(a) Pyramid of Number
This is spindle shaped pyramid.
All these approaches help to conserve species and population diversity outside the natural habitats.
In-situ | Ex-situ |
1. It is the most appropriate
method to maintain species of
wild animals and plants in their
natural habitat.
|
1. In this approach, threatened
animals and plants are not
preserved in their natural
habitat and placed in special
setting, where they can be
protected and special care.
|
2. No such technique can be used
for In-situ conservation.
|
2. Gametes of threatened species
can be preserved in viable and
fertile condition for long periods
using cryopreservation
techniques.
|
3. In this method organism
alongwith its entire habitat is
preserved. Chances of
fertilization and propagation
are higher.
|
3. Reproduction in captivity often
slows down and may not give
desired results.
|
4. Eg. National Park, Wild Life
Sancturies.
|
4. Eg. Seed banks. |
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________.