35%
16%
46%
23%
Correct answer is C
No of Imperata spp = 23
Total plant species = 50
Percentage of imperata spp = \(\frac{23}{50} * 100℅\)
= 46℅
II and III
I and III
I and IV
I and II
Correct answer is B
Low mortality rate, high birth rate, high immigration rate and low emigration rate are causes for rapid overcrowding.
A freshwater plant such as water lily can solve the problem of buoyancy by the possession of
aerenchyma tissues
dissected leaves
thin cell walls of the epidermis
water-repelling epidermis
Correct answer is A
Aerenchyma is found in hydrophytes like water lily.
This tissue encloses air and provides buoyancy to the plant parts.
The appendicular skeleton is composed of the pectoral girdle
pelvic girdle, fore and hind limbs
pelvic girdle and fore limbs
lumbar vertebrae and pelvic girdle
lumbar vertebrae, fore and hind limbs
Correct answer is A
The appendicular skeleton includes the bones of the shoulder girdle, the upper limbs, the pelvic girdle, and the lower limbs.
Which of the following is a measure for the control of bilharzia?
Cutting low bushes around homes
Application of molluscicides in water bodies
Screening windows and doors with mosquito nets
Application of herbicides in water bodies
Correct answer is B
Schistosomiasis, also known as bilharzia or 'snail fever', is a disease caused by parasites (worms called schistosomes) carried by freshwater snails.
Schistosomiasis control focuses on reducing disease through periodic, large-scale population treatment with medication;
a more comprehensive approach including potable water, adequate sanitation, and snail control would also reduce transmission.