A. So as to prevent oxygenated blood from mixing with deoxygenated blood birds and mammals have four chambered hearts.
B. Amphibians and some reptiles tolerate some mixing of oxygenated and deoxygenated blood and therefore have three-chambered hearts.
C. Fishes have only two chambered hearts as here blood is pumped to gills to get oxygenated which then pass to the rest of the body.
1. A and B are correct
2. B and C are correct
3. A and C are correct
4. A,B and C are correct
Answer 4
2. Some marine animals and insects emit light from their body in darkness. This phenomenon is known as:
1. Phosphorescence
2. Bioluminescence
3. Both 1 and 2
4. None of these
Answer 2
3. The sweet taste of fruits is due to
1. Lactose
2. Fructose
3. Maltose
4. Ribose
Answer 2
4. Which among the following statements is correct?
1. Prokaryotic cell possess nucleus
2. Cell membrane is present both in plant and animal cells
3. Mitochondria and Chloroplasts are not found in eukaryotic cells
4. Ribosomes are present in eukaryotic cells only
Answer 2
5. Consider the following
Leaf Shape Resemblance
A.Lance-like i. Like sharp points
B.Palmate ii. Like football
C.Toothed iii.Like palm of a hand
D.Oval iv.Like spread head
A B C D
1. 4 2 3 1
2. 4 3 1 2
3. 3 1 2 4
4. 3 4 1 2
Answer 2
6. Interregnal necrotic spots on leaves appear due to
1. HF injury
2. SO, injury
3. NO, injury
4. O3, injury
Answer - 2
7. Lichens, which are capable of initiating ecological succession even on a bare rock,are actually a symbiotic association of -
1. Algae and Bacteria
2. Algae and Fungi
3. Bacteria and Fungi
4. Fungi and Mosses
Answer 2
8. Consider the following the phenomenon of hibernation can be observed in which of the above kinds of animals?
A. Bats
B. Bears
C. Rodents
1. A and B only
2. B only
3. A, B and C
4. Hibernation cannot be observed in anyone of the above
Answer 3
9. Which of the following biologists/scientists classified all living organisms into five main kingdoms?
1. Carl Litaker
2. Marks Haynes
3. R.H. Whittaker
4. S Stewart
Answer 3
10. Which of the following are essential whorls of the flowers?
1. Sepal and Petal
2. Sepal and Tepal
3. Androceium and Gynoecium
4. Calyx and Stamens
Answer 3
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