Question

47. Sieve tubes differ from sieve cells because
they:
(a) Have sieve pores mainly at end walls
(b) Are shorter
(c) Lack nuclei
(d) Are dead​

Answer 1

$\rule{200}{2}$$\huge\boxed{\boxed{\underline{\mathcal{\red{A}\green{N}\pink{S}\orange{W}\blue{E}\pink{R:-}}}}}$

b) are shorter.

Answer 2

B is your answer ok