9th Standard Syllabus & Materials
9th Standard
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Published on: 04/10/2019
Term 1 Living World of Animals - Diversity in Living Organism - Kingdom Animalia
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
List the integumentary glands of mammals.
2.
How are the limbs of the birds adapted for avian life?
3.
On the basis of Position of notochord, classify the different Prochordates. Justify your answer.
4.
How is the reproductive characters of mammals different from those of Aves?
5.
Comment on the aquatic and terrestrial habits of amphibians.
6.
List five characteristic features of fishes.
7.
Differentiate between flat worms and round worms?
8.
How is the body wall of coelenterates arranged?
9.
List the excretory organs of invertebrates in relation to their habitats.
10.
Give an account on phylum Annelida.
1.
The integumentary glands of mammals are
Sweat, sebaceous, scent glands and mammary glands. Mammary glands are the modified integumentary glands.
2.
i) Forelimbs of birds are modified into wings with feathers for flight.
ii) The hind limbs are adapted for walking perching or swimming.
3.
On the basis of position of notochord, the different prochordates are classified as follows.
1. Sub-phylum Hemichordata : The notochord is persistant as the stomochord in the anterior region of the animal. e.g., Balanoglossus.
2. Sub-phylum - Cephalochordata : The persistent notochord extends forward beyond the brain. e.g., Amphioxus.
3. Sub-phylum - Urochordata : The notochord is confined to the tail region of the larva, e.g., Asicidian.
4.
Reproductive characters of mammals differ from those of Aves by
1. The presence of mammary glands.
2. Testes lie outside the body cavity enclosed in scrotal sacs.
3. Alecithal eggs.
4. Fertilization is always internal.
5. They give birth to young ones and feed their youngones with milk.
6. Placenta is a characteristic feature of mammals.
5.
Aquatic habits of amphibians:
1. The larva of amphibians (tadpole) lives in water and breathes with gills.
2. External fertilization occurs in frog with water as a medium of fertilization.
3. The adult frog has webbed feet to swim in water
4. The skin is moist and glandular which helps in Respiration.
Terrestial habits of amphibians:
1. The adult live on land and breathe through lungs. Bucco-Pharynx also helps in respiration.
2. The fore limbs are short and help to hop on land.
6.
1. Fishes are poikilothermic, aquatic vertebrate with jaw.
2. Body is streamlined and differentiated into head, trunk, and tail.
3. Locomotion is by paired and median fins.
4. Body has covering of scales.
5. Respiration is performed by gills. Gill slits are 5-7 pairs.
7.
| S.No | Flat worms | Round worms |
| 1. | It is phylum platyhelminthes. | It is phylum Aschelminthes |
| 2. | The alimentary canel is either absent or very simple |
The alimentary canal is straight tube. |
| 3. | Having both male and female reproductive organ in a single individual. |
Sexes are separate individual. |
8.
The body wall is of two layers of cells namely the outer ectoderm and the inner endoderm, which is separated from each other by a non-cellular jelly-like substance called mesoglea.
9.
| Phylum | Excretory organ | Habitat | Function |
| 1. Protozoa | General Body surface and contractile vacuole | aquatic | Eliminates waste products. |
| 2. Porifera | General Body Surface | aquatic | Eliminates waste products. |
| 3. Coelenterata | General Body Surface | aquatic-marine | Eliminates waste products. |
| 4. Platyhelminthes | Flame cells | Parasitic | Excretion and Osmoregulation |
| 5. Aschelminthes | Renette cells/Excretory tube | Free living soil nematodes (or) | Excretion |
| 6. Annelida | Nephridia and Chloragogen cells. | Aquatic and terrestrial forms. | Excretes waste |
| 7. Arthropoda | Malpighian tubules Green gland | Aquatic and terrestrial forms. | Excretes waste |
| 8. Mollusca | Organ of Bojanus | Both marine and fresh water | Excretion |
| 9. Echinoderm | Amoebocyte | Aquatic | Excretion |
10.
This animals are characterized by the possession of a body cavity called coelom. Some animals of annelids have movable bristles called setae it is used to locomotion. Nephridia is the excretory structures and help to remove metabolic waste. They have central nervous system with a brain.
9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
