Biology PYQ — Page 2

Consider the following organisms: 1. Agaricus 2. Nostoc 3. Spirogyra Which of the above is/are used as biofertilizer/biofertilizers?

Consider the following minerals: 1. Calcium 2. Iron 3. Sodium Which of the minerals given above is/are required by human body for the contraction of muscles?

Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to 1. resist drought and increase absorptive area 2. tolerate extremes of pH 3. resist disease infestation Select the correct answer using the codes given below.

Many transplanted seedlings do not grow because

Fruits stored in a cold chamber exhibit longer storage life because

Consider the following kinds of organisms: 1. Bacteria 2. Fungi 3. Flowering plants Some species of which of the above kinds of organisms are employed as biopesticides?

Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

Consider the following kinds of organisms: 1. Bat 2. Bee 3. Bird Which of the above is/are pollinating agent/agents?

A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is

A company marketing food products advertises that its items do not contain trans-fats. What does this campaign signify to the customers ? 1. The food products are not made out of hydrogenated oils. 2. The food products are not made out of animal fats/oils. 3. The oils used are not likely to damage the cardiovascular health of the consumers. Which of the statements given above is/are correct ?

When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because

Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants. How do antioxidants help a person maintain health and promote longevity ?

Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition?

Widespread resistance of malarial parasite to drugs like chloroquine has prompted attempts to develop malarial vaccine to combat malaria. Why is it difficult to develop an effective malaria vaccine?

Some species of plants are insectivorous. Why?

Consider the following statements: 1. Sweet orangà plant is propagated by grafting technique. 2. Jasmine plant is propagated by layering technique. Which of the statements given above is/are correct?

Consider the following statements about probiotic food: 1. Probiotic food contains live bacteria which are considered beneficial to humans. 2. Probiotic food helps in maintaining gut flora. Which of the statements given above is/are correct?

Assertion (A): In human body, liver has important role in fat digestion. Reason (R): Liver produces two important fat-digesting enzymes.

In which of the following kinds of organisms is the phenomenon found wherein the female kills the male after copulation?

Whit is the pH level of blood of a normal person?

Among the following, which one lays eggs and does not produce young ones directly?

Among the following, which one is not an ape?

Which one of the following is the correct sequence in the order of decreasing length of the three structural parts given below of small intestine in the human body?

In human body, which one of the following hormones regulates blood calcium and phosphate?