P-2 Animal Classification — Science STD 10 — Question

What are the methods used by plants to get rid of their waste products?

the role of anomalous behaviour of water in preserving aquatic life in regions of cold climate?

Prepare a concept map for the solar thermal power station

A filamentous alga X is found in ponds, lakes and slow-moving streams. The filament of this alga simply breaks into two (or more) pieces on maturing and each piece then grows to become a complete new alga.

1. Name an alga which X is likely to be.
2. What is the colour of X?
3. What is the method of forming new algae by the breaking of parent alga known as?
4. An Amoeba also breaks up to form two daughter Amoebae. What is the difference in the splitting of Amoeba and splitting of this alga as a method of reproduction?
5. Name one marine animal which reproduces in the same way as alga X.

The top part A of the flask-shaped reproductive organ X in the flower of a plant secrets a surgery substance into its lower part B which goes towards the bottom part C of the flask-shaped organ. When a tiny grain D coming from the top part E of another reproductive organ Y i the flower falls on part A, it grows a long tube F through the organ X i response to the sugary substance and reaches the bottom part C of flask-shaped organ to carry out fertilisation.

1. Name parts (i) organ X, and (ii) organ Y, inside the flower?
2. Name parts (i) A (ii) B, and (iii) C, of flask-shaped organ.
3. Name (i) grain D, and (ii) part E of organ Y.
4. Name the tube F.
5. What is the phenomenon of growing a long tube in response to sugary substance in the process of fertilisation in a flower known as?

Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved.

Write on significant space missions carried out by man.

P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.

1. What is P? Name five organs which contain cells (or group of cells) like P.
2. Name the nerves Q.
3. What is R? Give two examples of R.
4. Name nerves S.
5. How do messages travel through the nerves Q and S?

Write short note: Notochord.

Assign names in the figure given below. Explain the various stages those are kept blank: