- AHemogin
- BHemocyanin
- CHaemoglobin
- ✓Respiratory pigment is absent
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Assertion $(A)$:
Osteoporosis is characterised by decreased bone mass and increased chances of fractures.
Reason $(R)$ :
Common cause of osteoporosis is increased levels of estrogen.
In the light of the above statements, choose the most appropriate answer from the options given below:
| $(a)$ Pila | $(i)$ Flame cells |
| $(b)$ Bombyx | $(ii)$ Comb plates |
| $(c)$ Pleurobrachla | $(iii)$ Radula |
| $(d)$ Taenla | $(iv)$ Malpighlan tubules |
Select the correct option from the following
$(a) \quad (b)\quad (c)\quad (d)$

$(i)$ The endomembrane system includes plasma membrane, ER, Golgi complex, lysosomes and vacuoles.
$(ii)$ ER helps in the transport of substances, synthesis of proteins, lipoproteins and glycogen.
$(iii)$ Ribosomes are involved in protein synthesis.
$(iv)$ Mitochondria help in oxidative phosphorylation and generation of $ATP$.