One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?
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Solution
Short day plants require long uninterrupted dark period for flowering. They will not produce flower if night was interrupted by flash of light.
Which of the following statements regarding mitochondrial membrane is not correct ?
The name of drug used in cancer treatment produced by biotechnology is –
ECG records
Which one of these is believed to have first made use of fire for hunting, cooking and protection?
Gymnosperms are also called soft wood spermatophytes because they lack :
Which of the following character is not found in all the chordates ?
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Solution
Diaphragm is not found in all the chordates
A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this:
1.Lots of urea and phosphate fertilizer were used in the crops in the vicinity
2.The area was sprayed with DDT by an aircraft
3.The lake water turned green and stinky
4.Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.Which two of the above were the main causes of fish mortality in the lake?
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Solution
Lots of urea and phosphate fertilizer were used in the crops in the vicinity and the lake water turned green and stinky.Due to this, lake near a village suffered heavy mortality of fishes within a few days.
Cirrhosis of liver is caused by the chronic intake of:
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Solution
Long term intake of alcohol causes damage to liver which is known as cirrhosis of liver with continued alcohol intake, there is destruction of hepatocytes and fibroblasts(cell which form fibres) and slimulaties of collagen protein formation.
Palisade parenchyma is absent in leaves of:
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Solution
Palisade parenchyma is absent in leaves of Sorghum. It is a leaf tissue composed of columnar cells containing numerous chloroplasts in which the long axis of each cell is perpendicular to the leaf surface. The palisade parenchyma is usually directly beneath the epidermis of the upper surface of the leaf. The cells of the palisade parenchyma are cylindrical. Neighbouring cells look like the stakes of a palisade. Cells of the palisade parenchyma contain three to five times as many chloroplasts as those of the spongy parenchyma. The chloroplasts stay usually near the cell’s wall, since this adjustment guarantees optimal use of light.
Checking of re-radiating heat by atmospheric dust, O3, CO2 and water vapour is –
ATP is
Epidermis consists of ___________ and is __________(layered)––
All of the following statements concerning pregnancy are accurate EXCEPT
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Solution
The high levels of estrogen and progesterone in the maternal circulation during pregnancy inhibit the cyclic release of pituitary gonadotropins and prevent the menstrual cycles. Pregnancy hormones include HCG, which maintains the corpus luteum of pregnancy and forms the basis for pregnancy diagnosis urine tests. Ovarian and placental estrogen and progesterone, human placental lactogen, and pituitary prolactin stimulate development of the ducts and alveoli in the mammary glands.
Matrix of cartilage is secreted by –
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Solution
Matrix of cartilage is secreted by Chondroblasts.
In case of natural selection when more individuals acquire the peripheral character value at both ends of the distribution curve. The selection is called
One of the free -living, anaerobic nitrogen – fixeris:
Which of the following birth control measures can be considered as the safest?
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Solution
Sterilization techniques can be considered as the safest birth control measures. It provides a permanent and sure birth control. It is called vasectomy in male and tubectomy in female.
The thallus of Volvox is called
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Solution
Volvox is a hollow ball like colony with a fixed number of cells is called coenobium.
Lactose operon produces enzymes