Which one of the following is heterosporous?
Options
(a) Dryopteris (b) Salvinia (c) Adiantum (d) Equisetum
Correct Answer:
Salvinia
Explanation:
Salvinia is an aquatic fern with both annual and perennial species- b is heterosporous […]
The common nitrogen fixer in paddy fields is
Options
(a) Rhizobium (b) Azospirillum (c) Oscillatoria (d) Frankia
Correct Answer:
Azospirillum
Explanation:
No explanation available. Be the first to write the explanation for this question […]
In gymnosperms, the pollen chamber represents
Options
(a) a cavity in the ovule in which pollen grains are stored after pollination (b) an opening in the megagametophyte through which the pollen tube approaches the […]
Darwinism finches are an excellent example of
Options
(a) adaptive radiation (b) seasonal migration (c) brood parasitism (d) connecting links
Correct Answer:
adaptive radiation
Explanation:
Darwin’s Finches are an excellent example of adaptive […]
Companion cells are closely associated with :
Options
(a) Sieve elements (b) Vessel elements (c) Trichomes (d) Guard cells
Correct Answer:
Sieve elements
Explanation:
Companion cells are narrow, elongated and thin walled living […]
Vasa effferentia are the ductules leading from
Options
(a) testicular loubles to rete testis (b) rete testis to vas deferens (c) vas deferens to epididymis (d) epididymis to urethra
Correct Answer:
rete testis […]
Gentic variation in a population arises due to
Options
(a) Mutations only (b) Recombination only (c) Mutations as well as recombination (d) Reproductive isolation and selection
Correct Answer:
Mutations as well as recombination
Animal vectors are required for pollination in
Options
(a) Maize (b) Vallisneria (c) Mulberry (d) Cucumber
Correct Answer:
Cucumber
Explanation:
There are different types of vectors involved in pollination. For example, Maize, mulberry […]
Peptide synthesis inside a cell takes place in:
Options
(a) chloroplast (b) mitochondria (c) chromoplast (d) ribosomes
Correct Answer:
ribosomes
Explanation:
Peptide synthesis takes place in ribosome inside a cell.
Nucellar polyembryony is reported in species of
Options
(a) Citrus (b) Gossypium (c) Triticum (d) Brassica
Correct Answer:
Citrus
Explanation:
Polyembryony is a type of seed formation in which the nucellar cells that are […]
2017 Copyright Doctor Dreams Training Academy