Tissues — Science STD 9 — Question

Which of the following is gaseous fumigant?

Phloem in the plant perform the function of _________.

1. Conduction of food.
2. Conduction of water.
3. Providing support.
4. Photosynthesis.

Respiration in arthropods occurs through:

1. Gills.
2. Booklungs.
3. Trachea.
4. All of the above.

Is the commonest carrier of pathogens:

1. Mosquito.
2. Housefly.
3. Helminth.
4. None of these.

Which of the following type of irrigation system is used in areas closer to rivers?

Swollen feets and ankle can be naturally cured by dipping them in salt water. Suggest the mechanism involved in this treatment.

Which of the following classes has largest number of animals?

1. Mammals.
2. Pisces.
3. Insect.
4. Reptilian.

The shorter duration crops help the farmer :

Nucleolus is a seat of:

1. Protein synthesis.
2. Ribosome synthesis.
3. Enzyme synthesis.
4. mRNA synthesis.

Which of the following are exotic breeds?
(i) Brawn.
(ii) Jersey.
(iii) Brown Swiss.
(iv) Jersey Swiss.