The most primitive cell like chemical aggregates capable of growth and division were
chemoautotrophs
eobionts
prokaryotes
microspheres
D.
microspheres
Microspheres are the most primitive cell like chemical aggregates. They resemble coccoid bacteria. These are molecular aggregates of proteinoids and capable of growth and division (binary fission or by budding).
Match the following and choose the correct combination from the options given
| Column I | Column II |
| A. Yeast | 1. Reproductive by true regenration |
| B. Planaria | 2. Reproduce by budding |
| C. Mules | 3. Multiply by fragmentation |
| D. Protonema | 4. Do not reproduce |
A - 1; B - 2; C - 3; D - 4
A - 4; B - 3; C - 1; D - 4
A - 4; B - 1; C - 2; D - 3
A - 2; B - 1; C - 4; D - 3
A - 2; B - 1; C - 4; D - 3
Oogamous type of reproduction is seen in
(i) Fucus
(ii) Anabaena
(iii) Nostoc
(iv) Volvox
(i) only
(i) and (ii) only
(i) and (iii) only
(iii) only
(iii) only
In prokaryotes, genetic recombination can occur during
transduction
transformation
conjugation
all of these
Which of the following organisms breeds only once in lifetime?
Bamboo
Oysters
Pelagic fishes
Birds
Birds
In rabbit, head of epididymis present at the head of the testis is called
vas deferens
cauda epididymis
gubernaculum
caput epididymis
Assertion : In bacteria, photosynthesis occurs by utilizing wavelengths longer than 700 nm.
Reason : Here the reaction centre is B-890.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both the assertion and reason are false.
