STD 12 - 3. reproductive health — BIOLOGY STD 12 Science — Question

$(a)$ The cattle egret and grazing cattle

$(b)$ Barnacle balanus and Barnacle chathamalus

$(c)$ Goat and Abingdon turtle from Galapagosisland

$(d)$ Barnacles growing on the back of whale

$(1)$ The process of fusion of a sperm with an ovum is called fertilisation

$(2)$ $LH$ surge induces rupture of graffian follicle

$(3)$ $8$ cells embryo is called morula

$(4)$ Length of fallopian tube is $8-10 \,cm$

$(1)$ Zooplanktons are primary producers in an aquatic ecosystem.

$(2)$ Decomposition is largely an oxygen requiring process.

$(3)$ In a natural ecosystem, fishes, wolf, etc. are carnivore.

$(4)$ The amount of energy decreases in each successive trophic level.