Chemical Reactions and Equations — Science STD 10 — Question

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?

Write Short note: Budding in hydra.

Describe the exchange of gases which takes place in the leaves of a plant:

1. During daytime.
2. At night.

Write short note: Germinal layers.

How can bio-diversity be conserved?

What is radioactive pollution? What are its effects?

A worm X found in freshwater and slow-moving streams has been accidently cut into three pieces. It was observed that in due course of time, each cut piece of the worm develops to become a complete worm by growing all the missing parts.

1. Name the worm X which can exhibit this phenomenon of making complete worm from its cut body parts.
2. Name another organism Y which possesses the same characteristic of growing fully from its cut body parts.
3. What is the name of this process in which a complete organism is formed from its cut body part.
4. State whether X and Y are unicellular and/or multicellular organisms.
5. Can a dog be produced completely form its cut body part (say, a cut tail) just like organisms X and Y? Why?

Which projects will you run in relation to environmental conservatioh? How?
(OR)
Write six strategies implemented by you for conservation of the environment.

When an insect sits on the flower of a plant then some particles A present in the top of little stalks in the flower attach to its body hair. When this insect now sits on the flower of another similar plant, then particles A attached to the hair of insect are put on the top of a flask-shaped organ at the centre of flower. The particle A grows a long tube b from the top of flask-shaped organ through which C moves down and reaches the bottom part of flask-shaped organ. Here C fuses with the nucleus of d contained in structure E. the fusion of C and D forms a new cell f which grows and develops into a seed of the plant.

1. What are particles A? What is the process of transferring A from one flower to another flower of similar plant by the insect known as?
2. What is the name of tube B?
3. What is C which moves down through the tube B?
4. Name D and E.
5. What is F?