Which one is a wrong statement about sieve tubes?
i) They are found in pteridophytes and gymnosperms.
ii) They have companion cells.
iii) Sieve areas do not form sieve plates.
iv) Sieve areas are not well differentiated.
v) They consist of vertical cells placed one above the other forming long tubes connected at the end walls by sieve pores.
Match the following and choose the correct answer.
a) S Cycle | i) Nuclear fallout |
b) Oxygen tank | ii) National Park |
c) Torrey canyon | iii) Thunder dragon |
d) Sr 90 | iv) Beggiatoa |
v) Oil spillage |
Deficiency symptoms and associated minerals are given below. Select the right match.
Interveinal chlorosis of leaves, first in younger leaves | Mg |
Interveinal chlorotic and necrotic spots on leaves | Fe |
Bronzing of the leaves | Mn |
Interveinal chlorosis of leaves, first in older leaves | CI |
Inverted ecological pyramids are found in:
(i) Pyramid of number in a forest ecosystem.
(ii) Pyramid of biomass in a sea.
(iii) Pyramid of biomass in a grass land ecosystem.
(iv) Pyramid of biomass in a pond. ecosystem.
(v) Pyramid of number in a parasitic food chain.