma.<\/p>\n Question 36. \nMatch the related items from B and C with Column A. \n \nAnswer: \n<\/p>\n Question 37. \nCopy and complete the animals on the table and the excretory organs.<\/p>\n \n\n\nAnimals<\/td>\n | Excretory organs<\/td>\n<\/tr>\n | \nEarthworm<\/td>\n | _______________<\/td>\n<\/tr>\n | \n________________<\/td>\n | Malpighian tubules<\/td>\n<\/tr>\n | \nFrog<\/td>\n | ________________<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer:<\/p>\n \n\n\nAnimals<\/td>\n | Excretory organs<\/td>\n<\/tr>\n | \nEarthworm<\/td>\n | Nephridia<\/td>\n<\/tr>\n | \nCoackroach<\/td>\n | Malpighian tubules<\/td>\n<\/tr>\n | \nFrog<\/td>\n | Kidney<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 38. \nIdentify the animals from the hints given below.<\/p>\n \n- Invertebrate, Burrowing in moist soil, Nephridia, Genital pore.<\/li>\n
- Chordata, Amphibian, Kidney, Cloaca<\/li>\n
- Invertebrate, Insecta, Malpighian tubules, gonapophysis.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Earthworm<\/li>\n
- Frog<\/li>\n
- Cockroach<\/li>\n<\/ol>\n
Question 39. \nIdentify the statements as True or False.<\/p>\n \n- First segment of earthworm is Prostomium.<\/li>\n
- Peristomium contain mouth.<\/li>\n
- Clitellum is on segments 14-16.<\/li>\n
- Earthworm has only a single female genital aperture.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- False (First segment is peristomium)<\/li>\n
- True<\/li>\n
- True<\/li>\n
- Tare<\/li>\n<\/ol>\n
Question 40. \nEarthworm feeds on humus, which contain large amount of humic acid.<\/p>\n \n- How does the earthworm neutralises the humic acid?<\/li>\n
- Name the region of alimentary canal where humic acid is neutralised.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Calciferous gland, present in the stomach, neutralise the humic and present in humus.<\/li>\n
- In stomach.<\/li>\n<\/ol>\n
Question 41. \nWrite a note on typhlosole. \nAnswer: \nThe special structure present in the intestine of earthworm between 26-35 segment is called typhlosole. It is an internal median fold of dorsal wall of intestine. Typhlosole increases the effective area of absorption in the intestine.<\/p>\n Question 42. \nBlood glands are important in earthworm. Give reason. \nAnswer: \nBlood glands are present on the 4th<\/sup>, 5th<\/sup> and 6th<\/sup> segments of earthworm. They produce blood cells and hemoglobin which is dissolved in blood plasma.<\/p>\nQuestion 43. \nEarthworm is a hermaphrodite animal. Where are its sex organs situated? \nAnswer: \nTwo pairs of testes present in the 10th<\/sup> and 11th<\/sup> segments. One pair of ovaries is attached at the inter-segmental septum of the 12th<\/sup> and 13th<\/sup> segment.<\/p>\nQuestion 44. \nEarthworms are known as \u2018Friends of farmers\u2019. Give reason. \nAnswer: \nEarthworms are known as \u2018friends of farmers\u2019 because they make burrows in the soil and make it porous which helps in respiration and penetration of the developing plant roots. The process of increasing fertility of soil by the earthworm is called vermicomposting. They are also used as bait in the game fishing.<\/p>\n Question 45. \nWrite the missing word in 4th<\/sup> place.<\/p>\n\n- Dorsally – Tergites; Ventrally – ……………<\/li>\n
- Earthworm – Nephridia; Cockroach – …………….<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Stern items<\/li>\n
- Malpighian tubules<\/li>\n<\/ol>\n
Question 46. \nCockroach show sexual dimorphism. Write any two morphological differences between male and female cockroaches. \nAnswer:<\/p>\n \n- In females, the 7th<\/sup> sternum is boat-shaped and there is presence of a brood pouch.<\/li>\n
- In males, there is presence of anal style and genital pore in the 9th<\/sup> segment.<\/li>\n<\/ol>\n
Question 47 \nWhile dissecting a cockroach to display its digestive system, a student observed certain thick white tubules. Teacher explained it as part of respiratory system.<\/p>\n \n- Name the tubules.<\/li>\n
- Draw a flow chart showing the flow of air through this system.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Tracheal tubules<\/li>\n
- Spiracle \u2192 Trachea \u2192 Tracheoles \u2192 Tissue<\/li>\n<\/ol>\n
Question 48.<\/p>\n \n- Identify the diagram given below.<\/li>\n
- Label the parts a to e.<\/li>\n<\/ol>\n
\nanswer:<\/p>\n
\n- Digestive system of cockroach<\/li>\n
- parts from a to e\n
\n- a – Oesophagus<\/li>\n
- b – Crop<\/li>\n
- c – Hepatic caeca<\/li>\n
- d – Mesentrorr<\/li>\n
- e – Malpighian tubules<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
Question 49. \nBlood of cockroach is colourless. Give reason. \nAnswer: \nBlood of cockroach is composed of colourless plasma and hemocytes. No respiratory pigments present in the blood of cockroach. So blood is colourless.<\/p>\n Question 50. \nCockroach is uricotelic animal. Give reason. \nAnswer: \nCockroach excrete nitrogenous waste in the form of uric acid. So cockroach is known as uricotelic animal.<\/p>\n Question 51. \nName the four structure helps in excretion in cockroaches. \nAnswer:<\/p>\n \n- Malpighian tubule<\/li>\n
- fat body<\/li>\n
- nephrocytes<\/li>\n
- urecose gland.<\/li>\n<\/ol>\n
Question 52. \nIf the head of cockroach is cut off, it will still alive for as long as one week. Give reason. \nAnswer: \nThe head of cockroach holds a bit of a nervous system while the rest is situated along the ventral part of its body. So, if the head of cockroach is cut off it will still live for long as one week.<\/p>\n Question 53. \nName the sensory organs of cockroaches. \nAnswer: \nAntennae, Compound eyes, anal cerci, maxillary palps, Labial palps.<\/p>\n Question 54. \nCompound eyes are more effective than vertebrate eye. Give reason. \nAnswer: \nEach compound eyes in cockroach consists of about 200 ommatidia. With the help of several ommatidia, a cockroach can receive several images of an object. This kind of vision is known as mosaic vision. Compound eye is more effective than vertebrate eye because it can detect the movement of other animals more easily and efficiently.<\/p>\n Question 55. \nFrog show sexual dimorphism. Write the morphological difference present only in male frog. \nAnswer:<\/p>\n \n- Presence of vocal sacs<\/li>\n
- Presence of copulatory pad on the 1st<\/sup> digit of the forelimb.<\/li>\n<\/ol>\n
Question 56. \nPrepare a flow chart showing the flow of food in the alimentary canal of frog. Compare it with alimentary canal of cockroach. \nAnswer: \n1. In frog: \nMouth \u2192 oesophagus \u2192 stomach \u2192 Intestine \u2192 Rectus \u2192 Cloacal aperture<\/p>\n 2. In coackroach: \nMouth \u2192 Oesophagus \u2192 Crop \u2192 Gizzard \u2192 Mesentron \u2192 ileum \u2192 Colon \u2192 Rectum \u2192 Anus<\/p>\n Question 57. \nCloaca is a common opening of 3 tubes or tracts.<\/p>\n \n- Name the tracts which opens to cloaca.<\/li>\n
- Name the animal which possess cloaca.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Tracts which opens to cloaca\n
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