An invasive weed found in standing water is
C. Aquarium oxygen plant
D. Water hyacinth
In vegetative propagation, when the _____ come in contact with damp soil or water, they produce roots and new plants.
C. Axial shoot
Which among the following is immortal
A. Sea algae
C. Plants grown by vegetative propagation
D. Every living organism is mortal
The females of placental mammals exhibit cyclical changes in the activities of ovaries and accessory ducts as well as hormones during the reproductive phase. In non-primate mammals it is known as
A. Oestrus cycle
B. Menstrual cycle
C. Reproductive cycle
D. Sexual cycle
There are various types of reproduction. The type of reproduction adopted by an organism depends on:
A.The habitat and morphology of the organism
B.Morphology of the organism
C.Morphology and physiology of the organism
D.The organism’s habitat, physiology and genetic makeup
There is no natural death in single celled organisms like Amoeba and bacteria because:
A.They cannot reproduce sexually
B.They reproduce by binary fission
C.Parental body is distributed among the offspring
D.They are microscopic
Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because:
A.Sexual reproduction is a lengthy process
B.Gametes of parents have qualitatively different genetic composition
C.Genetic material comes from parents of two different species
D.Greater amount of DNA is involved in sexual reproduction.
Non-flagellate spores are called conidia. In which organism they are seen?
Development of zygote taking place outside the bodyis called?
Parthenogenesis is the development of an organism directly from: