P-1 Carbon Compounds — Science STD 10 — Question

Differentiate between myopia and hypermetropia. What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How does it help?

How is nuclear fission reaction carried out in nuclear power plants?

Answer the following questions by observing the diagram of menstrual cycle:

i. What is the period of menstruation?
ii. On which day does ovulation occur during menstrual cycle?
iii. In menstrual cycle which reproductive organs undergo changes?
iv. Which period is said to be period of regeneration of endometrium?
v. Which period is said to be period of secretions of glands in endometrium?

Give the various functions of brain.

1. Write a food chain comprising all the given organisms?
2. Which organisms in the food chain are (i) herbivore, and (ii) carnivores?
3. Which organisms are (i) predators, and (ii) prey?
4. Which organisms can trap solar energy to make food?
5. Which organism is a secondary consumer?

Write a short note.
Dew point temperature

Two tungsten bulbs of wattage 100 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?

Reproduction is the process by which the living species continues its existence. Lower organisms carry out asexual reproduction while higher plants and animals always show sexual reproduction. Plants reproduce asexually by methods such as fragmentation, vegetative propagation, budding, spore formation. For sexual reproduction they form gametes. In animal kingdom, budding, fission of different types and parthenogenesis are some of the methods that do not require both the sexes. Though regeneration also forms new individual, it is not considered to be a reproductive process because, basically it is a repair process. The ability to regenerate is lost in higher phyla. In human beings | it is restricted only to wound healing. Sexual reproduction is also undergoing lots of experimentation such as cloning which may make females capable of producing their own baby without intervention of any male.
Questions and Answers:
(1) How do living species continue their existence?
(2) Which are asexual methods of reproduction in kingdom Animalia?
(3) Why is regeneration not true method of reproduction?
(4) What are methods of reproduction in plants?
(5) What is the modern method of reproduction aimed at in higher organisms?

Define hydrotropism. Give one example of hydrotropism. State whether this example is of positive hydrotropism or negative hydrotropism. Illustrate your answer with the help of labelled diagram.