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Preeti Dabral 3 years, 2 months ago
Tissue is a group of related cells that have a common origin and perform a common function.
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Preeti Dabral 3 years, 2 months ago
Amoeba feeds on microorganisms (like planktons) which float on water. It develops false feet or pseudopodia to surround the food finally captures the food within a sac-like structure called the food vacuole inside which digestion of food takes place.
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Preeti Dabral 3 years, 2 months ago
Energy to be given to 1 C of charge to pass through 1 V potential difference = 1 J.
Energy to be given to 1C of charge to pass through 6 V battery = 6 J
or Ω = VQ = 6 volt ×1 coulomb = 6{tex}\frac JC\times\;1C=6\;J{/tex}
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Preeti Dabral 3 years, 2 months ago
Terrestrial organisms take up oxygen from the atmosphere whereas aquatic animals obtain oxygen from water. Air contains more O2 as compared to water. Since the content of O2 in air is high, the terrestrial animals do not have to breathe faster to get more oxygen. Therefore, unlike aquatic animals, terrestrial animals do not need adaptations for gaseous exchange.
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Preeti Dabral 3 years, 2 months ago
Contraceptive methods are mainly used for the following reasons: to prevent unwanted pregnancies. To control population growth or fertility. To prevent the transmission of sexually transmitted diseases.
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Preeti Dabral 3 years, 2 months ago
The human male reproductive system consists of:
- Testes - Are the primary reproductive organs in males which are in pair. These are oval shaped organs which lie outside the abdominal cavity. It makes the male *** cells called sperms and produces male *** hormones called testosterone. The testes are situated in the scrotal sac outside the main body cavity because the formation of sperms requires a lower temperature than the normal body temperature.
- ******* - Is a muscular pouch which houses the testes. It is present outside the abdominal cavity and maintains a lower temperature than the normal body temperature.
- Epididymis - The sperms formed in the testes goes into a coiled tube called epididymis which stores the sperms temporarily.
- Vas Deferens (sperm duct) - It is a long tube which carries the sperms from epididymis to another tube called urethra.
- Seminal vesicles and prostrate gland - Both these glands are present along the path of vas deferens and add their secretions to sperms which allows them to transport easily.
- ***** - It is an organ which passés the sperms from the man's body into the ****** in the women's body during mating.
The secretions of seminal vesicles and prostrate gland provide nutrition to the sperms and also make their transportation easier by secreting a thick liquid.
- A pair of Ovaries
- One on each side of uterus
- Produce female *** cell (ovum/ova)
- Secrete female hormones estrogen & progesterone
- Fallopian tube
- Exist in pairs , originating from uterus extending up to each ovary
- Receives ovum from ovary
- Uterus
- Pear-shaped muscular hollow structure
- Foetus develops here
- Cervix
- Narrow lower part of uterus
- ******
- Tube like structure
- Sperm discharge occurs here
- Acts as birth canal
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Preeti Dabral 3 years, 2 months ago
When we touch a hot object the sense organs feel the temperature and the hand is withdrawn. The stimulus is carried to the brain by the sensory neuron while it is carried back to effector organs by motor neurons.
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Preeti Dabral 3 years, 2 months ago
| Fragmentation | Regeneration |
| Organisms that are fragmented result in each fragment growing into an individual organism | Regeneration occurs when an organism only regrows a lost limb or any other part of the body. |
| A new individual emerges from each fragment | No new organisms are formed |
| Only a few organisms can fragment and form new individuals | All organisms exhibit the ability to regenerate (Only to some degree) |
| Fragmentation is observed in organisms such as flatworms and sponges | Examples of regeneration include regrowing a lost limb, such as the tail of a lizard. (Please note: Most lizards can lose their tails and then have them grow back. But if they lose their forelimb or hindlimb, it will not regrow) |
Rohit Kumar 3 years, 2 months ago
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