Thursday, October 29, 2020

2018 March | HSE +1 Exam | Botany Question Paper

2018 MARCH (+1) 
PART A: BOTANY

Answer all questions from questions numbers 1 to 4. Each carries one score. (4 x 1 = 4)

1) Fill in the blank.

In Anabaena, specialized cells called…………. help in nitrogen fixation.

2) There are different types of leucoplasts in plant cells. Name the leucoplast that store proteins.

3) Observe the relationship between the first two terms and fill in the blank.

Epipetalous stamen – Brinjal ………… – Lily

4) Choose the correct answer from the bracket.

First stable product of carbon dioxide fixation in C4 plant is ………. (PGA, OAA, PEP, RUBP)

Answer any seven from questions numbers 5 to 13. Each carries two score. (4 x 1 = 4)

5) Match the following: 

A

B

a)      Calotropis

i)        Vexillary

b)      China rose

ii)      Valvate

c)      Cassia

iii)    Twisted

d)      Pea

iv)    Imbricate


6) Complete the flowchart given below. 


7) Ribosomes are organelles without a membrane found in all cells. Name another organelle devoid of membrane, seen in animal cells. Write its function.

8) Plants are adversely affected by manganese toxicity. Mention the effects of manganese toxicity in plants.

9) Following figure shows the citric acid cycle. 


Identify the steps where FADH2 and GTP are synthesized.

10) The given figure shows a plant belonging to liverworts. 


Identify the plant.
Name the asexual buds seen on it and write their features.

11) State any four features of facilitated diffusion.

12) Write a note on the phenomenon plasticity exhibited by plants with an example.

13) The breakdown of glucose to pyruvic acid is called glycolysis. Where does it occur in a cell? How many ATP molecules are directly synthesized during this process?

Answer any four from questions numbers 14 to 18. Each carries three score. (4 x 3 = 12)

14) The tissue found between the upper and lower epidermis of a leaf is called mesophyll.

a) Write the type of cells found in this tissue in a dicot leaf.
b) Mention two differences between a dicot leaf and monocot leaf.

15) Photosynthesis is a process influenced by environmental factors as well as plant factors. Mention three factors under each category.

16) First phase of meiosis I is typically longer and complex one. Name it. Mention the five subdivisions of this Phase.

17) Plant growth regulators can be employed for various agricultural and horticultural practices. Identify the growth regulators that can be used following purposes.

a) To have weed free lawns
b) To increase sugarcane length
c) Fruit set in pineapples
d) Rooting in stem cuttings
e) Inhibiting seed germination
f) To promote female flowers in cucumber

18) Certain stages in cell cycle are given below.

Karyokinesis, prophase, cytokinesis, metaphase, anaphase, telophase. 

      Choose the statements (from those given below) that match with these stages and prepare a table.
  • Centromere split and chromosomes move to opposite poles.
  • Chromosomes cluster at opposite poles and nuclear envelope assembles around.
  • Chromosomes seems to be with two chromatids attached at centromere.
  • Chromosomes arranged at spindle equator.
  • Separation of daughter chromosomes.
  • Division of cytoplasm.

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