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A barrel shaped structure organized by r...

A barrel shaped structure organized by remaining spindle fibres at the interzonal region is called

A

leucoplast

B

chromoplast

C

Phragmoplast

D

amyloplast

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Paragraph based question Read the following paragraphs and answer the questions based on it. After the death of apex consumers, their energy becomes available to the decomposers. Fungi and other micro-organisms decompose the bodies of dead animals. They are called decomposers. In the process of obtaining food from the remains of organisms, decomposers convert them into simple carbon compounds. These substances easily mix with air, water and soil from where they are again absorbed by plants and incorporated into the food chain. How is energy supplied to decomposers?

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Read the paragraph and answer the following questions: I am a penguin. l Iive in polar region covered by snow. My abdomen is white. My skin is thick with a layer of fat underneath. My body is spindle shaped. My wings are small. My toes are webbed. We live in flocks. Why is my skin white and thick and why is there a thick layer of fat underneath?

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Read the paragraph and answer the questions given below : Locomotion is considered as an important characteristics of the animals. However, animals belonging to Porifera are said to be sedentary. Every other phylum has typical locomotory organs. E.g. Nereis crawls with the help of parapodia, whereas earthworm buries in soil by setae. Spiders have four pairs of walking legs, crab has five while all insects have three pairs of walking legs. The walking legs are also called appendages. Starfish moves with the help of tube feet. Snails and bivalves use muscular foot for locomotion. Birds flying with their spread out wings and fish swimming with their fins, both have spindle-shaped body tapering at both the ends. While flying or swimming such body offers least resistance during locomotion. Mammals have two pairs of limbs while animals like snakes are limbless. Other animals belonging to the class of snakes also have very weak limbs.which make them creep on the ground. Answer the question: What are the locomotory organs in phylum Annelida?

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NIKITA PUBLICATION -CELL DIVISION-EXERCISE
  1. Division of cytoplasm i.e. cytokinesis name proposed by

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  2. During cytokinesis, cell plate is formed from

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  3. A barrel shaped structure organized by remaining spindle fibres at the...

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  4. The form of cell plate that represents middle lamella formed from phra...

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  5. The cell plate grows in ... manner in cytokinesis of plant cell

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  6. In animal cell cytokinesis takes place by ....& cytokinesis of animal ...

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  7. In some organisms karyokinesis is not followed by cytokinesis as a re...

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  8. Cell division of vegetative cell or somatic cell is ……….type

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  9. The cell division helpful in the reproduction of unicellular organisms

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  10. How many generations time of mitotic divisions occur in a cell of root...

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  11. How many mitotic divisions occur in a cell of the root tip to form 256...

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  12. Which cell division is responsible for growth, repair and maintenance.

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  13. In mitosis newly formed cells are

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  14. The term meiosis was coined by

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  15. Read the statements (A) Meiosis is a special kind of cell division whi...

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  16. The cells in which meiosis occurs are called

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  17. As the chromosome number is reduced to the half of its original number...

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  18. In meiosis newly formed cells are

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  19. Why new daughter cells produced by meiosis are genetically dissimilar?

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  20. Meiosis never takes place in

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