MCQ
About how long ago was the earth formed
- ✓$4.5$ billion years ago
- B$10$ billion years ago
- C$3.0$ billion years ago
- D$20$ billion years ago
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$I.$ In the centre of each I-band is an elastic fibre ($Z-$line) which bisects it
$II.$ Thin filament are firmly attached to the $Z-$line
$III.\;M-$line is a fibrous membrane in the middle of $A-$band
$IV.$ A sarcomere comprises one full$-A $ band and two half $I-$bands
| Row | $I$ | $II$ | $III$ |
| $A$ | digestive | hormones | circulatory |
| $B$ | endocrine | enzymes | lymphatic |
| $C$ | endocrine | hormones | circulatory |
| $D$ | digestive | enzymes | lymphatic |
| List-I | List-II |
| (a) Adhering junctions | (i) Establish a barrier that prevents leakage of extracellular fluid across a layer of cells |
| (b) Tight junctions | (ii) Functions like rivets and fasten cells together into strong sheets |
| (c) Gap junctions | (iii) Pass information through neurotransmitters from one cell to another |
| (d) Synaptic junctions | (iv) Provide cytoplasmic channels from one cell to an adjacent cell for communication |
